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<blockquote data-quote="J E Custom" data-source="post: 389612" data-attributes="member: 2736"><p>The Mark V actions are all the same length and the shorter rounds like the 300 WM have a</p><p>spacer in the mag box that can be removed. also the bolt stop groove has to be milled a</p><p>little longer to allow the bolt to open wider. (Easy to do).</p><p></p><p>As far as the bolt face being opened that is one of the main reasons for going to a MK 5 (It</p><p>has a larger bolt face made for the 378 case head (.582 for the 378 and ,588 for the Lapua)</p><p></p><p>The extractor can be ordered from Weatherby (The 378 extractor works perfictly)and a flat </p><p>top bullet follower with the center feed box can also be ordered from Weatherby . you can get </p><p>all of this for less than $100.oo.</p><p></p><p>I hope this answered your questions.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 389612, member: 2736"] The Mark V actions are all the same length and the shorter rounds like the 300 WM have a spacer in the mag box that can be removed. also the bolt stop groove has to be milled a little longer to allow the bolt to open wider. (Easy to do). As far as the bolt face being opened that is one of the main reasons for going to a MK 5 (It has a larger bolt face made for the 378 case head (.582 for the 378 and ,588 for the Lapua) The extractor can be ordered from Weatherby (The 378 extractor works perfictly)and a flat top bullet follower with the center feed box can also be ordered from Weatherby . you can get all of this for less than $100.oo. I hope this answered your questions. J E CUSTOM [/QUOTE]
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