Me too, Made full choke open to imp cly from my test with the spread-r wads with 7/8 ths oz loads the load perfect in rem.sts type hull in 12 ga

Agree with Andy. I've read/heard that there is no significant pressure change with the SpredR-X, just drop the payload by 1/8 oz. If one was curious, they could weigh a SpredRX, and see how close it comes to 1/8 oz--personally, I am not that curious.

I had to know, 6 grains for the 10-12 ga. I use MEC loaders and they are calibrated for soft shot which is heavier than high antimony chilled shot therefore they all throw light. I do not believe the addition of this makes any difference at all as far as weight or pressure.YMMV.