Was curious why the 6.5X47 Lapua uses a small rifle primer. I see, according to the Vhitavouri reloading manual, with a 123 grain bullet, max loads call for 36-40 grains of powder. About the same as a .22-250. Seems like a lot for a small rifle primer. But, I figure the guys at Lapua know a bit more about internal ballistics than I do, so they must've had a good reason. Do most of the BR and PPC cartridges use small primers too?