Velocity Loss With Shorter Barrels

Viral_SIGness

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That’s not much of a velocity loss even if it was a 22 to an 18? Wonder why with the .243 going from a 22” to an 18” the velocity loss is so much greater?
I used to believe the larger the bore, the more efficient. Since these tests, I have no clue what's going on lol I "believe", a .338 Federal would be more efficient than the .308, and a .358 Win would be more efficient than the .338 Fed.
 

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I used to believe the larger the bore, the more efficient. Since these tests, I have no clue what's going on lol I "believe", a .338 Federal would be more efficient than the .308, and a .358 Win would be more efficient than the .338 Fed.
I don’t know what’s going on either, but it’s certainly an interesting topic and testing results that blows everything I was led to believe out of the water! But, I think there may be more unidentified variables involved, since OPs here are reporting different results? Just don’t know?
 

Viral_SIGness

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I don’t know what’s going on either, but it’s certainly an interesting topic and testing results that blows everything I was led to believe out of the water! But, I think there may be more unidentified variables involved, since OPs here are reporting different results? Just don’t know?
I hope by getting my hands on RL17, I can show bigger velocity windows between the Alaskan and African.
 

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I can't help but wonder if it is due to one of three possibilities. 1) The modern powders burn more efficiently so require less barrel length. 2) Back then they were aware of the minimal loss but wanted to wring every last foot of velocity out of the cartridge for sales purposes. 3) They wanted to keep the blast and sound down as much as possible.

Re the Rigby. I use AR2209 (IMR4530, H4350) with 96 grains. AR2213SC (H4831) use 10 grains more powder to get same velocity. I figure the AR2209, the faster of the two, should burn all in the 22" or hope it would. However I'll live with the longer barrel for resale purposes. Figure I have about 5 more years with it.
I just took this pic from my Hornady manual. Either your loading your Rigby over max or my manual is too conservative?

E69065DE-A539-446A-95D1-C16B58D8B1E7.jpeg
 
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Rule 303

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I don’t have any 4350, but I’ll have to buy some eventually. Everything else I have (W748, RL 15, H335) I use in my .416 Taylor, .458WM and Lott and I guess it’s too fast for the Rigby?
Rl15 should be useable but with a lot of research and caution. I have used AR2206H (H4895, IMR4895) in my Rigby. NOTE this was with cast bullets and I obtained the info from a mate who ran different loads through the Quick Load program.
 

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I just took this pic from my Hornady manual. Either your loading your Rigby over max or my manual is too conservative?

View attachment 391204
These would, I suspect, be in a fast barrel. My manuals say the 4350 powders 94 grains for 2450fps, remembering AR2209, H4350 and IMR4350 are the same powder, manufactured in Aust as AR2209 and sold as the 4350 powders in the US. The 4831's are AR2213sc.

A point of interest is I use the same load for 400 and 410 grain soft nose for 2450fps and for the 400grain Woodleigh Hydrostatic solids but get 2550 fps for the Hydros. All have the same point of impact at 50 and 100mts.
 

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That particular 308 of mine-I have sold that one- would get 2680fps with a 150 grain projectile and very flat primers and sticky bolt lift. I now have a Browning XBolt and Steyr Scout in 308. Yet to velocity test in the Steyr. The Xbolt is very close to those figures with a 155 grain projectile.

Another point of influence on MZ is the actual bullet. The ADI reloading manual (AR Powders) lists results for different bullets in the same weights. They do have different charge weights but that appears to be to get the MV's as close as possible. They do not do this for all cartridges. So I end up wondering if a different bullet may show a greater or less velocity loss.
 

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CoElkHunter

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Hodgdon says 96gr max with a 400

View attachment 391293
That’s a big jump from Hornady’s H4350 @ 90.5gr max and Hodgon’s 96gr max? If/when I can ever find some H4350 I think I’ll start with a milder charge and go up from there? Might have to use some filler to keep the powder against the primer when the massive case is horizontal in the magazine and chamber?
 

Viral_SIGness

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That’s a big jump from Hornady’s H4350 @ 90.5gr max and Hodgon’s 96gr max? If/when I can ever find some H4350 I think I’ll start with a milder charge and go up from there? Might have to use some filler to keep the powder against the primer when the massive case is horizontal in the magazine and chamber?
I have some IMR4350, and (in my .375 Ruger) I couldn't get a 300gr TSX seated on 79 grains. The bullet pushes back out. I have no earthly idea how'd you get 96 grains in it.
 

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I have some IMR4350, and (in my .375 Ruger) I couldn't get a 300gr TSX seated on 79 grains. The bullet pushes back out. I have no earthly idea how'd you get 96 grains in it.
Yeah, I don’t know? I load my .416 Taylor with 70.5gr of RL15 for a moderate load. I think 74gr is max.
 

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That’s a big jump from Hornady’s H4350 @ 90.5gr max and Hodgon’s 96gr max? If/when I can ever find some H4350 I think I’ll start with a milder charge and go up from there? Might have to use some filler to keep the powder against the primer when the massive case is horizontal in the magazine and chamber?

That’s a big jump from Hornady’s H4350 @ 90.5gr max and Hodgon’s 96gr max? If/when I can ever find some H4350 I think I’ll start with a milder charge and go up from there? Might have to use some filler to keep the powder against the primer when the massive case is horizontal in the magazine and chamber?
In the Rigby case 96 grains AR2209 is a conservative load. You can load it up to near 416 Weatherby velocities with about 110grains of AR2209 or 120 grains of the AR2213SC. However my shoulder agrees with the rest of me that the 96 grains of AR2209 will do nicely. :Happy: I started with the ADI recommended min of 89 grains of AR2209 and no need for a filler, use magnum rifle primers. From memory I was getting just below book velocities about 2300fps.

The 416 Rem, Taylor can match the Rigby standard velocities but with way less powder and different types of powder as those cases are based on the 375H&H case.

In the 375 Ruger try Varget (AR2208). Less powder (71 grains)for same MV so might be able to seat monometal projectiles in far enough.
 

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