WVGunman
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- Feb 26, 2014
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So that would mean the smaller the caliber the more it would gain from a longer barrel? That matches what I've seen.
.45 ACP Loads for Carbines
- Thread starter GarandMan94
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gotboostvr
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Yup, generally speaking. It's a more apples to apples comparison with bottle necked cartridges since they (358Win & 243Win for example) have similar case capacities and operating pressures.
Toprudder
Member
I will throw in an interesting experience I had loading straight wall 357mag for both a 5" revolver and a 16" rifle.
A while back, I picked up a pound of 300-MP to try. I noticed it had significantly higher velocities in the published load data than the other magnum powders. However, when I worked up loads to test in my 5" GP100, I did not see higher velocities than 2400 or H110. And, working up in charge level, the velocity peaked at 1200fps and did not increase AT ALL starting at ~ 2.0gn below max charge. That last 2.0gn range all were ~ 1200 fps. (158gn XTP/mag bullets). I was confused by that.
A few months later, I picked up a 16" Rossi rifle, and thought I would give 300-MP another try. This time, the velocity increased all the way through the charge range, right up to the max. The most accurate load was about 0.6gn below max charge, which gave me 1800fps. This is > 200fps faster than 2400.
I went back and tried to understand the published load data, and Alliant had published numbers shot from a 10" barrel. Hornady I believe had used an 8" barrel. Evidently, 300-MP works great in long barrels, but has no advantage in short barrels.
A while back, I picked up a pound of 300-MP to try. I noticed it had significantly higher velocities in the published load data than the other magnum powders. However, when I worked up loads to test in my 5" GP100, I did not see higher velocities than 2400 or H110. And, working up in charge level, the velocity peaked at 1200fps and did not increase AT ALL starting at ~ 2.0gn below max charge. That last 2.0gn range all were ~ 1200 fps. (158gn XTP/mag bullets). I was confused by that.
A few months later, I picked up a 16" Rossi rifle, and thought I would give 300-MP another try. This time, the velocity increased all the way through the charge range, right up to the max. The most accurate load was about 0.6gn below max charge, which gave me 1800fps. This is > 200fps faster than 2400.
I went back and tried to understand the published load data, and Alliant had published numbers shot from a 10" barrel. Hornady I believe had used an 8" barrel. Evidently, 300-MP works great in long barrels, but has no advantage in short barrels.
I find that interesting. I recently got a Ruger 77/357 and have some loads worked up with 300MP. Looking forward to see how they do once the weather breaks.
Mr.Revolverguy
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A heavy but saami spec load with HS-6 is what you are looking for. I use it in the "Chicago Typewriter" Thompson.
I've taken a liking to the IMR red for my 45acp loading. I have been running a powdercoated lee 230gr bullet I all my 45acp pistols and carbines. I run it at the middle of the stated load from Hodgdon's zite data. I have ran it at max charge out of my carbines and it's very nice as well. The IMR red is really a good value. I pay less than $16 a lb here in Missouri.
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