[Jerry45]

I could not get anywhere near the rifling in either of my stock Remingtons, 30-06 and 308. It didn't matter how long or short bullets were loaded. Only thing that made a difference was powder and powder charge. In my CZ Varmint .223 I can load touching the lands with plenty bullet seated in the case neck. It likes bullets either 0.002 or 0.040 off the lands. Anywhere in-between or longer and groups open up. Both of my custom barreled Remington 308s like bullets 0.002 to 0.005 off the lands. Any farther off the lands and groups start opening up. All fall within magazine length.

In my experience rifles with long necks bullet seating depth doesn't seem to make much difference. In rifles with shorter necks it can make a big difference in group size.