Fast 6mm for Hunting

[treillw]

Would like to build a fast 6mm. Want to hunt with it suppressed and would like a barrel around 20". I was thinking 6 SAUM or 6 UM. What would you recommend and why? Want to shoot the 115 Dtac.

Thanks!

Edit: please add expected velocity of the 115 gn bullet from a 20" barrel - I'm ignorant to the performance of all of these different cartridges!

 

[Mark W]

I would do a 6mm-06 because I’ve always wanted one and brass is widely available.

 

[JB10]

6-284? There is an old predator hunter who swore by this cartridge.

 

[STOMP442]

6XC has done anything I have asked it to do out to some pretty incredible ranges with the 105 Hybrids. N560 worked really well for me in the last one I built and gave me about 100fps over H4350.

 

[CJ6]

6-284? There is an old predator hunter who swore by this cartridge.

The problem with a short barrel in 6-284 is you lose too much velocity. 243 AI would be a better option. BTDT.

 

[Orr89rocz]

Seems counterproductive with a 20” barrel. But the 6 UM 30 deg is available from adg brass and would be the easy button. It can get near 3200 fps out of a 20” with that bullet

 

[treillw]

Seems counterproductive with a 20” barrel. But the 6 UM 30 deg is available from adg brass and would be the easy button. It can get near 3200 fps out of a 20” with that bullet

I want to be able to sneak through the timber hunting and not blow my ear drums out. Recoil isn't a concern with a 6mm suppressed, so why not burn more powder to try to get some of the lost velocity back from the shorter barrel.

 

[martinakl]

I want to be able to sneak through the timber hunting and not blow my ear drums out. Recoil isn't a concern with a 6mm suppressed, so why not burn more powder to try to get some of the lost velocity back from the shorter barrel.

Just do it. It'll work out great. If you're in the timber, your range is limited, so a few FPS doesn't matter.

I just shot my suppressed 240 Weatherby a few days ago. *That would be similar to a 6mm-284 or 6mm-06. 24" barrel with a 6" can wasn't crazy long but I don't have that thick of timber to sneak through.

Heads up. It's still going to be loud. Not blow your ear drums out loud. But, not hearing safe. You'll really want hearing pro at the range. I have some very big, very effective suppressors, but even on my 6mm Creedmoor the supersonic crack of the bullet is technically too loud for repeated exposure. You'll knock BD's off but a big 6mm will start very high.

 

[alf]

6 PRC.....

 

[4xforfun]

6-284. Advice, go with more bbl and less suppressor if you can. I bought 9" Thunderbeast's, and should have gone with 5" and kept a few inches of BBL.......unless you are in a competition to see who's can is the quietist with your buddies, cuz you wont know the difference without a DBL meter.

Just my .02,
Tod

 

[Walt Krafft]

Accuracy trumps velocity. 6XC gives great accuracy with plenty of velocity. I shoot 115 DTACs out to 1000. Never was concerned with mv. I think it is around 3000.

 

[rickiesrevenge]

I did an 18" 6wsm. Back before lapua did wsm brass. 105s @3200 with h1000

 

[ELR LVR]

Would like to build a fast 6mm. Want to hunt with it suppressed and would like a barrel around 20". I was thinking 6 SAUM or 6 UM. What would you recommend and why? Want to shoot the 115 Dtac.

Thanks!

Edit: please add expected velocity of the 115 gn bullet from a 20" barrel - I'm ignorant to the performance of all of these different cartridges!

6x284
Why?
capable of 1000 ft/lbs at 1000 yds without blowing bullets and only needs an 8 Tw
115's at 3400 fps
with only 51-53 grns of powder with the right barrel length
1.5" to 2" groups at 600 (1/3 or less MOA accuracy)

 

[SD guy]

Rather fast 7.5 twist bolt action 6mm ARC pushing a 90 gr CX has been plenty fast for my use. 2900 fps with the 90 gr CX has performed well in my experience. Have also used the 108 gr Elite hunter with good results. Think I was doing 2780 fps with that one. 22" Pac-nor barrel has treated me well on the CZ527.

 

[Cloudrepair]

My vote would be for the 6saum i have a 6.5 7 and a 300 all of them are great performers . Love that cartridge.

 

[AWS]

243 WSSM

 

[dantiff2]

My vote would be for the 6saum i have a 6.5 7 and a 300 all of them are great performers . Love that cartridge.

6 saum would be awesome for all 500 rounds before barrel setback BAHAHAHAHA

 

[Gary in MD]

Since these threads are usually all about everyone’s favorite…
I’m shooting the 80 grain TTSX @3700+ in my 240 Wby right now, it’s shoots fine with the 105 Berger also. It’s loud and fast with the 26” barrel! LOL

 

[357Mag]

TreillW-

Howdy!

I’m looking at muzzle velocity and “ expansion ratio “ ( ER ) charts provided by ballistician Homer Powley ( “ The Powley Papers, Guns & Ammo 1974 Annual )…..

General info:
For an example 6mm caliber 28” barrel, Powley listed an expansion ratio of 4.
Powley’s chart suggested a powder charge wt of 75gr max ( IMR powders used ).
I point out….Homer did not bother listing expansion ratios below 4, likely because such ER’s indicate a gun that is comparatively inefficient @ converting chemical energy into kinetic energy.

Additional info:
Powley listed a Mv of 3,890fps being achievable, when shooting an 85gr 6mm bullet; from a gun w/ a 26” barrel giving an expansion ratio of 4.


With regards,
357Mag

 

[Truckbed]

I know you said a 6mm, but to me the large capacity 6mm cases are not a great match for a 20” barrel. Consider a 25x47 L or 250 savage 10 twist, something in that neighborhood. You could efficiently hurl 100-120gr bullets and have a great hunting round! —Wendel