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Rifles, Reloading, Optics, Equipment
Gunsmithing
300 wby to 30-378 wby
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<blockquote data-quote="specweldtom" data-source="post: 933379" data-attributes="member: 2580"><p>Some caveats.....Several years ago, I read that bolt thrust on the .378 based cartridges is pushing the 700's safe limit. However, the MK V Wby 9 lug rifle is factory chambered for the .378 based cartridges and has centerfeed mag boxes, followers, and .378 extractors available as parts. The 700 is factory chambered for the RUM cartridges, but the mag box inside length is 3.7" and the MK V .378 box is 3.8". The extra length is useful. Also don't know if the RUM box and follower will work on the bigger belted case. Both bolt faces can be opened up from Std Mag case head diameter, but not sure if the Sako or M-16 extractor conversion will work on the larger .378 case head.</p><p></p><p>Bottom line, for a .30 x .378 I would start out with a 9 lug MK V action, not a Rem 700. However, the .300 RUM might clean up the .300 Wby chamber. Worth checking on, and the .300 Wby bolt face in the Remington works on the RUM case head without modification..........Oh yeah, RUM brass is expensive, but the Big Wby brass is insane.</p><p></p><p>Good luck, Tom</p></blockquote><p></p>
[QUOTE="specweldtom, post: 933379, member: 2580"] Some caveats.....Several years ago, I read that bolt thrust on the .378 based cartridges is pushing the 700's safe limit. However, the MK V Wby 9 lug rifle is factory chambered for the .378 based cartridges and has centerfeed mag boxes, followers, and .378 extractors available as parts. The 700 is factory chambered for the RUM cartridges, but the mag box inside length is 3.7" and the MK V .378 box is 3.8". The extra length is useful. Also don't know if the RUM box and follower will work on the bigger belted case. Both bolt faces can be opened up from Std Mag case head diameter, but not sure if the Sako or M-16 extractor conversion will work on the larger .378 case head. Bottom line, for a .30 x .378 I would start out with a 9 lug MK V action, not a Rem 700. However, the .300 RUM might clean up the .300 Wby chamber. Worth checking on, and the .300 Wby bolt face in the Remington works on the RUM case head without modification..........Oh yeah, RUM brass is expensive, but the Big Wby brass is insane. Good luck, Tom [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
300 wby to 30-378 wby
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