Just my opinion, for however much (or little) it's worth. The 80 grain, and most other "super heavies" are best suited to rounds like the .22-250. Theres a 77 grainer specifically made for 5.56 military sniper ammo and it should be good to go. The other super heavies......not so much.
The Mk 262 sniper ammo is loaded by Black Hills with the 77 Gr Sierra MK bullet.
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Last edited by locutus; 03-09-2013 at 07:28 PM.