That bullet is a boat tail and will not shoot well in an oversized bore. That will be the main cause of your keyholes. I was using a .328 dia flat base bullet with the load I posted. The Hornady 195 sp is a flat base and should do better than the boat tail . But if your barrel's groove dia is close to .328 , none of the modern US .323 bullets are going to do that well . The original bullet was made as a long , cupped or hollow base for a reason , to let the bullet ride the lands and keep straight . Speer used to make a .323 220 -225 grain round nose with a cupped base , that bullet does work well in most of the big bore [ .327 - .334 ] 8mm's .