On the way out of the office for a few days (season opener) so gotta make it short... as for seating i used an old rcbs (closed end) seating die to push the capsules in to basically "settle" the powder, not necessarily compress it but it is "held" in place. Suppose that it was simply an expedient cause of the length, I think abt any old way (including finger pressure) to push the capsule into the case is OK. I crimped em but, Not Too Hard... they are fragile... As for what to use 'em on ... they are at least as effective as a 410 on bunnies, blackbirds, red squirrels, and (the one I hunt most) arial targets, like clay birds!! for rats in the barn I have settled on the double action 44 special w/ single length speer capsules, and #7 1/2 shot. Double action cause there are always more than 1, and the 44 cause a 357/38 w/ speer shot capsules won't kill a Mid Michigan barnyard rat on the spot, like the 44 will .. even w/ multiple hits ....Have a good one ... see ya'll in a few days .. marty