50 Beowulf vs 458 socom vs 450 bushmaster from 12" barrel

[redbullitt]

Got my upper from tromix. They were very quick and easy to deal with. Most importantly it works great!

My favorite part is I can just swap my upper in place of my 556 and have a big bore rifle without having to buy another rifle or tote one. Same feel and controls on the gun etc. I have an extra heavy buffer and spring to play with, but have not been able to do it yet.

Will try to get a deer with it this year. I expect performance to be in 4570 territory, or better, so it should hammer them.

Accuracy is great. I have a 4x acog on it and with the hornady 325s I am very consistently under 1.5 inches at 100 yards. Minimal load work, so I am sure there is more left on the table. Have not gotten to work up anything with the barnes bullet yet, but soon hopefully.

 

[LoonWulf]

For deer take a look at the 300grn ballistic tip, the muzzle loader one, not the one for .45-70.Nosler has Data available for it on their site. Im running the RL-7, trajectory is pretty decent considering, (I actually use a muzzle loader scope on my gun now), and the velocity is right in the range the bullets designed to operate at.

I have a solid buffer and heavy spring that I use for both my Grendel and my .458, since i dont have adjustable gas blocks they do help keeping the gun from slinging brass into next week. Recoil isnt a huge issue its a nice firm shove.
With the Tromix built upper Id try one part at a time, you may find that it is less over gassed then some of the others.

Ya know, Ive been running my gun sans muzzle break and honestly it looks a little wierd, but other than that, and the blast not being as bad I cant really tell much of a difference.
With these low pressure rounds I dont think the breaks really do alot of good. When i build another .458 (which i probably will, as my buddy keeps pestering me for the one i have), ill probably go with a 18" barrel sans muzzle device.
You MAY want to consider getting a non SBR length barrel and omitting the muzzle device. You'll likely only end up with a gun thats about 2" longer than you would with a 12" and a break. that is if you arnt bothered by the way it looks, cause they DO look funny without something on the end.

 

[MCMXI]

I have a .450 Bushmaster with a 20" barrel but am going to have it cut down to something in the 12" range and will have the muzzle threaded 5/8-24 for a suppressor (Ti-RANT 45 or Hybrid subsonic only?). Running numbers for the 300gr XTP MAG in QuickLOAD indicates that there's about a 180 fps loss going from 20" (1,975 fps) to 12" (1,795 fps). I'll be shooting the 260gr bonded AccuTip BT from Remington and with a 12" barrel should be up around 2,100 fps. Adding a suppressor typically increases velocity so I might get up to 2,200 fps ... we'll see. I'd like to work up a subsonic load for it too at some point using the 300gr XTP MAG or similar. Basically this will be a bear protection gun for me while hiking. I removed the 1.5-5X scope that I had on the rifle and now only have a set of Troy BUIS. I bought a set of replacement front posts with narrower profiles to help with aiming, but overall the rifle is surprisingly accurate and has proven to be rock solid reliable without a single issue in 200 or so rounds.

 

[CraigC]

Is the TiRant approved for the .450 at subsonic levels?

 

[MCMXI]

Is the TiRant approved for the .450 at subsonic levels?

AAC states not to use +P .45 ACP ammunition... that's all the info I can find. Pressure at the muzzle is the key and QuickLOAD is helpful there. A typical 230gr .45 ACP shot from a 5" barrel has around 2,500 psi at the muzzle.... not sure about a 3" or 4" barrel but they're going to be higher.

 

[CraigC]

What about the .450?

 

[jmorris]

I don't have any idea about AAC's can but my 458 socom suppressor had a 4140 blast baffle and 6061 K baffles and it has held up to everything I have thrown at it. It does have a quite large initial chamber though.

 

[MCMXI]

Is the TiRant approved for the .450 at subsonic levels?

What about the .450?

Running the numbers in QuickLOAD, the pressure at the muzzle of a 12" barrel shooting 300gr Hornady XTP bullets at 1,050 fps is 1,708 psi which is very low. With a 16" barrel the pressure drops to 1,185 psi and the velocity bumps up a bit to 1,105 fps. The bottom line is that there's no question that the Ti-Rant 45 is safe with .450 Bushmaster subsonic loads since the pressure at the muzzle is less than a 230gr .45 ACP from a 5" barrel. The big question for me is whether a 260gr load going 1,850 fps from a 12" barrel and producing 5,500 psi at the muzzle is a problem for the Ti-Rant 45.

I'm sending my .450 BM barrel out today to be cut down from 20" to 12" and having the muzzle threaded 5/8"-24 for the AAC fixed barrel adapter... whoohoo!

 

[LoonWulf]

I want a supressor.....

 

[adcoch1]

I want a supressor.....

Me too loonwulf, and it is so annoying having a lathe in the shop and only the paperwork holding me back. I'm almost a year from my first suppressor paperwork being filed and i still don't have it back....

 

[LoonWulf]

Ouch hell of a wait...we still cant own them here

 

[CraigC]

It was 6-7months before the rule change last July. A LOT of folks got theirs in right before the change went into effect and that has really extended wait times. I'm waiting for two myself that should be in soon, a TiRant .45 and a TacSol Axiom but haven't even submitted paperwork for my Hybrid yet. We have a family NFA trust and me and the old man are trying to do several at one time to simplify things.