The 6.5 m/s carbine that I enjoy shooting the most likes IMR 4064 and the Sierra 160 gr RN. This load shoots well and also works perfectly for the barrel sights as issued. It was built in 1912 and seems to have about .002 larger groove dia. than the std. .264. I should try the Norma Oryx or the Lapua Mega bullets but have a couple life time supplies of the Sierra bullets so not a lot of incentive to experiment.
