Weatherby Mark V
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Dr. Vette
Well-Known Member
That still doesn't tell us which magazine is in your rifle, and if you could easily modify it.
Picture?
Capt RB
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The Mark V 9lug action is the same for the 257 wby as it is for the 378 case size. The mag box is changed for the different length as is the bolt stop.. Like Dr Vette said post up some pics of your magazine box so we can better advise you on the next step.
Capt RB
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The coal of the 378wby is 3.785 and the 30/378 is 3.750 Both are used in the same mark V action. A mag box to accommodate that length as well as a bolt stop are available for the action. Figuring out what you have is as simple as using a tape measure for a rough and a pair of calipers for a finer measurement.
Buckys
Well-Known Member
You might want to try the Weatherby branded ammo ... 180 accubond and 200 eldx ... or other premium factory ammo like Nosler or Norma.
Dr. Richard Gray
Well-Known Member
The COL of the WBY 300 Mag is 3.560. Mic your factory 215 gr Berger loads and if they exceed the 3.560 your going to have problems. That stands to reason, it doesn't matter 6 lug or 9 lug.
Dr. Richard Gray
Well-Known Member
If you are not familiar with https://load-data.nosler.com then introduce yourself and get the load data you need for shooting. Nosler has provided a goto source for shooters like you and me.
I believe the Bergers OAL is about 3.7". I would only be using the ammo for some long range shooting not hunting so I wouldn't mind loading each one individually. However in a hunting situation that's a problem
Sorry it took forever to reply. I got some measurements from the mag box. It measured out to be about 3.5". I think the problem is the magazine follower. I think it's too short
