I have 2, 1 stevens that started as a 243. 1 model 12 that was a 308. Same mag box. Both are center feed and cycle 6BR fine. I have only shot either off the bench and more into saving brass than cycling the bolt rapidly. The only problem I have is with the extractor bearing. It needs to be larger and I have'nt changed them yet. Empty brass wants to fall out of extractor jaw and lay in front of bolt most of the time with both. lapua brass, 105 a-max. Bill
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