Elite Refuge Member
- Sep 13, 2014
- Reaction score
General rule; felt or spacers under shot reduce pressure, spacers over shot would increase pressure. This has been discussed by a few guys who reload and test.I’ve used felt spacers under and over on 12ga HW13 loads and found significant drop in FPS with additional felt on the bottom of the shot, not sure how others types of spacers might or might not effect FPS and pressure. I’ve used two felt on top as a spacer without any adverse affect on patterns, with my 12ga loads. I am working up .410 loads now.
I’m more concerned with pellet setback in wad bases, which I have found in TSP and CSD wads. I’ve never found pellets lodged in wad bases with Foam, wax, or spacers on the bottom.