i have never had any problem with my 300 Win . mag . but i always check at least 3 different reloading books when loading i bet he has to much powder above ,plus the old rule of thumb start low and work your way up . i own 7 different cartridges in BLR rifles all work just fine . the only BLR i kinda don`t care to shoot much anymore is the 300 Win. mag. the reason is the recoil and i get a headach now days.
