.32 S & W Bullets tumbling, unstable - Graybeard Outdoors
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post #1 of 13 (permalink) Old 11-15-2019, 07:00 PM Thread Starter
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Default .32 S & W Bullets tumbling, unstable

I loaded 79 grain lead round nose bullets in .32 Smith & Wesson cases with 1.32 grains of Bullseye. Shot out of a Iver Johnson revolver with a two and a half inch barrel, the bullets are not very accurate, and enter the target sideways at 7 yards. Does anyone have any idea why this is happening?
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post #2 of 13 (permalink) Old 11-20-2019, 01:14 PM
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Since no one has answered, I'll give it a try. Bullets that "tumble" are unstable in flight. Several reasons for bullet instability, but most often is bullet to barrel fit. Slug the barrel and measure the diameter of the cylinder throats. Throats need to be larger in diameter than the groove diameter of the barrel. Cast bullets should be no smaller in diameter than the cylinder throat diameter. Condition of the gun is also a consideration. Is the barrel worn? Is the rifling sharp? General overall condition of the gun?

Perhaps you can find the original factory load for that caliber, bullet size, shape and weight and approx velocity and duplicate that load. How old is the gun? 32 S&W Short? 32 S&W Long?

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post #3 of 13 (permalink) Old 11-20-2019, 01:19 PM
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Sounds reasonable, I don't know about the 32 but the 38 S&W was a slightly larger diameter than the 38 Special and is a bullet that is hard to find in the .362 diameter, or whatever it is supposed to be.

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post #4 of 13 (permalink) Old 11-20-2019, 01:35 PM
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Found this, I believe it's from a Lyman 44th Edition manual.
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post #5 of 13 (permalink) Old 11-22-2019, 01:26 PM Thread Starter
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Quote:
Originally Posted by mdi View Post
Since no one has answered, I'll give it a try. Bullets that "tumble" are unstable in flight. Several reasons for bullet instability, but most often is bullet to barrel fit. Slug the barrel and measure the diameter of the cylinder throats. Throats need to be larger in diameter than the groove diameter of the barrel. Cast bullets should be no smaller in diameter than the cylinder throat diameter. Condition of the gun is also a consideration. Is the barrel worn? Is the rifling sharp? General overall condition of the gun?

Perhaps you can find the original factory load for that caliber, bullet size, shape and weight and approx velocity and duplicate that load. How old is the gun? 32 S&W Short? 32 S&W Long?
The rifling is there, some pitting, but I don't think that's the issue. The gun was made about 1890. The original load was .32 S & W (short) blackpowder load. I would rather not use blackpowder. I will check the fit as suggested.
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post #6 of 13 (permalink) Old 11-22-2019, 02:33 PM Thread Starter
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[QUOTE=mdi;2055973162]Since no one has answered, I'll give it a try. Bullets that "tumble" are unstable in flight. Several reasons for bullet instability, but most often is bullet to barrel fit. Slug the barrel and measure the diameter of the cylinder throats. Throats need to be larger in diameter than the groove diameter of the barrel. Cast bullets should be no smaller in diameter than the cylinder throat diameter. Condition of the gun is also a consideration. Is the barrel worn? Is the rifling sharp? General overall condition of the gun?

The cylinder throats are 0.330", groove diam, is 0.309"-0.310", bore diam. is 0.304"-0.305", bullet diam, is 0.312".
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post #7 of 13 (permalink) Old 11-22-2019, 06:28 PM Thread Starter
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Default Getting strange, vented muzzle crown?

While I am taking photos of the muzzle, I notice some nicks in the grooves at the muzzle. So I figure maybe I will recrown the muzzle using a brass screw head. I examine the muzzle closer and discover that each groove, at the muzzle, has a vee shaped notch in it, exactly at the center of the groove, extending down the rifling, maybe 0.020". Since each groove has an identical notch, it appears they were made on purpose. Has anyone ever experienced these such notches and can explain what they might be and the purpose?
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post #8 of 13 (permalink) Old 11-22-2019, 11:00 PM
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If those nicks extend straight down the barrel instead of following the rifling, they could serve to destroy the accuracy.

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post #9 of 13 (permalink) Old 11-23-2019, 02:36 PM Thread Starter
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Quote:
Originally Posted by ulav8r View Post
If those nicks extend straight down the barrel instead of following the rifling, they could serve to destroy the accuracy.
The notches don't go down the length of the bore . They only go down about 0.020". They are very precise and identical in each groove of the rifling.
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post #10 of 13 (permalink) Old 11-23-2019, 07:50 PM
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you cant make chicken salad out of chicken poop. its a belly gun and never be more than that. have fun shooting it. would be a fun gun to teach some kids and have some laughs. regards, richard
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