I have a Marlin 512 that prefers sabots up to about 1700 fps. Faster sabots seemed to shoot poorly. I like the Brenneke KO Sabot (not the standard KO slug), 1 oz, 3" that were rated for 1650 fps. They were very accurate and put the hurt on deer. Farthest I ever shot one was just under 100 yds. Last time I bought them they were $12 a box of 5. Now I'm using an Indiana legal rifle, so no more toting that old 2x4.