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" Loads for many cartridges have been reduced not because of an excess of caution but because more accurate pressure testing equipment has become available. Some published loads were found to be excessive when more accurate measurements were made. My own approach to loading the 7x57, in a...

I have two. A Deluxe .225 Win of 1964 vintage and a 300 Win vintage of 1970, since converted to .358 Norma. Both are excellent rifles.

63 grains of IMR4350 is two grains less than the maximum load in the Nosler Manual. You might try increasing the powder charge slightly. Modern powders tend to burn more consistently at 60,000 to 65,000 psi. I have produced very accurate loads in my 300 H&H with several bullets and powders...

The best loads in my Ruger 96/44 lever action, for 240 grain jacketed or 250 grain cast bullets, used Hodgdon Lil' Gun powder. Velocity and accuracy were far better than with H110. The only primer tried was the Winchester WLP "Large Pistol for Standard or Magnum loads".

The Internet Movie Firearm Database (www.imfdb.org) identifies the firearms used in a great many movies.

The .30-'06 does very well with a number of powders and 180 gn bullets. I have had excellent results with IMR4350 (of course), Hunter, Reloder 26, StaBall 6.5, N560, and H4350. My favorite is a load from Alliant data: 180 Nosler Partition and 56 grains of Reloder 16. Since I live in Montana...

Fine looking rifle. I had one just like it i .375 H&H and two friends had them in .338. In each case the stock split behind the magazine after a few rounds. The recoil lug was not supported by any wood but just the cross bolt. The lower edge of the recoil lug bore on the upper curve of the cross...

I have had good results with 250 Accubonds and 62.5 gn Varget and 286 Partitions with 66 gn Big Game. The point of impact of the 250s is about 5 inches higher than the 286s. Have some of each loaded with AR-Comp but haven't shot them yet.

I had a 5" Model B back i the '90s. It was very accurate and reliable. 125 grain factory ammuition chronographed at 1525 fps and it worked great with 158 grain hard cast bullets. I sold it only because Coonan began advertising a .41 Magnum version and i wanted to have some ready cash when it...

Model 70 Lightweight 22" barrel. 145 LRX worked up to 2930 fps with StaBall 6.5. 150 Nosler Ballistic Tip or Partition worked up to 2830 fps with StaBall 6.5 or Reloder 26. Have yet to try other bullets but these should do.

The only published data I could find for Vihtavuori powders in the .416 Ruger: 400 grain Hornady - 71.3 grains N140 - 2150 fps (Hornady Manual #11) By my calculations 73 grains should be a safe starting point for 350 grain bullets, with a maximum of 76 grains. 350 grain Speer - 81.6 grains N540...

I tried R16 in the very similar 9.3x66/370 SAKO and found that with the case filled to the neck a 286 Nosler Partition reached 2415 fps with good accuracy. I would expect a similar result in the 9.3x62 since it has only 4% less case volume. With the 285 gn Lapua Mega the same load reached 2470...

"A few years ago my friend Charlie Sisk, the well-known custom riflesmith from Texas, built a heavy-barreled .300 H&H and shot the rifle with half-a-dozen handloads in his indoor range. He then rechambered the same barrel for the .300 WSM and tried the same powders and bullets. Muzzle velocities...

Since the 300 H&H and 300 WSM are very nearly identical in case capacity I have been using 300 WSM data successfully. The Hodgdon 2021 manual has the following for 300 WSM and Varget, Winchester cases and WRM primers. 150 Speer GDSP 55.0 Varget 3008 fps 56800 psi...

Much like crs I lengthened the chamber of a .405 Winchester. Mine was a Ruger #1 and I was able to lengthen the chamber by .28", still leaving .25" of the bullet inside the case. The result were 300 gn TSX at 2550 fps and 400 gn Woodleigh (.411") at 2150 fps. The accuracy with factory length...

R22 (62 gn-215 primer) gave great accuracy with 168 gn Sierra BTHPs at 2770 from a 22" barrel. Only got 2820 from 168TTSX with a case full of R22 from a 20" bbl. Got around 2900 with H4350 or R16. In the '06 I like 200 Accubonds or Partitions with R26 or StaBall 6.5 for a bit over 2600. R26...

Of the powders you mentioned I would choose Varget since it is designed to to "temperature stable". Pressure, and hence velocity, will vary less with temperature change than with IMR4895. I have not, personally, used used Varget in the '06 since there are many powders which are more suitable...

Hodgdon's burning rate chart puts it between H4350 and H4831. This matches my experience with 7x57, .30-06 and .300 H&H but in the .358 Norma it seems faster than H4350. Closer to Big Game. An example of burning rate charts being rather vague guidelines and that burning rates can vary...

I found StaBall 6.5 to work well in the 7x57, .30-06, .300 H&H and .358 Norma. It contains a copper fouling reducing chemical which reacts with copper in the bore and converts it to a dirty-looking residue which is ejected from the barrel with the next shot. This can easily be mistaken for...

Try switching primers. In my experience magnum primers are more consistent with spherical powders than standard primers, even in small cases. Many modern powders burn most consistently at around 60,000 psi. Working up toward the maximum published load could be beneficial.

Model 70 Lightweight Super grade with 1:9" twist. I will try some 160 grain bullets when I find them.

I have just begun working with the 7x57 in a Model 70 of recent manufacture. Due to the current shortage of components only 150 gn Sierras and 145 gn Barnes LRX have been tried so far. Have not had good groups with the Sierras but the Barnes have been outstanding. I suspect the Sierras may do...

My .416 Howell (an old wildcat which is based on a shortened .404 Jeffery) has a case capacity nearly identical to the .416 Ruger. I prefer powders designed to be relatively insensitive to temperature changes. It works very well with Varget, Ramshot TAC, 8208XBR or AR-Comp. Normally 350 grain...

Have a read of Factors In Accuracy part one and part two at a link which is not to be mentioned on this forum but may be findable with a search of the internet. Author John Barsness has applied scientific methodology to handloading. He is the author of The Big Book of Gun Gack in three volumes...

In my opinion, yes. It seems likely that is the reason for the lack of published data, while there is data for powders of similar burning rate. Experiment could prove my opinion wrong but I no longer have a .375 to play with, relying on a 6.3x66 and a .416 instead.

N550 is very dense compared to R16. Filling the same cartridge case to the top 102.9 grains of N550 would fit vs 91.4 grains of R16

I have been unable to find any published data. Adding up the facts: IMR 4350 and R16 have similar burning rates, IMR 4530 requires compressed powder charges and R16 is quite a bit less dense than IMR 4350. I conclude that one would be unable to stuff enough R16 into a .375 H&H case to get...

Using a RCBS Case Master tool I got the following neck thickness measurements: New Hornady .300 H&H - .012 to .013" New Norma .300 H&H - .012" Winchester .300 H&H formed from .375 H&H - .013 to .014" Probably not a problem unless you have a particularly tight chamber. fourfive8 wrote a post...

I just tried sizing a .375 H&H case, which has been fired several times, in a .300 H&H die. A normal amount of lubricant was applied by rolling the case on a case-lube pad.. The sizing did not require great effort and the case formed perfectly. The length of the case increased by .025". My...

Reloder 16 has a burning rate similar to the 4350s. I would use IMR4350 or H4350 starting loads and work up from there. Starting loads from the Hodgdon manual: about 78gn for 270 gn bullets and about 75gn for 300gn. 235gn bullets will need a faster-burning powder. Reloder 16 is less dense than...

My .416 has a much shorter neck than the 404 and I have never seen a bullet set back despite leaving a cartridge in the magazine while firing 10 rounds. The rifle weighs a bit over nine pounds. If your expander ball is .001" to .002" smaller than bullet diameter I predict you will have no...

IMR 4451 is also a viable substitute. It is temperature stable, has a copper fouling reducer and is very close in burning rate to the 4350s. Once again, check Hodgdon for data. Reloder 16 is also very close in burning rate but is less dense so you might not be able to squish enough into a case...

Nosler Partitions generally penetrate deeper than Accubonds of the same weight since they do not expand as wide. You might consider 175 Partitions as well.

Ask Hornady if they can use a chamber cast instead of fired cases. Then have a gunsmith make a cast or get some Cerrosafe and make one yourself.

I like 1911s a lot and at present have one in .38 Super. Got lonesome for a .45 and found a Beretta Px4 Storm on sale. It is light in weight and the trigger is remarkable. The double-action pull is light, smooth and even all the way. I shot a few inches low with ball ammo so it got an...

For the cartridges listed in the OP I would use magnum primers. For smaller cartridges using ball powders magnum primers often give better accuracy. For instance my .220 Swift does much better with magnum primers when using 760, Hunter or Big Game. Recently an '06 produced much better groups...

My #1 does well with H4831sc and 168 or 180 TSX. Magnum is preferred for 180 TSX, 200 Accubond or 200 Partitions. Reloder 22 was very good but replaced it with VV-N560 for slightly better groups. Magnum produces higher velocity than the others mentioned, is less sensitive to temperature and...

I have .416 Howell, an old wildcat based on a shortened .404 Jeffery case. Have measured the overall length of a number of cartridges that were left in the magazine while four shots were fired and none of the bullets moved in the slightest. Do some testing before going to the bother of...

I used to use R22 with 200 gn bullets in the .300 Win Mag and had no problems but never tried it in very high temperatures. Switched to N560 which produced slightly better accuracy and, interestingly, gave nearly identical velocity as the same charge of R22. Now use Ramshot Magnum due to...

Hunter gave very good accuracy and velocity with 180 gn bullets in the .30-06 and .300 H&H. Burning speed about like IMR4831. Use magnum primers. Poor accuracy in 220 Swift and 358 Norma.

My .416 Howell (an old wildcat similar in capacity to the .416 Ruger) with H414/760 had a velocity variation of 100 fps between 45 deg. F and 80 deg F. This adds up to 2.85 fps per degree F and I would expect that amount of variation to increase above 80 degrees F. Temperature sensitivity of a...

Don't have much experience with H4831 but I have found that Hunter, H4350, IMR4451, Reloder 16 and Reloder 26 all work very well with 180 gn bullets. H4350, IMR4451 and Reloder 16 are likely the least temperature sensitive. Reloder 26 has been very accurate with 200 gn bullets and, because...

I once had a .50-70 sizing die crack when I used it without first cleaning it. Now I wipe then out with a patch and a little solvent on a cleaning rod. An occasional cleaning can prevent a buildup of crud which can scratch the dies. To prevent scratches in the neck portion of the dies I now...

The 4831 in Ackley's manual would be military surplus from WWII. Its burning rate is reportedly slower than the modern H4831. IMR4831 has a burning rate between H4350 an H4831.

I quite like AVs but only after some preventive maintenance. I have seen stocks split on four of them, two .375s and two .338s. The recoil lugs, in the examples I saw, were supported only by the cross bolt through the stock. The cross bolt has a flat milled on to it to give better contact with...

I had a .375 Ackley Improved a long time ago. I don't recall any specific data but the the velocity increase over the H&H was miniscule. The data in PO.'s Handbook was way too hot. The first load I tried with IMR4350 was 5 grains below the maximum load listed and still blew the primer plumb...

I just recalled that the Nosler Reloading Guide 8 has data for the 9.3x64. The following used RWS cases, Rem. 9 1/2M primers in a 25" barrel. IMR 4350-76.0 gn @ 2690 fps (max) 74.0 gn @ 2621 fps 72.0 gn @ 2551 fps (most accurate with this powder) Reloder...

My box of Lapua bullets says 18.5 gram/285 grains. 18.5 grams is, more accurately, 285.49867 grains so rounding it off either way is close enough for me. According to Cartridges of the World 14th Edition: 286 SP IMR 4350 76.0 grains 2725 fps Data Source: RWS Reducing the IMR...

I am not aware of any published Ramshot data for either cartridge. They do not appear in the new Western Powders Loading Guide. In my .358 Norma with a 24 inch barrel (Federal 215 primers) I worked up to 70 gn of Big Game with a 250 gn Nosler Partition for a little over 2700 fps and an...

In my .358 Norma Reloder 15 worked well with 225 gn bullets but accuracy was poor with 250 gn. The best results with 250, 280 and 310 gn bullets came with H4350 with IMR4451 a close second. Big Game looks promising with 250 gn but I have not finished working up loads. Big Game is quite dense...