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Old January 6th, 2019, 11:39 AM #11
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Quote:
Originally Posted by Pinecone View Post
Are you measuring the cases and trimming each time?

I have heard that .30 Carbine is VERY sensitive to case length.
That is why I never ever crimp an .30 M1 cartridge.
The cartridge headspaces on case length.
I have so much brass that I never trim.
Once in a while I will have a fail to fire and when I compare it
to another cartridge I find the case is just a tap long.
If you crimp the cartridge it may be a hair shorter.
The hammer will fall and you will notice a like strike on the primer.
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Old January 6th, 2019, 11:42 AM #12
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Originally Posted by Art3 View Post
I'd focus on getting it working with factory ammo first. I've heard some of the imported ammo can be a little light (Aquila, PPU). Maybe try some Remington (I've seen it at gun shows for $23-25 a box). If it doesn't work with factory ammo, something else is wrong. I think you're wasting your time tweaking handloads if there is a mechanical problem. Is the castle nut that holds the piston in tight? Does it stay tight after it's been shot? What mags are you using? Any of them GI? Proper lubrication?
I agree. If its short stroking its likely a plugged gas port, stuck piston or maybe op rod dragging somewhere. As mentioned, it could be a mag issue too. You haven't shot cast bullets in it have you?
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Old January 6th, 2019, 11:44 AM #13
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Quote:
Originally Posted by SKIP View Post
That is why I never ever crimp an .30 M1 cartridge.
The cartridge headspaces on case length.
I have so much brass that I never trim.
Once in a while I will have a fail to fire and when I compare it
to another cartridge I find the case is just a tap long.
If you crimp the cartridge it may be a hair shorter.
The hammer will fall and you will notice a like strike on the primer.
I've never had them stretch and only crimp enough to take out the mouth flare
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Old January 6th, 2019, 12:18 PM #14
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Quote:
Originally Posted by Seabee View Post
I've never had them stretch and only crimp enough to take out the mouth flare
When I seat the bullet the case mouth flare is gone.
However, I have very little case flare. Just enough to allow seating.
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Old January 7th, 2019, 08:18 AM #15
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Quote:
Originally Posted by Seabee View Post
I agree. If its short stroking its likely a plugged gas port, stuck piston or maybe op rod dragging somewhere. As mentioned, it could be a mag issue too. You haven't shot cast bullets in it have you?
I have not, however I inherited it from my father in law's estate... who knows what he shot thru it.

I'm considering sending it in to a gun smith to evaluate it and what not but the gun smiths i've spoken with typically say it'll be a few weeks before they get to it. which, leaves me sad inside hahaha.
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Old January 7th, 2019, 10:21 AM #16
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Quote:
Originally Posted by SKIP View Post
That is why I never ever crimp an .30 M1 cartridge.
The cartridge headspaces on case length.
I have so much brass that I never trim.
Once in a while I will have a fail to fire and when I compare it
to another cartridge I find the case is just a tap long.
If you crimp the cartridge it may be a hair shorter.
The hammer will fall and you will notice a like strike on the primer.

do you ever get bullets set back on feeding? No crimp scares me in anything except bolt guns... personally.
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Old January 7th, 2019, 11:01 AM #17
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Quote:
Originally Posted by Moorvogi View Post
do you ever get bullets set back on feeding? No crimp scares me in anything except bolt guns... personally.
I use IMR 4227 which pretty much fills the case with a 110 FMJ.
I never worry about it.
Not knowing your location why not meet at the AGC one day.
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Old January 15th, 2019, 10:30 AM #18
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tried some more w/ LIL gun this weekend. i loaded 10 w/o primers or powder.. and cycled the bolt manually. zero feeding issues.. i introduced powder n primers and it fed the first one off the magazine, but jammed @ the feeding ramp almost 90% of the time. if i put THAT bullet in the magazine again manualy and pulled the bolt back all the way.. it fed fine.

this leads me to believe it's not cycling the bolt back all the way because of what changed from feeding inert rounds to live rounds fed from the gas of the round before. i THOUGHT the gas port was clear, i'll have to take another (perhaps better) look.
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Old February 12th, 2019, 06:08 AM #19
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M1 carbine cycling

Make sure the hole in the receiver where the spring fits is completely clean. Residual dried 75 years old grease is like tar. This restricts the spring function. Use a bore brush and solvent. Lub the spring with oil and grease the slide grooves.
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Old February 21st, 2019, 06:24 AM #20
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i met SKIP at the range one weekend. 100% success. I also then fired the ones that i had which were causing some problems and... 100% success. I'll check the holes n metal again. the bolt does have an ever so slight catch when cycling. i wouldn't even call it a "catch" more like "moment of extra tension" about 2/3 of the cycle stroke. then it goes back to "normal".
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