It really likes a 7" ROT, and you'll likely have to taper-draw the curve of the ogive right where it blends with the parallel portion of the nose in order to achieve a sane seating depth in a .308. Most throatless .30-30s.....forget it, no way will it chamber unless the rifle is pretty worn. The nose will cast a bit fat. If your bores are smaller than .302" just past the throat, you may have to nose-size. It will stabilize in a 10" ROT barrel but may not shoot as accurately as you like unless it fits your rifles very well.