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What to do with Mark V
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<blockquote data-quote="MontanaRifleman" data-source="post: 842486" data-attributes="member: 11717"><p>Mud,</p><p></p><p>Actually the 300 WBY has a .511 (or .513 depending on your source) base diameter and the standard .532 bolt face/rim diameter that the other 375 H&H belted prodigy have. That said, you are correct that the 378 variants have a larger .579 bolt face which is about .010 smaller than the Lapua which I just learned by looking it up <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> So that is really not that big a diff. That said, i would still go with a custom action. Some things just bug me, and the 9 little lugs on the Mark V's bug me. I was actually considering using them for some of the builds I just did as well as a 339 LM Imp and after a chat with Kirby, i decided against it. Now let me make this very clear since I have used Kirby's name... He did not say the Mark v was a bad action or that it could not be used for a Lapua build... he did say the 9 lugs were an issue as far as getting them all perfectly lapped and also said a beefy custom action was better or more suited for chambering a Lapua. My current smith also agreed about the 9 lug issue and tells anyone who wants to use a Mark V for a build, that he only guarantees 1 lug of of the 3 in line will fully contact the receiver. Maybe more but only guarantees 1.</p><p></p><p>Last, If I were to ever design and build my own actions, I would use the Mark V as the model. The only thing I would do different is to change the 9 itty bitty lugs to 3 beefy lugs like my Sako 85 and use the same CRF design. Everything else would be identical to the Mark V, except that I would also offer a longer version for longer cartridges like the RUMs</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 842486, member: 11717"] Mud, Actually the 300 WBY has a .511 (or .513 depending on your source) base diameter and the standard .532 bolt face/rim diameter that the other 375 H&H belted prodigy have. That said, you are correct that the 378 variants have a larger .579 bolt face which is about .010 smaller than the Lapua which I just learned by looking it up :) So that is really not that big a diff. That said, i would still go with a custom action. Some things just bug me, and the 9 little lugs on the Mark V's bug me. I was actually considering using them for some of the builds I just did as well as a 339 LM Imp and after a chat with Kirby, i decided against it. Now let me make this very clear since I have used Kirby's name... He did not say the Mark v was a bad action or that it could not be used for a Lapua build... he did say the 9 lugs were an issue as far as getting them all perfectly lapped and also said a beefy custom action was better or more suited for chambering a Lapua. My current smith also agreed about the 9 lug issue and tells anyone who wants to use a Mark V for a build, that he only guarantees 1 lug of of the 3 in line will fully contact the receiver. Maybe more but only guarantees 1. Last, If I were to ever design and build my own actions, I would use the Mark V as the model. The only thing I would do different is to change the 9 itty bitty lugs to 3 beefy lugs like my Sako 85 and use the same CRF design. Everything else would be identical to the Mark V, except that I would also offer a longer version for longer cartridges like the RUMs [/QUOTE]
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