I had a Model 100 in 308 that jammed. What a shame because I think they are a nice rifle. I like the look and feel of them alot. A friend of mine has one in 308 that functions flawlessly. The owner of a gunshop that I used to go to had a couple 100's in 284 and he told me he never had any problems with them either. He used to shoot the 125 gr load that Winchester made. A lighter bullet may help out. The comment he made was that if the rifle started jamming, there was one spring you had to change. What spring I don't know, but this what he said.