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Post by hunter01 on Feb 28, 2024 19:54:53 GMT -5
I ran a ladder test with my newly acquired bfr 44 mag this evening. Powder is 22-24gr of wc820 in .5gr increments. Federal 150 primer for all loads. Bullet is a lee 310rf with the gas check shank cut off for a 260gr weight. Bullets were PC and checked with a plain base check. 22gr: 4 in 1" and 5th opened it to 1.5" 22.5gr: 4 in 1 3/8" 5th opened it to 2 1/8" 23gr: 4 in 7/8" 5th opened to 1 5/8" 23.5gr: 4 in 1 1/8" 5th opened to 1 5/8" 24gr: didnt bother measuring but likely 2" Pic is the 23gr group  I loaded 12 more rounds to "prove" the 23gr load. Both groups had 4 in sub 1" and 2 fliers opening the group to 1.5". The fliers are consistently high and mostly left. Groups were shot out of a second story window off a rolled up piece of foam. Range is 31yds because thats what looked like 25yds when i set the target frame and i just havnt moved it. Im guessing the consistent fliers are caused by 2 cylinder throats that are slightly undersized. 4 chambers take a .430 pin and 2 wont. All bullets were sized to .430. I did also shoot another control group of an arbitrary load of 23.5 wc820 and the MP 432-640 with the large HP pin. This load put 4 in 1" with a flier to 1 5/8". |
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Post by Encore64 on Feb 28, 2024 19:59:11 GMT -5
Any thoughts on marking those two chambers and confirming the flyers?
Plan on bumping up loads to see what it'll do?
Brian Pearce did some 50k PSI loads in a Redhawk and it was impressive.
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Post by hunter01 on Feb 28, 2024 20:11:47 GMT -5
Any thoughts on marking those two chambers and confirming the flyers? Plan on bumping up loads to see what it'll do? Brian Pearce did some 50k PSI loads in a Redhawk and it was impressive. Yeah, I'll probably mark the tight ones to prove it, but there is nothing random about it. I fully intend to push into the 50k realm with this gun, but only accuracy is interesting right? Im sure i can get some really impressive numbers out of it, but without consistent FULL CYLINDER accuracy, i just dont care. Im not one to mark an "accurate" chamber and hunt with it. I want them all to shoot well. |
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Post by Encore64 on Feb 28, 2024 20:17:46 GMT -5
But, if undersized that can be easily fixed.
Look forward to following this project.
Thanks in advance for sharing results...
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Post by hunter01 on Feb 28, 2024 20:28:31 GMT -5
Ill try to load a few tomorrow and check the two tight chambers to make sure they are the culprit. If i do, ill get out the chrono and see where velocity is as well.
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Post by bigbore5 on Feb 28, 2024 23:02:18 GMT -5
I've never seen inconsistent throats in a bfr before. I'm sure mri will correct it. Or there's always Fermin, who does excellent work.
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Post by Cholla on Feb 28, 2024 23:26:55 GMT -5
Nice shooting. Keep those targets coming.
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Post by hunter01 on Feb 29, 2024 8:52:27 GMT -5
I've never seen inconsistent throats in a bfr before. I'm sure mri will correct it. Or there's always Fermin, who does excellent work. Everyone has a spec. MR is surely much tighter than ruger and perhaps not quite as tight as FA, but i doubt that .0005 (or whatever the discrepancy actually is) is outside of their specs. Ill either send it out to Mr Garza or get a .431 chucking reamer and do it myself. I will first prove that it is the throat causing the issue but i cant imagine its not. Ive shot six =<1" groups of 4 shots with a 5th shot outside the group. I also shot two full cylinders with 4 going into 1" and two shots out. There has not been a single group of that load, or any other, that hasnt shown the tendency. There have been groups too large to call anything a flier, but only during the ladder. I also shot the 432-640 with the same outcome to rule out the bullets since i did modify the lee mold and its possible all 6 bases werent cut precisely the same. I am relatively new to chasing accuracy with revolvers so any other theories are welcome. |
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Post by hgunhtr on Feb 29, 2024 9:20:20 GMT -5
chuck,
you got it right, mark and uniform those cylinders and I think you will be good to go. Are you using irons or a red dot for your testing of this 44. either way that is some good shooting. how is the recoil impulse on the 23.0 gr load? is it near max?
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Post by Cholla on Feb 29, 2024 9:29:47 GMT -5
chuck, you got it right, mark and uniform those cylinders and I think you will be good to go. Are you using irons or a red dot for your testing of this 44. either way that is some good shooting. how is the recoil impulse on the 23.0 gr load? is it near max? I have the same problem AFTER the throats have been reamed and uniformed on both my Blackhawks; the first three or four shots literally into one hole at 25 yds., then the fourth and fifth, or just the fifth fling out an inch or so away. Or more commonly four are stitched into aomg hole, then one or two thrown out. As such, I know beyond a doubt with me the problem is ME and my crappy bench shooting technique. photos.app.goo.gl/WLEBDtuo7sNM8CAk8photos.app.goo.gl/HADQwFVpkJkN86Nu9 |
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Post by hunter01 on Feb 29, 2024 10:06:10 GMT -5
chuck, you got it right, mark and uniform those cylinders and I think you will be good to go. Are you using irons or a red dot for your testing of this 44. either way that is some good shooting. how is the recoil impulse on the 23.0 gr load? is it near max? Im thinking i can probably go to 25gr in this gun dave. The recoil at 23gr is certainly brisk but i couldnt really tell a difference from 22-24gr in recoil. Im using a riton dot on this one that i had on hand. Supposed to be 4moa but its bigger. Totally covers a 2" pasty at 31yds. Im going to get another of those rxs250 bushnell i was telling you about. Best ive found so far. |
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Post by hunter01 on Feb 29, 2024 10:12:24 GMT -5
chuck, you got it right, mark and uniform those cylinders and I think you will be good to go. Are you using irons or a red dot for your testing of this 44. either way that is some good shooting. how is the recoil impulse on the 23.0 gr load? is it near max? I have the same problem AFTER the throats have been reamed and uniformed on both my Blackhawks; the first three or four shots literally into one hole at 25 yds., then the fourth and fifth, or just the fifth fling out an inch or so away. Or more commonly four are stitched into aomg hole, then one or two thrown out. As such, I know beyond a doubt with me the problem is ME and my crappy bench shooting technique. photos.app.goo.gl/WLEBDtuo7sNM8CAk8photos.app.goo.gl/HADQwFVpkJkN86Nu9Dont know if those groups are cherry picked or representative, but thats some mighty fine shooting! My personal criteria is going to be 1" at 25yds for a full cylinder. When i get there ill be content. |
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Post by hgunhtr on Feb 29, 2024 10:22:07 GMT -5
you may find that you are going to do better work with a new dot that doesn't cover the target. with the group you have shown, you have figured out something for a positive aiming point. if you mount one of those brand new, old stock 2x Leupold scopes on it for load testing to determine the best groups and then switch to a red dot you will have done everything to get the most accurate load. then after you figure out that I was right all along, that the 44 is the perfect caliber, (ha ha) just go out and try to wear it out. I'm looking forward to the load testing on this one and the dead hog pictures that come with it!
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Post by Cholla on Feb 29, 2024 10:36:16 GMT -5
Dont know if those groups are cherry picked or representative, but thats some mighty fine shooting! My personal criteria is going to be 1" at 25yds for a full cylinder. When i get there ill be content. Thanks. My photos with the load data noted are part of my record keeping when I test loads. As such, it would make no sense to cherry pick loads. That said, it's beyond frustrating to know that I can't shoot my revolvers to their full potential! |
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Post by Encore64 on Feb 29, 2024 11:53:44 GMT -5
chuck, you got it right, mark and uniform those cylinders and I think you will be good to go. Are you using irons or a red dot for your testing of this 44. either way that is some good shooting. how is the recoil impulse on the 23.0 gr load? is it near max? I have the same problem AFTER the throats have been reamed and uniformed on both my Blackhawks; the first three or four shots literally into one hole at 25 yds., then the fourth and fifth, or just the fifth fling out an inch or so away. Or more commonly four are stitched into aomg hole, then one or two thrown out. As such, I know beyond a doubt with me the problem is ME and my crappy bench shooting technique. photos.app.goo.gl/WLEBDtuo7sNM8CAk8photos.app.goo.gl/HADQwFVpkJkN86Nu9Cholla, I have to disagree with you here. Even if throat tolerances, etc are perfect, it does not guarantee the problem is you. Keep in mind chambers cut out of alignment can cause this because bullets hit the forcing cone differently. Any number of things can cause flyers when you're doing everything right. |
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