I also recently bought a SBEII, black, comfortech. I had no idea that i had to shoot heavy loads to break it in. I think i probably put 150 2.75s through it and it started to malfunction, mostly just not throwing the shells out. Then i blasted about 20 or so 3.5 BBB through it and now it hasnt missed a beat. Its got about 800-1000 shells through it and it hasn't malfunctioned.