I've just bought a 12 gauge with 2.5 inch chambers. Can my Mec 600jr be adjusted to load two and a half inch cartridges? I don't have the owners manual anymore. If it can what do I have to do to adjust it? Can I cut a 1/4 inch off Winchester AA cases and load them as 2.5 inch cases? Two and a half inch cases are rather uncommon here, those that are sometimes available are imported from the UK and considerably more expensive than locally made 2 and 3/4 cased ammo. Also can you recommend what wads should I use. I want to shoot one ounce or 7/8 oz loads for rabbits and informal clays. Many thanks for any advice.