Lots of ways to do this, Varget, RL-15, N133, H335, IMR 8208, 2520, Benchmark, Tac, on and on. Pick one, use which ever you have on hand. I like the 69 SMK, but nothing wrong with the Hornaday 68. If it is a 1 in 7 I wouldn't use the Nosler 69 as I've had them come apart.
Here is some sage advice from asbestosglove: "There is no need to test it. Put anyones match 68 or 69 over 25grs. Varget loaded mag length and shoot it. Put anyones 75-77 grainer over 24.5grs Varget loaded mag length and shoot it. Rinse, repeat."
...and 250 69gr Nosler MHPBTs using BLC(2) [I had a pound I had to get rid of].
Intersting though, I did not know the BLC2 and H335 are temperature sensitive. That's why I started using Reloader-15 and Reloader-22 in some of my applications. (375 H&H and 300WM)
Prior to that I was using Vitha Vouri for most stuff...
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Grand</div><div class="ubbcode-body">Here is some sage advice from asbestosglove: "There is no need to test it. Put anyones match 68 or 69 over 25grs. Varget loaded mag length and shoot it. Put anyones 75-77 grainer over 24.5grs Varget loaded mag length and shoot it. Rinse, repeat."
If varget does not work, try RL15.
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This.
Look up Sierra loading manual specifically for AR's as well as white oak armaments reloading stuff. But I tried both varget and RL15 using the 69SMK, 77SMK, 65Game King, and they seemed to shoot right along side each other out to 200(as far as i went) I finally got a decent trigger in it so I'm sure itll do better than the .75 mine was shooting before now.