450 Bushmaster

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Joshua M.

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Greetings,
I am on day 350 since my check was cashed for my 450 suppressor...Unfortunately, today was also the last day of deer gun season. I have a TAcSol Barrel for my 10/22 in which the suppressor shroud is “permanently” affixed, so overall length is 16.1 inches, making it legal. They don’t make them for a 450 yet, I was wandering if anyone would have any experience with a short barrel on a 450, as I am thinking about making one for mine, in which my suppressor wil fit down inside, so with the 11 3/4” suppressor attached, we are only at 20” overall. Do you think a 9-10” barrel with a 1-24” twist will be long enough to stabilize, and maintain accuracy to 200 yds? Just spitballing right now...
 
Is your can rated for 450 from a 9in barrel?

There are calculators out there for bullet stability, I would also check that before you went much further. You may well need a custom barrel for a faster twist to make it work rather than being able to bob a 16in designed barrel.

I appreciate what you're trying to do but don't see it done often. Think some have done it for the 300BLK but the market there is a lot bigger.
 
I have gone both directions in suppressing a “one stamp” rifle. Making the can (without the end cap installed) 16.125” OAL and the tube covers it.

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And I have also made the can with a very large “blast chamber” that telescopes back over the barrel, to reduce OAL.

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Both work.

Not much of an issue with the 450 and short barrels though, you are using pistol powders after all.

I have also done it “two stamps” where the can is back inside the tube with a short barrel.

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It works too just costs more if you don’t plan on moving it around.
 
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I have done suppressors on a 16 and 20 inch 450 Bushmaster (not my suppressor but I will have one someday, hopefully sooner than later) and those work fine with 1: 24 twist with bullets as heavy as 405 gr at 1050fps. My personal 450 Bushmaster is a 20 inch gun and will legitimately do 200 yards with super-sonic ammo. I am not sure I see the appeal to a short barreled big bore AR, but each to his own. I think if I was going to do a short barreled 450 BM I would seek out a 1: 16 twist barrel just to be safe. Some guys are making them with the faster twist common to 45 ACP.
 
If you are going to go thru the effort of suppressing an oddball Dedicated AR you probably want it to shoot subsonic to keep noise to a minimum. At that point you may as well just shoot .45 ACP and not worry about blowing your baffles to bits with a short barrel. I'd get .45 ACP AR and call it a day. As a side benefit ammo is cheap and plentiful, even in JHP. At the end of the day will the drop btw .45 ACP and .450 Bush at 200 be that important?
 
If you are going to go thru the effort of suppressing an oddball Dedicated AR you probably want it to shoot subsonic to keep noise to a minimum. At that point you may as well just shoot .45 ACP and not worry about blowing your baffles to bits with a short barrel. I'd get .45 ACP AR and call it a day. As a side benefit ammo is cheap and plentiful, even in JHP. At the end of the day will the drop btw .45 ACP and .450 Bush at 200 be that important?

Depends what you want to use it for. A 45 acp is not going to shoot a 400+ grain bullet.
 
Depends what you want to use it for. A 45 acp is not going to shoot a 400+ grain bullet.

I haven’t shot my 450 suppressed or with subs the 250 gn supers were pretty explosive on the little boar I shot last week. I have killed hogs with my 458 socom using heavy subs, the bullets I use most often are in the 400-500 grain range.
 
barrel with a 1-24” twist

Do you have this barrel or have you yet to get one? The barrel in mine is a one in fourteen twist. I like this idea and have been thinking the same thing. Although Sebastian's idea is more practical, there is no reason to handicap one's imagination. There just may be an outbreak of dinosaurs. In which case you and I would be ahead of the curve.:)
Dinos are smart. They can tell where the shooting is coming from...
 
I have, or well have it in hock, waiting for the stamp, a VERS 458. So, yes, it’s rated for more pressure than the 450 produces...Next, no I don’t want it to be subsonic, as I am going to be using it for deer hunting, thus the reason a 45 acp would be insufficient. I currently have the 1:24 barrel, so I will try that 1st. If I can’t get the accuracy out of it, then I’ll try the 1:14. It appears as if the actual barrel will be around 11”, permanently affix a shroud that will add another 6”, and will when assembled with the suppressor will be 21” overall. The whole reason for trying this is to alleviate the use of hearing protection.
 
I have, or well have it in hock, waiting for the stamp, a VERS 458. So, yes, it’s rated for more pressure than the 450 produces...Next, no I don’t want it to be subsonic, as I am going to be using it for deer hunting, thus the reason a 45 acp would be insufficient. I currently have the 1:24 barrel, so I will try that 1st. If I can’t get the accuracy out of it, then I’ll try the 1:14. It appears as if the actual barrel will be around 11”, permanently affix a shroud that will add another 6”, and will when assembled with the suppressor will be 21” overall. The whole reason for trying this is to alleviate the use of hearing protection.

450 BM actually operates at slightly higher pressure than 458 SOCOM. SAAMI MAP for 450 BM is 38,500 psi where 458 SOCOM is to run a Max Pressure (No SAAMI Spec yet) of 35,000 PSI. Not likely enough for a suppressor to notice.
 
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