I have a 26inch Hastings barrel (with the compensator) on my 870 12ga and could only get it to group heavier sabots well. I ended up going with Lightfield Hybrid Expanders (1.25 oz) and can get 1 to 1.5 inch groups at 50 yards. The Winchester BRI sabots also shot well out of it. Could not get any of the HOT (Partitions, Platinum Tips, H2K's, etc..) sabots to group worth a darn. I think it has something to do with the twist rate not being high enough to stabilize the lighter sabots at the higher velocities, just a guess though....