77gr smk 11.5” barrel

[ubet]

I’m getting 2280 with my hand loaded 77gr smk. Is that going to be enough velocity and energy for expansion to 200yds?


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[ColtSeavers]

According to Black Hills, the 77 gr TMK round will reliably fragments at 1900 fps velocity.

https://www.thefirearmblog.com/blog/...n-5-56mm-ammo/

[vicious_cb]

https://www.thefirearmblog.com/blog/...n-5-56mm-ammo/

Thats TMK not SMK. SMKs need ~2300-2200 fps for fragmentation. OP I would choose another bullet that isnt as velocity dependent for an SBR.

[ColtSeavers]

Thats TMK not SMK. SMKs need ~2300-2200 fps for fragmentation. OP I would choose another bullet that isnt as velocity dependent for an SBR.

My bad.

[vicious_cb]

My bad.

I mean its a good recommendation of what the OP should be using

[pointblank4445]

SMK isn't great for terminal performance anyways...nor was it ever intended to be.


Barnes TSX 70gr has an expansion threshold of 1800 fps that might be worth looking at...

[ubet]

Another question for Mark and pb. Would the 62gr Hornady hpbt be a decent option for this gun? I have 1500 of them. And I can't get the 16" to shoot them


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[PracticalRifleman]

I have an 11.5” barrel and I get around 2475 FPS. With the same load, I get 2700 FPS in my 16”. Both are BCM barrels. That load is with Varget.

With TAC I can add 50 FPS but it blows primers on hot days.

However, I have switched to loading with 8208XBR. It meters better than either and is more temperature stable than TAC. I haven’t yet chronographed it in the 11.5” but it does hit 2750 FPS in the suppressed 16” barrel and I have seen no blown primers or other pressure signs on the hottest days I’ve shot this year and last, around 100 degrees F.

I intend to start playing with a 12.5” barrel in the future; a “mini-Recce”.


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[gaijin]

100 yds, 77 gr OTM CBC/Magtech group circled (after windage adjust.).
Couple rds. of 75 gr. GD below group.
The CBC chrono'd 2450+- FPS, the 75 gr. GD ran 2380 +- FPS.
I can. and do. shoot either interchangeably to 200 yds.

This from 11.5" Sionics, an 11.5" BCM is same in regards to group(s).

[MontanaMarine]

I’m getting 2280 with my hand loaded 77gr smk. Is that going to be enough velocity and energy for expansion to 200yds?


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Paul Harrell recently tested a few different loads comparing them in 10.5" and 20" barrels for velocity, and effect at 200 yards on the meat target. He was getting 2240 fps with 77gr SMK BTHPs out of the 10.5", and expansion at 200 yards.