400 Legend

[MachIVshooter]

Much of the .350 Legend appeal is the ability to suppress well with 250 gr & heavier subsonic loads.

There's an interesting phenomenon that occurs once you move above the .375 bore size, making big bores much more difficult to suppress. I don't have a scientific explanation for it, but it's a very real challenge. 405 gr 2,015 FPS loads out of my Marlin 1895 with a 1.6x10" suppressor are louder at ear than 300 gr 2,970 FPS loads from my .375 RUM with a 1" shorter can.


That's why shotguns don't suppress well, despite being low pressure.

 

[Elkins45]

Much of the .350 Legend appeal is the ability to suppress well with 250 gr & heavier subsonic loads.

There's an interesting phenomenon that occurs once you move above the .375 bore size, making big bores much more difficult to suppress. I don't have a scientific explanation for it, but it's a very real challenge. 405 gr 2,015 FPS loads out of my Marlin 1895 with a 1.6x10" suppressor are louder at ear than 300 gr 2,970 FPS loads from my .375 RUM with a 1" shorter can.


That's why shotguns don't suppress well, despite being low pressure.

I just figure it’s basic math. You still need the same amount of clearance between the bullet and baffle but the larger the diameter of the hole the more area in the circular space between the bullet and baffle. The clearance ring around a .22 bullet covers a lot less area than the one around a .45 one. There’s just more “leakage area” around a fat bullet unless you run tighter clearances for them.

 

[21H40]

I think I'll wait for the 5000 Bushmaster. I'm pretty tapped out in 3's and 4's. I need some 5's in my collection

 

[MachIVshooter]

I just figure it’s basic math. You still need the same amount of clearance between the bullet and baffle but the larger the diameter of the hole the more area in the circular space between the bullet and baffle. The clearance ring around a .22 bullet covers a lot less area than the one around a .45 one. There’s just more “leakage area” around a fat bullet unless you run tighter clearances for them.

Eh, blow by isn't as much a thing as it would seem. Yes, gasses are traveling faster than the bullet, but they are being pushed off centerline and into the chambers by the bullet itself.

Once the bullet is no longer occluding the bore, however, they are free to travel through it, which is why features that disrupt laminar flow are so important.

The bigger the hole, the more challenging this is. But it's also not totally linear. There's just a big change that happens when the suppressor bore jumps from a ~.435 .375 cal bore to a ~.515 .458 cal bore, much, much more pronounced than the proportianatly greater increase from cans with bores to accommodate .224 to .308 or .308 to .375 cals.

 

[horsemen61]

Winchester making a .400 legend ehh I’ll have to wait and see how this one goes

 

[someguy2800]

450 legend’s coming out next week, it uses 450bm barrels, brass and dies. Everyone’s gonna be getting one…

I haven’t seen it yet but I also know it’s possible to open the neck of a .223 case to hold a 9mm.
View attachment 1131320

If you hurry you could make it the 355 Maverick

Thats called 357 AR Max. Been around for awhile. Starline makes brass.

 

[mavracer]

Much of the .350 Legend appeal is the ability to suppress well with 250 gr & heavier subsonic loads.

Too bad most barrels don't have a fast enough twist to stabilize heavier than 250gr-255gr.

 

[DM~]

I like the .360 Buckhammer best, that's what I'll be getting.

DM

 

[mcb]

Eh, blow by isn't as much a thing as it would seem. Yes, gasses are traveling faster than the bullet, but they are being pushed off centerline and into the chambers by the bullet itself.

Once the bullet is no longer occluding the bore, however, they are free to travel through it, which is why features that disrupt laminar flow are so important.

The bigger the hole, the more challenging this is. But it's also not totally linear. There's just a big change that happens when the suppressor bore jumps from a ~.435 .375 cal bore to a ~.515 .458 cal bore, much, much more pronounced than the proportianatly greater increase from cans with bores to accommodate .224 to .308 or .308 to .375 cals.

I wonder how much of that is due to it being significantly easy to maintain choked flow through a small orifice than a big one? I would think that plays some role.

 

[MachIVshooter]

I wonder how much of that is due to it being significantly easy to maintain choked flow through a small orifice than a big one? I would think that plays some role.

Except they work by diffusing the flow, giving gasses time to cool, contract and slow down in the chambers before exiting

Bigger bores make it more difficult to disrupt laminar flow, so that's a primary contributing factor, but as I said, the change in SPL to bore area is disproportionate at bores over 7/16" when gas volume and pressure are considered. There's absolutely no reason the .375 RUM burning twice the powder charge and with about 4 times the exit pressure should suppress better than the .45-70, especially in a shorter can with proportionately greater bore area relative to bullet size (.06" diametral clearance for both). But it does.

 

[someguy2800]

In my limited suppressed testing I’ve seen the same affect. 300 blackout suppresses better than 44 mag and even 9mm in my can. I expected 44 mag to suppress well because there is very little baffle clearance.

 

[jmorris]

My 458 socom is very quiet but the can is also huge. The 405’s make a lot more noise slapping the side of a pig than they do exiting the rifle.

My 300 is ok noise wise using a 762 SD on an 8.5” barrel but much better for carrying around.