30 Carbine Failure to Feed

[blgarin]

http://youtu.be/AClsTQGo-t0

I'm having some trouble getting my cast 30 carbine rounds to feed. The link above is a short video showing what the gun will do with factory ball and my casts. (Cliff Notes: cycles fine, doesn't cycle fine)

I'm running the Lee 309 RN 120g bullet over 6g Unique and an OAL 1.675.

The factory's OAL is 1.662 and 110g RN.

Thoughts?

[35remington]

The problem is in getting the port pressure high enough to cycle the gun. Unique is too fast. H110/2400 are examples of correct powder speed.

[leadman]

Even Blue Dot if very iffy in cycling the action. As stated above, H110/296. Also Alliant 2400 and MP300, IMR 4227. If you can find surplus WC820 this is what was loaded in military ammo. VV110 is supposed to also work but I have no experience with it.

[newrib]

My carbine does not feed just like yours when using the same 6 grain Unique load. I switched to IMR4227 at 13 grains with the same LEE bullet and it will feed great. My best 100 yard benched groups are about 10 shots in 6 to 7 inchs. Good Luck with yours

[dudel]

Clearly the wrong powder. Watch the brass ejection where it cycles fine. Brass is thrown out of the frame. On the reloads, the brass barely makes it four inches over the ejection port. The next makes it out; but nowhere near as energetically.

I'd switch from Unique to H110 or 2400. I find small pistol primers work fine with 2400 (but not with H110). Seems like gas pressure is on it's way down by the time your boolit gets past the gas port. On top of that, cold weather isn't helping. I don't think more Unique is the answer.

[spfd1903]

Same experience with a gas checked Lee C309-113-RF and an SNS 115 grain hard cast commercial boolit. H110, VV N110, and Alliant 2400 give 100% reliability. Just obtained some IMR 4227 and finished trimming about 300 pieces of once fired brass. I have found the best accuracy with the VV N110 out of an Underwood carbine, but curious to try the 4227 now.

[mattw]

11 grains of h110 with a 130 grain bullet is the ticket. About 3 inches at 100 in mine.

[zomby woof]

Try 1.610"

[badgerblaster]

Agree with 110/296. My IBM is 100% reliable with that and the lee 120 gr.
I get a lot of dented brass just like yours. They have all reloaded and re-shot just fine.
That gun is a lot of fun with cast boolits! The kids love it and can shoot it all day.

[N4AUD]

Somewhere back in the dark recesses of my brain it seems like I remember that H110 was developed FOR the M1 carbine. I wouldn't swear to that but seems like I read it somewhere.

[Cherokee]

I use AA9 and Lyman 311359 in my M1C. Works great.

[Larry Gibson]

http://youtu.be/AClsTQGo-t0

I'm having some trouble getting my cast 30 carbine rounds to feed. The link above is a short video showing what the gun will do with factory ball and my casts. (Cliff Notes: cycles fine, doesn't cycle fine)

I'm running the Lee 309 RN 120g bullet over 6g Unique and an OAL 1.675.

The factory's OAL is 1.662 and 110g RN.

Thoughts?

That is not failure to feed. Your cast reloads fed fine when you cycled the action. What you had was failure to function.

As mentioned the 6 gr of Unique does not give enough gas port pressure to function the action. I would suggest changing to H110/296 powder. N4AUD is correct that H110 was developed for the 30 Carbine cartridge. I have been shooting cast bullets in numerous M1/M2 carbines since '68. I long ago switched to H110 for use with cast and jacketed in the 30 Carbine and have found no reason to use another powder. However, AA#9, 2400 and 4227 will work very well also, especially with your 120 gr cast.

Larry Gibson