.45ACP barrel length?

[Bigfoot]

Even less .003"

Here's some loaded 220 gr subsonic 7.62x39, I don't know of a .311 220 gr bullet so I assume it's .308 diameter. http://www.ebr-inc.net/detail.asp?id=3

[Wrangler]

oops! Yep, oh well. Thnaks for the link.I may try some of it.

[pug]

First there is a good chance that the 1:10 twist isn't going to stabilize the 220-240 bullets so their accuracy sucks anyhow. Some claim with fairly good bores they get excellent accuracy with the 308s but I am sure that varies barrel to barrel. My bore is pretty worn so I go with 311s but I would start with 308s and check accuracy. More weights available and also its a lot easier to punch out a 308 squib than a 311 if it gets stuck in the barrel.

[pug]

Bigfoot I forgot to mention the 147 grn 9mm with 3.8grns powder clocks around 980 fps out of a 16" barrel and sounds like a stndard velocity 22lr. With the extra 10" of barrel to cool and expand the gasses Im sure its quieter but dont know how much. Also you would need a 1:10 twist barrel (not some of the 1:16 floating around) to stabilize a 147grn bullet at subsonic velocity. Don't know if you even care but 147s and higher will cycle a semi or FA action also.

[Wrangler]

What powder and charge do you use with the sks and the 9mm?

[pug]

Had to fix my chrono to double check the velocity before posting. These are both start loads for the 9mm and 7.62x39 but both get the bullets out with at least 750 fps at the muzzle so there shouldn't be any stuck bullets but you know how it goes so as always use at your own risk.

9mm: 3.6 grains vv N320
147 grain FP
1.142" OAL
16" test barrel 890 fps at muzzle

7.62x39: 6 grains vv N320
150 sierra SP
Winchester brass (large primer)
2.175" OAL
26" test barrel 765 fps at muzzle

You will get pressure signs before you get over 1000 fps with N320 so you will need to switch to N330 to keep pressure down at that velocity. I'm sure you can change powder brand with a similar burning speed but thats your call.

I am sure you understand that I must also state that this info is correct only applied to my firearms and I do not imply that it is correct and safe to use with yours.

[Wrangler]

Thanks for the heads up on the loads. I have a place to start now.

[Murmur]

Hey D-Mon...thanks for offering with the twist rate calculator. I've just sent an email to a cast bullet supplier for some bullet dimensions for the .457
400 & 500gr cast bullets.
What was it with your suppressed ruger 44 project that went wrong? Interestingly SRT arms (they build a neat looking suppressed 44 Ruger) mention that a faster twist 1-11" douglas barrel should see groups as little as an inch at 100 yds.
How did you find the sound signature compared to your 300 whisper?

[d-mon]

Hello Murmur,
unfortunatly I had to move to New zealnad and never had the chance to shoot my 300 whisper that I left in Scotland. So I could not compare it with the 44mag.
However , I used to shoot a 30-30 contender with subsonic loads and a silencer, the noise or the 44 mag with subsonic bullets and a sopson supressor was barely louder. I was extremely satisfied from this point.
I do not really know what affected the accuracy, weather a bad barrel or a supressor not properly mounted? I would blame the barrel first, because the silencer is cnc built and the guys who make it know how to fit them.

The ruger was properly bedded as well.

I think investing in a good custom barrel with the right twist is a key to accuracy.

ND.

[Murmur]

Hey everyone,
Well I've made up my mind to get a 17 1/2" (Our shortest legal length)
45ACP barrel for my Contender Carbine. JD of SSK Industries recommended the 45ACP route with a 1-16" twist barrel over the 44 mag or 45 colt for subsonic use. Reportedly they have excellent accuracy and ammunition such as Winchester Ranger, Federal Hydrashock & the Speer Gold Dot apparently expand well on deer at 75yds. The 45 should fit the bill nicely as I intend to use a suppressor.....and factory ammuntion is already subsonic!
JD has been extremely helpfull on the matter - I'll keep you posted with the results when I get my barrel in a few months time.