Going to join the SBR crowd

[L1A1Rocker]

Well, I couldn't pass up a sale on a 10.5 inch Stainless 300BLK barrel. I've got the lower already (one of the 5 I bought during the glut 3 or 4 years back) and ordered a lower parts kit and upper parts kit from PSA also. I also ordered my fingerprint cards from ATF. Only a few more part to get and lots of time to wait for good deals.

I think I'm only needing the hand guard and bolt carrier group to complete all the major stuff. Anyone know of an inexpensive way to free float on of those Magpul MOE handgards?

I'm also thinking about chopping the barrel down to 8 inches and re-threading it myself. I've got some time to think on it, LOL.

[Schuetzenman]

I think I'd keep the 10.5" barrel as is. Don't most suppressor makers say that 10.5 is the minimum for suppressor use so you don't blow up your suppressor?

[Helen Keller]

for 300blk 8" is the recommended length for bullet stabilization once you drop under 16"



the 10.5 rule applies to 5.56 usually in the 55-62gr neighborhood.

[L1A1Rocker]

I think I'd keep the 10.5" barrel as is. Don't most suppressor makers say that 10.5 is the minimum for suppressor use so you don't blow up your suppressor?

Keller is correct. Most silencer companies won't even warranty their stuff if it's on a 10 inch barrel in 223/556. BUT, the 300BLK has changed that game completely. It's a really cool round. AND, I'm able to cast my own bullets for it to boot. Turned out to be a pretty cheep gun to shoot. Make brass from 223/556, cast your own and save lots of $$$s.

[Helen Keller]

power trimmer is a must.

[Schuetzenman]

Keller is correct. Most silencer companies won't even warranty their stuff if it's on a 10 inch barrel in 223/556. BUT, the 300BLK has changed that game completely. It's a really cool round. AND, I'm able to cast my own bullets for it to boot. Turned out to be a pretty cheep gun to shoot. Make brass from 223/556, cast your own and save lots of $$$s.

I see, still, 8" is virtually a handgun. Color me old fashioned then as even 10.5 seems like a handgun and rifle rounds in such short barrels = slow. For the 10.5" barrel you can tailor your load to the subsonic range. But with the shorter barrel you have limited potential for greater speed if you need it.

[L1A1Rocker]

I see, still, 8" is virtually a handgun. Color me old fashioned then as even 10.5 seems like a handgun and rifle rounds in such short barrels = slow. For the 10.5" barrel you can tailor your load to the subsonic range. But with the shorter barrel you have limited potential for greater speed if you need it.

I know what you mean. It's really hard to get your head around it. I've had a 300blk almost from day one (converted whisper) and I'm just now coming around to the SBR idea. Here's a link to a pdf file on the 300BLK: http://300aacblackout.com/resources/300-BLK.pdf Scroll down to page 18 titled "Typical Velocities in Actual Rifles". There's some more good info on the pages after that.

[Schuetzenman]

Thanks for the link. Scanning through it page 28 shows what I was saying. You will give up about 200 ft. lbs. of energy on a 110 gr. bullet when you go down from the 10 inch range to the 7 inch range of barrel length. A 230 gr. .45 auto round only has 270 ft. lbs. of energy total. If I were to build such a weapon I would probably be OK with the 10.5" but wouldn't go shorter. But that's just how I see the data and what I would have a rifle for. Some how just over 2 inches of barrel reduction doesn't seem like a handling enhancement that is all that big vs. what you give up. Opinions vary no doubt.

[L1A1Rocker]

Thanks for the link. Scanning through it page 28 shows what I was saying. You will give up about 200 ft. lbs. of energy on a 110 gr. bullet when you go down from the 10 inch range to the 7 inch range of barrel length. A 230 gr. .45 auto round only has 270 ft. lbs. of energy total. If I were to build such a weapon I would probably be OK with the 10.5" but wouldn't go shorter. But that's just how I see the data and what I would have a rifle for. Some how just over 2 inches of barrel reduction doesn't seem like a handling enhancement that is all that big vs. what you give up. Opinions vary no doubt.

Thanks for the input/opinion Schuetz. It's much appriciated and respected. But damn, the 8 inchers sure look cool!

http://i1197.photobucket.com/albums/aa436/TacticalElitist/1-2.jpg

http://i898.photobucket.com/albums/ac181/cconn0351/DSC01078.jpg

http://i159.photobucket.com/albums/t135/eracer1111/2ndA/Noveske%20300%20BLK%20SBR/300BLK_SBR_Can.jpg

[Schuetzenman]

Yeah cool. But they also look almost like they are fake weapons, toys in other words. Would you look at it twice if somebody walked into a store with the muzzle brake painted blaze orange around Halloween time? :D

[Helen Keller]

once i get my mold I'm gonna be cranking out 250gr rounds. 220's are nice but Im done paying $23+ a box.

going to be using a "modified " piston setup too .

[FunkyPertwee]

Would you look at it twice if somebody walked into a store with the muzzle brake painted blaze orange around Halloween time? :D

I would actually.

[Schuetzenman]

once i get my mold I'm gonna be cranking out 250gr rounds. 220's are nice but Im done paying $23+ a box.

going to be using a "modified " piston setup too .

I can understand your loathing of over a buck a round prices. The subsonic version of the 300 Blackout is a prime candidate for cast bullets, even without a gas check. Until you go over 1500 fps you don't need a gas check really. I did cast bullet Schuetzen rifle competiton for a few years and chrongraphed a lot of different bullet weights from 7 mm to .32 and bullet weights from 160 to 320 grs. I played with speeds from 950 fps up to 1500 fps. No issues with leading unless I tried to go faster than 1500 fps or unless I got the bullet too small for the groove diameter. I would shoot .002 to .003" over groove diameter bullets with no issues. However, with Schuetzen rifles you preload the bullet into the rifling partially then seat a powder filled case behind it. There was no jump into the bore as with cartridge ammo.

Powder is a real cost saver to in these low velocity rounds, magnum handgun powders and small charges at that. A pound of powder will go a long way.