Just got a NEW CZ 202-B Upland .410 SxS and the chambers are so tight you can hardly chamber a shell. I have a Browning Citori Lightweight that takes all of my hulls without a problem, but not the CZ. According to MEC, Lymans and SAAMI specs the sizing of a .410 base should be .478" minimum for 2 1/2" chambers and larger for 3". I have green Remington hulls with that diameter that don't even get pass the extractors. My Win (old style) and Federal hulls measure at .475 and will fit with a hard push BUT only in 1 barrel, can't load both barrels and difficult to remove. Even when you are able to load with Win (new style HS) @ .474" it is hard to remove after firing, I mean difficult. Chamber measures at .474". Anybody else have this problem? I'm going to check my other 410's for a comparison and will report back. My measurements may be off by .001 that's why the Federals fit with a hard push, not sure, but things are still to tight (using a micrometer & small hole gauge).
Just measured my Browning O/U and older Spanish SxS, both had chambers at .480"-.481", well above the minimum. I'm going to call CZ now. Win HS were new and others were reloads that my Browning had no problem with.
Last edited by YooperJ; 06/02/14 12:56 PM. Reason: spelling
