My 6.5/06 die is custom on a newlon blank. The 300 WSM
is redding FL sizer and shoulder bump die with forester bonanza br seater. My 338 AI is Neil Jones set and my 6mm BRH (6 BR w/shoulder blown forward .180) is also neil jones. My 300 win mag is Forester BR set with JLC bushing converion and on and on.
I only use either Redding comps, Forester BR sets with JLC (Jim Carstenson, advertises in Precision shooting) bushing conversions ($35)or Neil Jones custom sets ($275.
You are not neck turning, I am think you will find once you buy a neck turner (get the K & M tool(Advertises in precision shooting and is best) with the carbide donut pilot, that your problems will disappear. after turning just enough to clean up the high spots measure loaded round and order a bushing .002 under loaded round size. Be sure and order the expanding mandrel to match the pilot. Use imperial die wax or a good lube on inside of necks and outside. Use power screw drivers with Sinclair shell holders for power drivers to get an even and smooth cut. If you do it by hand, it will leave grooves. Much quicker to use the B & D powerscrewdrivers with interchangable batteries. Will get about 20-40 cases per battery, so have extra batteries.
Lapua is the best brass, and always my first choice, but even they have variances in the neck. Only way to get rid is to neck turn to at least some degree.