"Yeah I know the instructions say to trim brass for X-dies to .020 so this is what I will do. "
The only effective difference in that sizer is the decapping stem; back the stem up maybe 50 thou and use the thing normally. IF I had an X sizer I'd use it normally, not as intended. And I'd never buy one.
Trimming 20 thou less than the normal 10 thou trim-to-length means the pre-trimmed cases have to stretch 30 thou before that neck deforming bumper part does anything at all. At my house, any case that stretches 30 thou would be tossed, not re-trimmed.
