77gr Sierra MK load recipe?

[Aberration79]

I just worked up 50. 22.8-23.6 using TAC. Looking to see about borrowing a chronograph before I go test em.

[Nathan_Mack]

My pet load for 77gr Mk262ish ammo runs off of 8208 XBR. It's a little on the fast side compared to what is rumored to be the real 262 powder. So I only get to about 2730-2740 fps out of a 20" barrel. That's plenty of velocity for me and gets the bullet to 1000 yards accurately.

My charge is 23.4 gr. This should be worked up to, if anyone tries it, as it is over published max.

77gr SMK run in the .380~.390 BC range, so I am curious at 1000 yards since velocities are very trans-sonic what kind of accuracy at 1000 yards you are getting?

[markm]

77gr SMK run in the .380~.390 BC range, so I am curious at 1000 yards since velocities are very trans-sonic what kind of accuracy at 1000 yards you are getting?

Great accuracy. When there's no wind, we can smack a 15" rock at 1076 yards 3 out of 3 times with a 20" Rem 700. The bullets really go through transonic nicely. No fanning at all. Granted it's largely for fun only, but the bullets handle it well.

[Nathan_Mack]

Great accuracy. When there's no wind, we can smack a 15" rock at 1076 yards 3 out of 3 times with a 20" Rem 700. The bullets really go through transonic nicely. No fanning at all. Granted it's largely for fun only, but the bullets handle it well.

That's damn impressive considering that at below 1500 fps the BC is about .300.

Curiously, I am excited to try out the Prvi Partisan 75gr ammo I bought to break in my SPR. It's not hand loaded ammo or factory match ammo, but I am expecting decent reaults.

[markm]

The PRVI is more of a hollow point bullet than an OTM. They should shoot 1.5 MOA or so. I've hand loaded the bullets and could never get them under MOA. I've shot them into water jugs and they open up like a hollow point compared to the OTMs that frag. I keep a bunch of the 75 PRVI handloaded as stash ammo. It's definitely better than M193 or M855.