Always keep track of where your body parts are compared to where your chainsaw bar is. Both my brother + my Nephew have cut their boots (but luckily not their feet).
A 300 Win Mag can be very accurate, and many were used in 1,000 yd matches where the big powder base came in handy. However, because the casing has both a belt and a shoulder, there are two areas that have to head space perfectly to achieve max accuracy. With advances in bullet manufacturing, most shooters currently prefer the lower recoil of a smaller caliber (6.5 becoming very popular).
Fire forming brass and shooting it with just a neck sizing will often cut the size of my groups in half compared to factory load or fully sized (or new) brass. I prefer to hunt with once fired neck sized brass. Actually, I generally don't use a neck sizing die. I just loosen the full size die a bit so the base of the neck fits firmly in the chamber. IMO, you will get the best accuracy doing that. (The die only sizes about 7/8 of the neck).