I have a pair of 541s, one a "S" and one a "T" model. The "S" model seems to have a very tight chamber. On certain brands of ammo, it will not extract the empty casing. The extractors just slip over the rim. It is also hard to get the bolt to battery on a cartridge. Seems as though it may be engaging the lands. I can not verify that because I can not chamber a round and then extract it without the extractors slipping over the rim. The difficult ones that I have found are Federal 711B, with the dimple and Browning 37 grain hollow point. I have no problems with the 541-T. Anyone else experience this?