I have only been reloading for about 2 years...not near as long as some you, but I was thinking the other day about case length and have a newb question. How important are case trimmers? I can see, if I have brand new brass, I may want the case length to be close, but otherwise, what difference does it make? When making final adjustments for a full round, I am not measuring the case, its the OAL. Pressure would be the same, wouldn't it? The case may be a bit longer, but the bullet seats just as far as a properly trimmed case, right? I have a case trimmer for my 357 and have yet to use it. Can't seem to find one (at the moment) for my 303 Brit or 8mm Mauser. Your thoughts? I don't own semi-automatics (that I reload for anyway), so perhaps a slightly longer case may get caught up and jam? Hence the need for a case trim?