450Bushmaster.net

Hello,
Is there a good reason not to have my 450B barrel re-threaded from 11/16-24 to 5/8-24? I know 458 SOCOM is not the same round, but does share some similarities and the 458 barrels seem to be threaded in 11/16-24 and 5/8-24. I understand the 11/16-24 threads give the barrel some more beef between the threads and the bore, but would 5/8-24 take too much away for the 450B?

Thanks for any thoughts or experience on this topic.

- BTW - I hope to use a SiCo Hybrid to suppress my 450B. The Hybrid unfortunately currently has 5/8-24 as the largest direct thread adapter. (Not interested in being talked into a separate suppressor)

I couldn't find the e-mail, but I believe Silencerco announced that they would be offering additional thread patterns for the Hybrid, I'm not sure if that means the threaded mounts or the ASR muzzle devices.

The main issue that I could see is that the majority of 5/8X24 flash suppressors or brakes will have an internal bore diameter designed for 308 projectiles. Make sure you don't shoot the Bushmaster through a 308 hole!

Colohunter wrote:I couldn't find the e-mail, but I believe Silencerco announced that they would be offering additional thread patterns for the Hybrid, I'm not sure if that means the threaded mounts or the ASR muzzle devices.

The main issue that I could see is that the majority of 5/8X24 flash suppressors or brakes will have an internal bore diameter designed for 308 projectiles. Make sure you don't shoot the Bushmaster through a 308 hole!

Defiantly no desire to shoot 450 through a .308. I don't use any sort of flash hider or break so I'm not too concerned about that.

I guess I will have to call SiCo and see what's new if anything.

i'd just be nervous about the sidewall getting to thin and your muzzle doing some serious belling if not worse.


regarding belling in 30 caliber barrels with 5/8x24 threading.
http://bulletin.accurateshooter.com/201 ... uch-steel/

plant_one wrote:i'd just be nervous about the sidewall getting to thin and your muzzle doing some serious belling if not worse.


regarding belling in 30 caliber barrels with 5/8x24 threading.
http://bulletin.accurateshooter.com/201 ... uch-steel/

Regarding the article, I take the barrels were never fired, so would tend to agree with some of the comments about relieving some stress after threading. What would have been nice to know is what the pin tolerance was used to check the bore past the threading as you could be talking as little as .0003 in pin sizes. (for reference a typ sheet of paper is about .004 thick so we're talking about 1/10th the thickness here)

Personally, I'm not good enough with a AR platform, or even a bolt platform for that matter, to test the theory as to how much it would affect measurable accuracy.

I shoot rimfire BR also. The other end of the spectrum from the 450b. A game where precision is everything. Successful barrels have a small degree of choke near the muzzle that you can barely feel when pushing a patch through. A barrel that gets wider near the muzzle is a tomato stake.

As Al said, the impact that would have upon a caliber like the 450b, disappears in the noise floor long before other more critical aspects of precision factor in. This is not a precision caliber for many reasons. It can shoot very well, but you're never going to see precision 5 or 10 shot groups and by that I mean ones that are measured in tenths of an inch at 100 yds.

Turning the muzzle for 5/8 inch threads is not going to produce a blunderbuss. Don't lose sight of the fact that having a muzzle device screwed on over that reduced diameter, increases it's effective diameter back out.

Hoot

Thanks Hoot, that was the type of reasoning I was lookin for. It will always have a suppressor or thread protector on it, and although accurate - I don't expect sub 1/2 MOA groups like with some of my other guns.