trust me no flinch here! my guns did not like the h2k load! i use currently the winchester gold and the lightfield slugs even out of my 3.5 rifled guns mossberg and H&R! i have found most slug guns with a twist of 1in23 24 etc.... like the winchester and lightfields quite well the mossberg series with a 1in36 twist like the lightfields and the fuller profile slugs brenneke etc.... but themn again to each gun is own now i shoot at test several guns and hundereds of slugs a year through various guns i have found in the 3 m1 i have shot they liked the winchesters and the lightfields about the same at 125 yds i have shot groups with lightfeilds out of my H&R that are around 1.5 at 100yds from the bench 5 shot group but then again it is ported, stressed relived, has a 3 pound trigger also some of the high speed slugs do not prouduce a fast killing shot! i have yet to have any of the 7 deer shot with lightfields take a step! 2 shot with winchesters 1900fps load ran well before dropping one was a double lung another was a broadside perfect shoulder shot! go figure ! i would try the lightfields and winchesters