Bought a BPS in 20ga last season and have been using it more than the 12 for ducks. Last season I shot Kent Fasteel in 3" pretty well exclusively and never had an issue. This season I tracked down and bought a case of Upland Fasteel 2 3/4" and have been shooting it in 5's. About 10 days ago I fired on a woody and the action locked up with the spent shell in the chamber... it wouldn't budge. I thought maybe I got a hot round and the brass swelled (or something) and gave the butt a hit on the ground and that freed it up, but left the hull in the chamber (weird). When I cycled the action again it ejected the casing like nothing ever happened. No marks on the brass when inspected. This weekend it happened again. Again, a mild hit on the ground freed it up, this time it pulled the casing back without having to cycle again. This is twice now in maybe a box of shells (probably less). I have no idea what's causing this? The gun still looks new.. very clean, not a speck of rust. I put maybe 100 rounds of 3 inchers through it last year without even a hiccup. This has only happened with the 2 3/4" Kents, which also have shorter brass than their 3" counterparts. Thoughts?