Gas checks, Do I need them or not? [Archive] - Glock Talk

PDA

View Full Version : Gas checks, Do I need them or not?


country85
08-09-2012, 21:20
I know for higher velocity bullets you will certainly need gas checks, I know they're are variables like types of alloy bullet type etc. I plan on pushing some 44 mag hard cast at or a little above 1,300 fps out of a rifle using H 110. I've heard people say that you can go up to 1600 with no check but I just don't see going that fast unless you fill your barrel with lube and then shoot lol. I've been researching this but can't seem to find an answer that makes remote sense :supergrin:

fredj338
08-09-2012, 22:04
No need for a gc on a 1300fps bullet if it fits right. I have run 45-70, plain base @ 1600fps+ w/ good results. THese were just straight ww alloy, 12BHN. Now if you are going to have a soft bullet or undersized bulet, you can get leading @ 1100fps.

country85
08-09-2012, 22:19
Yea these things are in no way under sized, they are dropping about what my barrel slugged at witch is .432, I was just loading some a couple minutes ago and you can actually see the out line of the bullet in the case lol,

noylj
08-15-2012, 02:16
No, you don't need a GC until you get up to 2000 fps. Proper size (and a little never hurts), proper lube, and proper alloy are all you need.
What is now considered a "soft" alloy (12-14BHN) is actually harder than needed for any non-magnum high pressure pistol load and 6-8BNH is often better for light target loads.
Get the Lyman or RCBS cast bullet manuals and learn about them. Go to the Cast Boolits forums for other information.

dla
08-15-2012, 05:48
I run Plain Base bullets at a little over 1800fps from my 45-70. Gas-checks make it possible to shoot a slightly undersized bullet. Casters like gas checks because they only have to carry one bullet size.

I've never pushed a properly fitting bullet fast enough to observe leading from lube failure.

The very best site to search for info on this is castboolits - lots of old codgers who have years of experience pushing lead bullets around.

country85
08-15-2012, 05:53
No, you don't need a GC until you get up to 2000 fps. Proper size (and a little never hurts), proper lube, and proper alloy are all you need.
What is now considered a "soft" alloy (12-14BHN) is actually harder than needed for any non-magnum high pressure pistol load and 6-8BNH is often better for light target loads.
Get the Lyman or RCBS cast bullet manuals and learn about them. Go to the Cast Boolits forums for other information.

Thanks for the info!!! Yea the last batch of boolits I cast up are hard as rocks. I have an old lyman book, 42nd or 46th I think, and there's some stuff on gas checks, just not a lot them. And I am on CB, but there's just so much info and so many threads over there it's hard to find what you're looking for lol

Zombie Steve
08-15-2012, 06:54
.44 mag out of my rifle is going 1,680 fps average... no gas check... no problem. 244 grain lswc / water dropped wheel weights. I could probably get away with air cooled.

country85
08-15-2012, 09:14
.44 mag out of my rifle is going 1,680 fps average... no gas check... no problem. 244 grain lswc / water dropped wheel weights. I could probably get away with air cooled.

Is that with your unique load steve? I have a bunch 240 grain lswc loaded with 8.5 and they seem very very mild to me, I thought about going higher, my lyman book list 12 grain max, but I don't want to completely melt the boolit before it even exits the barrel lol

Gunnut 45/454
08-15-2012, 11:34
I run 45LC/454 Casull cast plain base bullets at 1700 fps plus all the time . Now for my other calibers .224, .308 ,.323 I have found Gaschecks are needed to get accurate loadings above 1700 fps. Below 1700 fps I can and do use PB casts.:supergrin:

country85
08-15-2012, 12:09
I run 45LC/454 Casull cast plain base bullets at 1700 fps plus all the time . Now for my other calibers .224, .308 ,.323 I have found Gaschecks are needed to get accurate loadings above 1700 fps. Below 1700 fps I can and do use PB casts.:supergrin:

What kind of lube are you using?

Zombie Steve
08-15-2012, 12:45
Is that with your unique load steve? I have a bunch 240 grain lswc loaded with 8.5 and they seem very very mild to me, I thought about going higher, my lyman book list 12 grain max, but I don't want to completely melt the boolit before it even exits the barrel lol

My rifle load is 18.6 grains of 2400.

I would say you shouldn't push Unique that hard. Again, I've had pierced primers with 10 grains of unique and this particular 240 lswc.

country85
08-15-2012, 18:39
My rifle load is 18.6 grains of 2400.

I would say you shouldn't push Unique that hard. Again, I've had pierced primers with 10 grains of unique and this particular 240 lswc.

I remember you saying that steve. My known safe load is 8.2 grains, so I loaded up a "step batch" I loaded 5 at 8.8, 9.5 and then 10 grains. Double checked and my Lyman list this bullet in the rifle section at 12 grains max, I have no desire to push it past 10 grains, if I can even get that high. I also just read an article about using 10 grains of unique for a 300 grain boolit...NO WAY I would try that, I would have to work my way in tenth grain increments if I did lol

Gunnut 45/454
08-15-2012, 22:14
country85
Home brew! Ivory Soap/wax/ bearing gease . Nothing fancy - but very useable! Just add enough wax to make it stiff at room temp.