Sierra 69 grain SMK shoots great-TMK, not so much.....

[Mozella]

I did a LOT of testing with the 69gr TMKs in my .223 including several types of powder, different charge weights, and seating depths. I never got them to shoot as well as the 69gr SMKs. The SMKs, which I moly coat using the wet method, are my go-to bullet for my .223 with a 1:8 twist barrel. In side-by-side testing with the TMKs, the SMKs win but I don't know exactly why.