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There are many good trimmers out there, and again, money will buy you convenience. If you happen to trim a lot of brass, either the Dillon trimmer on the press or a Giraud, IMO are at the top of the convenience (and price) list. They are not necessary, but most trimmers will get tiresome pretty quickly after a few hundred cases.
Another drill mounted trimmer besides the Little Crow is Giraud's Tri-Way trimmer http://www.giraudtool.com/Tri%20Way%20Trimmer.htm
My advice would be to stick with .40 S&W till you get comfortable. There are people who will process rifle brass for you for a fee. Depending on your needs, that may be the best route.
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Don't think you'll save money by going cheap. Buying two will always be more expensive than just buying the one you will eventually have anyway. I wish I'd learned that earlier. Now I have two of most things, a cheap one that I don't use anymore, and the good one I finally bought.
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Read, read, read....
Hope this helps...
http://www.glocktalk.com/forums/show....php?t=1343188
PM me if you have any sticking points.