Call Mec - they'll take care of you. I worked up a load of 20.5grs of PB and 1oz with the Rem SP-10 - shot great without the recoil. Also made one up with fiber wads but it took 2 1/2 filler wads to bring the shot up high enough to crimp. Didn't like that. That load is the same for 12ga so 10ga load should have a lot less pressure.
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Paul Harm
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