I suspect that you may be correct that the 250-gr. bullets have to be seated fairly deeply.
According to Woodleigh's site, the 250-gr. bullet is 1.356 inches long, which is quite long...
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.