I was talking to Berger for possible loads for a 270wsm hunting rifle using their 170gr. Their man mentioned an overall length aprox. 1/10" longer than my current mag length. The bullet's ojive(?) is inside the case neck 1/10", leaving .155" of the bearing surface secure in the neck. Bullet dia. is .273 at case mouth. Besides case volume loss, and jump to lands, is there any reason to worry about function? New territory for me.