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Idea
Thanks all for your replies. I have an idea to modify a Possum Hollow case trimmer for .300. They datum off the case shoulder so you just stab the case in with your fingers until it quicks cutting and you have your length. What would be real nice is to part off on the lathe holding with the bottoming collet and while its still spinning in the chuck to stab the trimmer over the case neck for the final precise cut. This was my plan from the beginning but others mentioned that a full length resize after the rough trim was necessary to fully square things up. I have used a .223 Possum Hollow trimmer before I got my Dillon trimmer (which won't work w/o a lot of mods) and it worked fast and accurate. Maybe Possum Hollow would make a batch for us to save that effort too?
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Threaded Mode