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Old January 28, 2017, 08:33   #1
K. Funk
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Gas Check Question....

Using gas checks with cast bullets is new to me, I usually load flat or bevel base bullets. However, I found myself with some cast .430 bullets with the relief for gas checks. So I got myself some gas checks and proceeded to size the bullets and seat the checks. So my question is...Upon firing and leaving the barrel, do the checks stay on the bullet or do they separate?

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krf
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Old January 28, 2017, 10:16   #2
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Awful lot of back and forth on this topic. Will be watching this one.
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Old February 26, 2017, 10:44   #3
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interesting question and I dont have the answer,,will say that when I started reloading and hunting with my 86' winchesters,45-90 and 45-70,,both rifles dated 1890,,shooting hard cast bullets i couldnt get better then a 16" group at 50 yards,,put copper gas checks on my reloads and both rifles fire a 2" group at 100yds,,,,,,,i used them for whitetail hunting in my back yard, those hard cast lead bullets go thru a 1/4" steel plate at 250 yards out of the 45-70 ,405 grain slug,,,my 7mm mag,30-06,220 ackley improved and .223 just put shiney marks on the plate,,and that was a swinging plate, not stationary.,,,,,,,point being i could never find a fired slug.
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Old February 26, 2017, 11:28   #4
tdb59
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Quote:
Originally Posted by K. Funk View Post
Upon firing and leaving the barrel, do the checks stay on the bullet or do they separate?

Thanks,

krf
Yes.

Depending on bullet hardness, diameter at the base, crimp engagement...

38 cal gas checked bullets recovered from the berm at our bullseye range had the gas checks intact.

44s from our combat range, not so much.


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Old February 26, 2017, 12:23   #5
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Quote:
Originally Posted by tdb59 View Post
Yes.

Depending on bullet hardness, diameter at the base, crimp engagement...

................
^^^^ this

if you have the sizing right, hardness is less important in keeping the check on, and as long as you have the crimp tight/sized to the bullet base you're good to go
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Old February 26, 2017, 13:39   #6
bouncer50
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I been casting lead bullet for all most 35 years. The purpose of a gas check is to protect the base of the bullet from hot gases till it leave the barrel. If it fall off or stay on the bullet it make no different what i have found out.
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Old February 26, 2017, 14:26   #7
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Quote:
Originally Posted by tdb59 View Post
Yes.

Depending on bullet hardness, diameter at the base, crimp engagement...

38 cal gas checked bullets recovered from the berm at our bullseye range had the gas checks intact.

44s from our combat range, not so much.


................
Taking castbullets a lot of different opinion on gas check on pistol. Pistols like 45 acp 38 Special do need GC bullets. Even 44 mags and 357 do not need GC bullets if the bullet is hard enough and the bullet is correct to the bore size. But you get into rifle bullets GC are needed. Driving a lead bullet 1500 to 2000 FPS will be lead plated barrel with out GC
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Old February 26, 2017, 16:39   #8
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don't know about not needing checks on hard bullets, some think hard bullets cause gas cutting due to not upsetting fully in the bore, which causes leading. Lee is one of those, and his book states just that.
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Old March 04, 2017, 21:52   #9
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Almost every gas check bullet have recovered gas check was still attached or not far behind bullet in test media. Only exception are my cheap aluminum used with 7.62x39. Loadimg steel cases (free) with lead bullets and aluminum gas checks and Reloader 7 is more accurate than most factory ammo to 75 yards. With these either most separate or most stay based on batch. Believe alloy and exact thickness of aluminum used in homebrew gas check punches is responsible for the phenominum. I use gas checks with 357, 41, 44 and 454 magnum to reduce leading with wheel weight alloy. Lyman copper properly mashed on seem to hold on. YMMV.
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