I have been happy with the sim limbsaver recoil pad. All my hunting rifles wear either a sims or pachymer, it has nothing to do with use in the field but everything to do with getting to that point. I do the majority of my load testing in the warm weather well in advance of the approaching season, this usually means t-shirts and bug spray here on the prairie's! So the ability to work through my loads with comfort is welcomed. Also I suffer from a bad shooting wing that has seen multiple surgeries, these pads as well help meremain productive following my range time.

To the question if you can't find a pre-fit in the sims, R3 or pachymer for your 870 then I as well suggest a grind to fit. Worth the investment IMHO.