cast bullets / 30 carbine


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blarby
January 21, 2013, 05:36 PM
Please walk me through cast bullets and 30 carbine / M1 carbine.

I know that somehow this works well in in this semi-auto rifle, but not others.

I'm interested- but this concept confuses me.


Thanks !

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jcwit
January 21, 2013, 06:16 PM
I cast for my carbine using the Lee mold 90301, this gives a bullet weighing just under 100 grs with the alloy I use, I size them to .310, and lube them with my own mix of bees wax, carnuba wax, paraffin, and mineral oil. Ya I know, but it works for me with no leading. I load with a charge of 12.5 grains of 4227. I get very acceptable plinking accuracy with this bullet and load which the carbine is really not much more than a plinker anyway. I can hit a piece of 4" X 4" Styrofoam at 70 yards ever time offhand, as long as I can concentrate on my shooting.

My biggest problem is controlling my breathing with COPD, smokers beware!

But we all live and learn!

USSR
January 21, 2013, 07:14 PM
Like jcwit, I cast for the .30 Carbine. My mould is a custom one built by Lee, and with my very hard alloy the bullets come out at about 105gr. My load is 12.5gr of 2400 powder. Zero problems using cast bullets in the Carbine which, as jcwit noted, is a short range rifle to begin with.

Don

blarby
January 21, 2013, 07:35 PM
Ok, sounds good so far.

What I'm looking at is the lead/gas system problems. How is this not an issue ? Special cleaning/etc ?

USSR
January 21, 2013, 07:41 PM
Cast them hard and size them .002" or .003" oversized, and there should be no problem. At least, I have never had gas system problems requiring anything more than normal cleaning.

Don

jcwit
January 21, 2013, 07:50 PM
I've shot 1,000's of cast rounds thru 1 of my carbines with no issues. This has been over the last 7 years.

blarby
January 21, 2013, 08:25 PM
Interesting.

Fair enough !

blarby
January 22, 2013, 08:39 AM
Now, to see what the wife wants.

Thanks for your help !

I'm all for it. This rifle has a fantastic bore, and is a fairly good shooter allready.

I can hit a piece of 4" X 4" Styrofoam at 70 yards ever time offhand, as long as I can concentrate on my shooting.

She is taking clays with it at about 50 ish yards, so that would be more than acceptable.

I really can't believe a 7/42 carbine is in this good of condition. I just can't. Someone loved this gun.

SSN Vet
January 22, 2013, 11:19 AM
I know that somehow this works well in in this semi-auto rifle, but not others.

Though I don't have an M1 carbine, I do cast for a Saiga in 7.62x39 and for .357 mag., so perhaps some thoughts may transfer...

1. The #1 issue (as I understand it) casting for rifles is velocity. Rifle velocities and pressures are very high and present a greater challenge wrt. leading, gas cutting, etc. And though you won't find many handguns chambered for .30 carbine, it is, none the less, essentially a pistol cartridge, very much comparable to .357 mag. (which many, many people cast for).

2. The concern with gas operated semi-automatics seems to center around clogging up the gas port as vaporized lead precipitates out on the surfaces of the gas cylinder and piping. I'm not an expert, but it makes sense to me that gas systems that move a lot of gas through generously sized ports and loose fitting pistons will be much less affected by any lead coating. With the Kalashnikov based actions, the gas piston fits loosely into the ribbed cylinder and both are easy to access for thorough cleaning.

3. Gas checks, though they add cost, do prevent a lot of the problems associated with pushing lead boolits fast. You don't typically see them used, however, unless your pushing well over 2,000 fps. Where typical M1 carbine loads (as I understand it) are in the high teens.

I want an M1 carbine so bad I can taste it.... All opportunities to get them at reasonable prices seem to be long gone though. :(

Elkins45
January 22, 2013, 11:14 PM
Cast was all I ever shot thru my M1 carbine. I never had any sort of leading problems. I really wish I hadn't sold that gun.

I'm currently shooting lead they an AR in 300 Blackout. I figure if the gas tube ever fills up with lead I'll just buy another one.

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