375 HH double question

mms45

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why if 375 HH is considered bad for a double do you see so many out there. It seems like at this point it might actually be one of the most prevalent double rifle calibers ever chambered. You see it from the top makers HH, Purdey, heym ect you see it in English guns, German, and Austrian . It spans from old guns all the way up to new guns in all categories from 11k chapuis to 250k best sidelock. Is the 375 hh rimless problem overblown? is the difference in pressure a real issue?

Or is it more of a " this could be and issue" therefore the internet has been deemed wrong?

I seem to recall the chapuis rep on here posting in the big iphisi thread that they have never had a 375hh returned for an issue.
 
it's not so much rimless are 'Bad' for a double. or not functional.
The timeless Rimmed version with its simplicity are desirable, traditional, peerless, unsurpassable and perfect. nothing more nothing less.
 
I also don’t know that the 375HH was “actually be one of the most prevalent double rifle calibers ever chambered.” I’d bet not…but it is one most often seen in today’s market, in part because they seem to languish unsold while proper rimmed cartridges from similar makers pop up and sell more quickly.

The rimless requires additional, small, moving parts and ones that historically were prone to premature wear and require attention/replacement. That doesn’t mean that the rifle will absolutely fail, and may not even ever require attention at all, but it is an unnecessary failure point that is dispensed with altogether if using a rimmed cartridge.

Having a 375 Flanged Mag I can say it’s awesome.
 
I'm not a fan of rimless catridges to be used in doubles or any other break-downs and would not buy one. However, there is one good point to use a rimless .375 in a double and that's good availability of ammo in Africa.
 
Good point maybe it’s the same rifles sitting but man sure seems to be a lot of them.
As much as I love the 375 Flanged Mag and prefer against the rimless H&H version, the one wonderful thing about the less favored H&H version is at times you can get a true deal on one, maybe step into a rifle you’d never want to pay for if it were in a proper double cartridge.

Heyms are a good example, where you’d see the H&H versions come up and languish at 30-50% the price of a 450/400 or 470. I’ve seen a couple Holland and Holland Royals in 375 H&H at nice discounts and makes me pause and think. Just like odd-ball cartridges by today’s ammo/brass availability, there are potential headaches, but discounts on the flip side as well. BUT…you have the expect the same if you ever decide to part with the rifle yourself. Expect it to take additional time and discount to move it.
 
As much as I love the 375 Flanged Mag and prefer against the rimless H&H version, the one wonderful thing about the less favored H&H version is at times you can get a true deal on one, maybe step into a rifle you’d never want to pay for if it were in a proper double cartridge.

Heyms are a good example, where you’d see the H&H versions come up and languish at 30-50% the price of a 450/400 or 470. I’ve seen a couple Holland and Holland Royals in 375 H&H at nice discounts and makes me pause and think. Just like odd-ball cartridges by today’s ammo/brass availability, there are potential headaches, but discounts on the flip side as well. BUT…you have the expect the same if you ever decide to part with the rifle yourself. Expect it to take additional time and discount to move it.
Honestly that is what’s made me ask the question there are some truly nice rifles I would never be able to afford in 470 ect….. but 375 puts it in the realm of possibilities
 
I’m not sure there are too many highly discounted good H&H 375 flanged magnum Royal double rifles getting around . The cartridge is superb with the 300 grain pill . And the Royal is a wonderful rifle . I use mine regularly and it works wonderfully well on buffalo . Every bit as good as my 375 H&H belted rimless magnum bolt action . Great cartridge and a great rifle .
 

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I’m not sure there are too many highly discounted good H&H 375 flanged magnum Royal double rifles getting around . The cartridge is superb with the 300 grain pill . And the Royal is a wonderful rifle . I use mine regularly and it works wonderfully well on buffalo . Every bit as good as my 375 H&H belted rimless magnum bolt action . Great cartridge and a great rifle .
Beautiful rifle! From what I see the flanged goes for 15-20k more than the HH
 
why if 375 HH is considered bad for a double do you see so many out there. It seems like at this point it might actually be one of the most prevalent double rifle calibers ever chambered. You see it from the top makers HH, Purdey, heym ect you see it in English guns, German, and Austrian . It spans from old guns all the way up to new guns in all categories from 11k chapuis to 250k best sidelock. Is the 375 hh rimless problem overblown? is the difference in pressure a real issue?

Or is it more of a " this could be and issue" therefore the internet has been deemed wrong?

I seem to recall the chapuis rep on here posting in the big iphisi thread that they have never had a 375hh returned for an issue.

While rimless, high pressure cartridges like the 375 H&H Magnum (rimless) are better suited for a bolt action, there are certainly plenty of double rifles chambered for it. The factors that make these not ideal include,
  • Bolt Thrust - https://en.wikipedia.org/wiki/Bolt_thrust
    • Simply Bolt Thrust is calculated by the cross sectional area of the largest point of the interior of the cartridge case, multiplied by the maximum (peak) chamber pressure of the cartridge.
  • Peak Pressure:
    • 375 H&H Rimless has a Maximum Pressure of 62,000 psi
    • Rimless cartridges such as the 375 Rimless operate at around 40,000 psi
  • Clearly at 50% more pressure each and every shot, rimless break action rifles will become loose much sooner than their rimless cousins. It’s that simple.
  • Pawl extractors – The spring loaded mechanical tabs that extend into the rim of rimless cases to provide the means of extraction are named “pawls”.
    • My Heym .458 Win (rimless) has two per extractor and at least once ripped the rim off a stuck case.
    • I’ve owned Merkel and Chapuis doubles that functioned with one pawl per extractor. I never shot those rifles enough to wear out those mechanisms.
Bonus: Diggory Hadoke on 375 Rimless, https://www.vintageguns.co.uk/magazine/the-375-flanged-double

How long will a high pressure, rimless double rifle last before it needs a repair? Let’s think about this.
  • Good quality bolt action rifles which are properly cleaned can last 5,000 rounds before the throat of the rifling is worn out, contributing to loss of accuracy.
    • In most cases, the actions will be almost as good as new! Just re-barrel, or set the barrel back by taking off in in at the breech and muzzle, and rechambering and re-threading. This would be fiscally impossible for a break action double rifle!
    • Note: Magnum cartridges with excessive powder for the size of the bore such as the .220 Swift, .264 Win Mag and others can “shoot out” their barrels in 1,000 rounds!
  • How many rounds do most shooter launch from their hunting rifles in a lifetime? Think about this.
    • Heavy recoiling rifles from 375 H&H and up do not get shot 1,000 in several decades.
    • Double rifles in 375 and larger probable get shot less than most bolt action rifles.
  • If any double rifle is shot enough to loosen the action, the rifle can be repaired can be repaired by a competent gunsmith, if you can find one! The process is to,
    • Remove the action hinge pin,
    • Machine a slightly larger diameter pin and insert into the action,
    • Mil the barrel hook to fit the new pin.
    • There is a lot of smoke blackening and hand filling to properly fit a new hinge pin to the barrel hook.
    • This is a common practice for 100+ year old vintage side by side shotguns.
If considering any rimless double, examine the action with a automotive feeler gage.
  • If the action can close on a .002” gage on the top and side interfaces of the barrel and breech, it has some wear but is serviceable (according to JJ Perodeau).
  • If an action cannot fully close on a .001” feeler gage, that rifle is barely broken in.
  • Warning: Once any SxS action has side to side wear as identified by a feeler gage, it will loosen faster due to side to side "hammering" generated by each shot!
A good quality 375 H&H double rifle while not ideal should give a caretaker much enjoyment before it needs a visit to a competent gunsmith. Could tightening an action change the rifle's regulation? In theory, yes! How much would it affect regulation? Perhaps a little.

The bottom line is there are many serviceable rimless doubles on the market. Their price should reflect they are not chambered in the more ideal, low pressure cartridges. How much of a price differential should there be? That’s a good question but a high quality rifle such as a Heym or better should fetch a higher percentage of price than middle grades such as Merkel. I’ve owned both… Finally, I would not touch a low quality double in any rimless chambering!

Personally, I've owned six double rifles and am down to only two. I need to let one go to its next "caretaker". I love my Heym 88B in .458 Win but also have strong affinity for high quality bolt action magazine dangerous game rifles.

As always, my babbling above is worth as much as you paid for it...
 
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Good point maybe it’s the same rifles sitting but man sure seems to be a lot of them.

They seem everywhere because its the first "Africa Caliber" that comes to mind for a layperson. A person that purchases a double rifle without much knowledge tends to get one and the 375HH models are affordable, thus they buy them.

Then the buyer learns more and realizes they did not buy the right tool for the job. Experienced dangerous game hunters and experienced double rifle owners don't particularly care for the 375HH doubles so they languish on the market for a very long time.

A rimless cartridge requires an ejector mechanism to release the spent brass. Ejectors are a mechanical device that can and will fail. The small spurs on the ejector spur grabs the groove in the belt/rim and is a small protrusion. It is not that difficult to force a rimless cartridge past those spurs jamming the rifle. If you slam the rifle closed thereafter with force, you've broken the ejectors and perhaps gotten yourself killed by dangerous game.

When you do see 375HH doubles that are well regarded, they are a secondary barrel set that came WITH a 450,470, or 500NE double. Those 375HH barrels fit nicely on a large frame, large bore double rifle. The purpose of those 375HH barrels are for plains game without having to bring a second rifle on the hunt. In some cases, the biggest issue is limitation of how many rifles you can import for a hunt with many countries being limited to THREE. A two-barrel double rifle set opens up room for wives/children to have their rifles in the same case without going over the rifle limit.

But no, most people with knowledge do not want a rimless double rifle for dangerous game.
 
I was watching a video of Westley Richard rimless ejectors are very different than the Heym, Chapuis ones that are little paws. They were blades activated by the action not springs. And the rounds could drop into the chamber
 
Greetings mms45,

Good question, thanks for posting it.
In my opinion yes, the belted - rimless risk in double rifles is potential but in my opinion a bit over blown.
I have owned one Merkel SxS in .375 H&H with extractors, one Franz Sodia SxS in .375 H&H with ejectors and one Heym SxS in .458 Winchester, with selector switch (in the forearm) to set on either eject or extract.
Both .375’s were / are the standard original belted rimless variety, not the also quite excellent flanged version.
Never did any of them fail to pull fired cartridges from their chambers, including when training with each, firing multiple rounds through hot barrels.

The potential for malfunction and / or damage to the extractors / ejectors, from closing the rifle after a cartridge has somehow gotten past the pawl mechanism and fully chambered itself, has definitely not been my experience with any of the above mentioned 3 rifles.
Being one who beforehand, always thoroughly rings out any rifle that I intend to hunt with, I have intentionally set up that scenario in all 3 of those rifles, multiple times with each of them.

It requires securing the rifle in a padded cleaning cradle or gunstock checkering vice or to have another person hold the rifle while you tinker around until you have set up the potential malfunction.
I had to hold down the pawls with a very thin strip of sheet metal with one hand while popping the cartridges past their proper place in line with my other hand.
The Heym had two separate pawls per barrel.
It was a little more tedious to get past that excellent design but worth knowing the outcome, before hunting with it.
Anyway, after removing each rifle from the vice, I carefully at first closed the action.
After several times, I would close the action on each rifle with more and more enthusiasm.

Not once in any of those rifles did I experience a malfunction from doing this.
Even with both cartridges placed past the mechanisms and fully chambered flush, the rifles all closed as smooth as though nothing was amiss.
The little spring loaded pawls are beveled on the appropriate side, obviously to skip past the malfunction and pop into the extraction groove like clockwork.
Upon opening each rifle, the mispositioned cartridges were withdrawn properly every single time, fired or still live, either one.

However, high chamber pressure has caused me an annoying issue with a double rifle (the Merkel .375 H&H), that I had bought brand new, in the maker’s leather bound case, with paperwork and test target, clearly indicating that Federal brand 300 gr RNSP ammunition was used to regulate it.
I suspect the right side barrel had a tight throat.
With the specified ammunition, the fired round from that barrel would every time badly flatten the primer, sometimes piercing the primer.
That right side barrel always flattened and sometimes pierced Winchester and Remington factory ammunition primers as well.
When a pierced primer would now and then leave a tiny fragment of primer cup metal (still attached to the pierced primer) bent backward into the firing pin hole, then opening the rifle required great force.

I had to hold the top lever hard to the right while slamming the rifle down over my bent knee, directly at the hinge.
Even with that ridiculous knee bruising activity, never did the little rifle fail to extract, not even once.
There are several rifles exactly like the one I had the pressure problem with, plus other same make rifles in 9.3x74R here in the general area where I live.
I’ve never heard of any of them suffering pressure problems like mine did.

However and after having said all that, I too have always and continue to generally prefer cartridges with a sturdy rim for double rifles, as that seems to me, the “more sure” design for doubles (and single shots too).

Speaking of proper rimmed or flanged cartridges for doubles, the picture attached below is of a very affordable SxS in 9.3x74R, a wonderful hunting cartridge for doubles and single shots.
I’m not saying this pictured rifle is of bespoke quality, just saying it is affordable.
And with that, it never ceases to amaze me (and disappoint me) that such affordable “knockabout” grade double rifles, with appropriate length barrels to fit grownups are virtually never offered in .303 British caliber or in .30-30 Winchester caliber, by any maker these days.
The Merkel I had an issue with is affordable and aside from that one I had, they generally are decent rifles.
For whatever reason, they do not offer it in .303 or .30-30 either one, at least not within their main production line of affordable SxS rifles.
Very likely I’d buy one if they did.
A customer can order one from some of the better makers, beginning around $30,000.to $40,000. US Dollars.
As much as I love rifles, paying $30 Thousand or more USA bucks for one is not a happy thought for me.

Chapuis did almost hit the mark with their sturdy but petit small frame .30-30 double, except for the fact that they made it with miserably way too short of barrel length.
It was affordable though so, perhaps there is a tiny spark of hope for a future offering with somewhat longer barrels some glorious day ?
I think Davide Pedersoli is now making a SxS rifle in the .44 Magnum revolver cartridge.
Again however affordable that it is, it too is sadly barrelled even shorter than the above mentioned already way too short of barrel length Chapuis .30-30 double rifle.

Well anyway, that’s about all I can think of to rant about on this topic.
And so, I will stop here.

Cheers,
Velo Dog.
 

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