I also run a 6.5x55 in a factory Tikka Varmint. My load is 47.5gr RL22, Lapua Brass, CCI250 Primers, and 140gr SMK average 2703. The ES (62) and SD (17) are higher than I'd like to see, but it shoots very well at 0.45 MOA. I've been able to narrow those numbers significantly by switching primers...