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Post by Encore64 on Aug 23, 2019 11:46:29 GMT -5
I'll start off by saying I'm not recommending any loads or ideas to anyone. But, have put a lot of research and study into this suject.
This is the most knowledgeable bunch of Revolver Shooters I know, so I ask?
I continuously read about loading the 38-40 mildly, even in the Blackhawk. There are a few warm loads, but mostly on par with the 10mm.
The base of Starline 38-40 Brass measures .462". Compared to their 45 Colt at .475". This gives some extra strength in itself due to cylinder wall thickness. But, more info available.
My Super Blackhawk 44 Magnum accepts a .458" pin gauge. My 38-40 cylinder measure .460" at a depth even to the lock notches.
Outside cylinder diameter of the SBH is 1.728" and the 38-40 cylinder measures 1.732". Notches measure .050" deep on both guns.
I realize that 44 Magnum brass is stronger than 38-40. There is no getting around that. But, with all things being equal, seems a lot of wiggle room here.
Opinions???
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Joe S.
.401 Bobcat
Posts: 2,517
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Post by Joe S. on Aug 23, 2019 12:18:19 GMT -5
Could bottleneck cartridges create more pressure than straightwall when loaded to the same potency?
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Post by Encore64 on Aug 23, 2019 12:31:16 GMT -5
Could bottleneck cartridges create more pressure than straightwall when loaded to the same potency? Possibly, but I would think we all load to psi and not necessarily power. Different factors cause velocity variations from gun to gun anyways.
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Post by clintsfolly on Aug 23, 2019 15:50:46 GMT -5
My bet is with a tight chambers you could get a lot more out of it then factory ammo but only with tight chambers.
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princeout
.375 Atomic
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Posts: 1,998
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Post by princeout on Aug 23, 2019 16:40:35 GMT -5
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Post by sixshot on Aug 23, 2019 22:33:32 GMT -5
Huey, I'm watching this with a lot of interest. I have almost no knowledge of the bottle neck hand gun cartridges so this is great stuff & I know that you load several of them as does John Taffin & Lee Martin. Hope to hear more about this project on down the road. Didn't you have a 5 shot cylinder built?
Dick
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Post by kings6 on Aug 23, 2019 23:10:03 GMT -5
If you are talking about a 5 shot cylinder in 38-40 then look at some of Dustin Linebaugh's builds. I think you will find they "scoot right along"!
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Post by Encore64 on Aug 24, 2019 5:24:47 GMT -5
Huey, I'm watching this with a lot of interest. I have almost no knowledge of the bottle neck hand gun cartridges so this is great stuff & I know that you load several of them as does John Taffin & Lee Martin. Hope to hear more about this project on down the road. Didn't you have a 5 shot cylinder built? Dick I did have a 5-Shot built. Reeder used the same cylinder as he uses for the 454 Casull, just reamed for the 38-40. I've pushed the 200s to 1600 fps, so power is no issue. My description and question above is in regards to the 6-Shot cylinders. Using the same steel, strength of a 38-40 would be much closer to 44 Magnum than 45 Colt. No surprise that Lee was right on the money with his data. This is probably the most underrated revolver cartridge I've ever dealt with. It shoots flat and hits hard.
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Post by jimtx on Aug 24, 2019 19:36:23 GMT -5
In my buckeye, I used 10 mm cylinder once. The rest of the time was 38wcf. I used 8grs hp-38 with 175gr FP very mild and accurate. I stepped the same GT bullets 175gr lead FP up to 18grs of 2400 primers were flat but no other I’ll pressure signs and I used the same load with 180 XTPs same flat primers but again no other pressure signs both loads very accurate. The case base went from .463 to .467/.468. Wanted to really test these loads and more but very sadly had to sell the gun.
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Post by Encore64 on Aug 24, 2019 19:42:00 GMT -5
The factory Buckeyes suffered from undersized throats. This causes high pressure as compared to properly sized throats.
The Buckeye I bought waa missing the cylinder. That's why I got Gary to build a 5-Shot Cylinder for it. He set it up for cast bullets with .401" throats.
I've shot 200 grn GT Hollow Point Bullets over 21.0 grn of 2400 with no excessive pressure signs.
Cases have been reloaded many times, with no losses. This is probably due to the tight custom chambers.
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Post by leadhound on Sept 4, 2019 18:02:25 GMT -5
I would think that with tight chambers even thin brass would do well, its fully supported. The weak link to me would be the case head, not sure how it compares to the 44 magnum? The material itself will be the same, just depends on the internal dimensions compared to one another.
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Post by Encore64 on Sept 4, 2019 18:28:10 GMT -5
I would think that with tight chambers even thin brass would do well, its fully supported. The weak link to me would be the case head, not sure how it compares to the 44 magnum? The material itself will be the same, just depends on the internal dimensions compared to one another. I agree with this. 38-40 Brass is the same strength as 45 Colt. My loads will max out at 30,000 psi. In that large case, the 41 Magnum performance is exceeded.
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Post by leadhound on Sept 4, 2019 18:41:41 GMT -5
What did the old High velocity rifle rounds spec out to way back when?
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Post by Encore64 on Sept 4, 2019 18:43:09 GMT -5
What did the old High velocity rifle rounds spec out to way back when? In my old Phil Sharpe Manual, about 26-27,000 psi. The Starline Brass is way stronger these days.
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Post by CraigC on Sept 6, 2019 8:50:39 GMT -5
I've gotten frisky with my Buckeye using "Ruger only" .45Colt for reference but got sticky extraction. Presumably because the chambers are a wee bit rough and the cases are thin. I didn't really pursue it because there were no decent bullets suitable for higher velocities.
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