I have notice this is a problem with several of the long secant ogive bullet designs, not just Bergers and to make matters worse it is excentuated when you are compressing loads. You may have to buy a special seater stem if one is available (Hornady A-max comes to mind) or have one made/modified by a machinist. In order to seat 7mm 160grn A-maxs I drilled a relief hole to clear the polymer tip then used bedding compound to form a perfect match to the ogive, worked but not ideal. Good luck.