I just received my GA percision built on a Remington 700 short action magnum in 300 wsm. I went to the range on Saturday did the proper barrel break in and on about round 60 rds down the tube I couldn't close the bolt. And I found my extractor broken in the chamber. After further research I have found that I need to have a m16 style extractor installed in my opinion. Since my hunting trip is in 2 weeks I have no choice but to repair it for the time being. My question is how do I know which extractor to buy? Is there a magnum style extractor or is the large bore for .308 and 30-06 the one I use and do i use riveted or non-riveted new style. Any help would be much appreciated