bought a older marlin 336 RC. bought two boxes of remington 170 gn. corelocks and two boxes of the new 160 gn. rev. the 170 gn. shot great 1" at 100 yds. the rev. primer backed out as if too much pressure. i sighted in 1" high at 100 yds with the rem. and will use them for hunting. is there such a thing as head space problems with the marlin 336?