Originally Posted by Darcey
So if i neck size and do the bump when needed how often do I full length size or do I have to at all? .
Again, you cannot use a neck size only die to bump the shoulder. The Redding body die, or any F/L die, is what you need. When chambering a round, if the bolt goes down with a great deal of effort, it means the shoulder has expanded excessively, and its time to bump it back a tiny bit, usually .001" or .002" is enough. You need a caliper and devise to fit over half the shoulder to measure how far down you are bumping. You can find these in the Sinclair catalog. Turn the die down about 1/32" at a time, measure, and try in your rifle. Keep doing this until bolt closes with just a very slight resistance. If bolt flops down, you pushed the shoulder back too far. This creates excessive headspace. I throw those cases away. Many will shoot them to move the shoulder out again, but that is risky.