OK so looking at Nsa slugs the 55 gr is Length is 0.485" so it is too long but the 43 gr is .398 so it would shoot this .depth of magazine , as I like shooting heavier slugs I am going to assume same length if so 38 grain is Length is .438" so this should work , and I love shooting my Mp slugs in my edguns and taipans , they are about Length i428 and in 25 cal they are same owl so should shoot them fine ,
my thoughts are in the 30 cal if you get the rattler and mag is same then you can shoot the NSA 66,5 gr , I used this slug in my r5 30 can and my evol 30 cal , but the rattler can put out 175fpe this is alot more power then any 30 cal I owned pushes them to about 900fps or 115fpe , but the rattler would push them to 1097 almost 1100fps this would be able to devistate coyotes much further distances , I just dropped a few yotes with Evol out to 95 yards aprox and it drops them in tracks ,
I would really love to hear with anyone shooting slugs in the 22 to 30 cals with groups and just how slugs are shooting I never shot one nor do I know anyone who owns one . I dont want to sell of my proven yote rig and find it doesnt shoot slugs accurately as it would be a coyote gun , I am still thinking the sidewinder which is 125fpe as it is better for carrying in woods , shot count doesnt matter much to me it is carry ability and accuracy and dependability