first carbine unboxing

[DaveHH]

Considering that the original powder for 30 Carbine was IMR 4227, you might find some of that left somewhere as it is probably rarely used today.

You are going to feel like a fool if you blow the bolt and receiver apart by using the wrong powder. These things were exploding with regularity when being developed until they got the case issue solved. I believe that there is really only one load bearing lug, the other is kind of a guide lug and probably is a safety lug as well. I bought carbine powder from Barnett years ago it was equivalent to Accurate 9.

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[floydthecat]

You are going to feel like a fool if you blow the bolt and receiver apart by using the wrong powder. These things were exploding with regularity when being developed until they got the case issue solved. I believe that there is really only one load bearing lug, the other is kind of a guide lug and probably is a safety lug as well. I bought carbine powder from Barnett years ago it was equivalent to Accurate 9.

I am not new to reloading and the dangers thereof. I have quite a bit of experience with #7 use in pistol-caliber carbine actions and know the limitations. One has to know how to read fired brass and understand the limitations of what the gun is capable of. The carbine action is proofed at a 140% overpressure load. #7 is a rather slow burning powder, so much so that it is recognized as the slowest powder that can be used in a 9mm action. One should always start low and work up. The only reason I tried this was from experience with 9mm. The 9mm and 30-carbine perform at comparative pressures and I’ve used a lot of #7 in 9mm carbine loads.

The point is understood and I think it is foolish to dump a charge in a case without having some experience and understanding about what it might do. Throwing in a handful of something like bullseye or red dot would be seriously stupid.

I am a true believer that one should never trust and shoot anybody else's reloads and that applies here. I don’t ever recommend a reload to anybody and don’t now.

[ssgross]

You are going to feel like a fool if you blow the bolt and receiver apart by using the wrong powder.

Blindly dumping an unpublished charge into a case and firing is one thing - but we are certainly not discussing or promoting that here.

I am a true believer that one should never trust and shoot anybody else's reloads and that applies here. I don’t ever recommend a reload to anybody and don’t now

Very good advice.

[DaveHH]

I'm not saying that you are a novice or questioning your judgement, but consider why does a reduced carbine load of H110 cause pressures to skyrocket? Why does a normal 9mm bullet loaded to operate at say 28,000 cup pressure and the same load in an uncannalured case rise to 62,000cup when the bullet is pushed back into the case .030 deeper? (Straight out of the #10 Speer manual)

Below, excerpted from a 2010 CMP discussion of the subject, basically an autopsy of a busted carbine using slower powder.


"Other powders: Yeah, there are some that are a close match. The ones with a seemingly LOW pressure achieving STANDARD velocity are a problem in carbines. A low overall pressure achieving the standard velocity means a slow burning powder that extends the pressure curve father forward and creates a higher than normal port pressure. May not push on the bolt/cartridge case head hard, but it pushes on the gas piston harder than expected and slams the slide and bolt with more vigor than normal. If you can hear, you hear the wack/wack instead of a schuup/schuup sound. Using those slower powders may well not be an advantage if you understood what is going on inside the barrel and gas cylinder."

It's just information, may help, may not...

[ssgross]

means a slow burning powder that extends the pressure curve father forward and creates a higher than normal port pressure.

Fully understand your point.
To add some more information, Accurate no. 7 is considered a slower pistol powder, but is faster burning than H110, no. 9, or any of the other recommended/go-to 30 carbine powders https://hodgdon.com/wp-content/uploa...rate-color.pdf
.

[floydthecat]

Fully understand your point.
To add some more information, Accurate no. 7 is considered a slower pistol powder, but is faster burning than H110, no. 9, or any of the other recommended/go-to 30 carbine powders https://hodgdon.com/wp-content/uploa...rate-color.pdf
.

I think we have indicated here that nobody has suggested the extreme. 7 and 9 are pretty close on the chart and if you visit the web site and read the description of each, they are very similar, 7 being a bit faster…..but not that much. The only reason this should even be considered is that they are close and I have read across the various forums where carbine shooters have considered trying #7. Accurate is not going to recommend anything that might be the slightest bit risky, they will be in CYA mode.

Do the research and draw your on conclusion. If one decides not to pursue it, that will be the correct decision as well.