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mark 5 action

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Unread 10-07-2010, 11:34 AM
Junior Member
Join Date: Sep 2010
Posts: 26
mark 5 action

Hey guys is there anybody out there useing the weatherby mark 5 action as a platform fo a custom build?
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Unread 10-07-2010, 01:56 PM
B23 B23 is offline
Platinum Member
Join Date: Oct 2008
Location: Spokane, Wa.
Posts: 1,078
Re: mark 5 action

I'm not a gunsmith but I am an owner of some Weatherby's with their MkV action and I'm not sure if this is exactly the information you're looking for but I'll pass on what I've learned and you can go from there.

Right wrong or indifferent, Weatherby's MkV action is NOT going to be the first choice for a build platform of more gunsmiths than not. In fact, you will probably find a few smiths that won't build on them at all. Now that doesn't mean they are a bad action, just that some don't like to play with them for one reason or the other.

One of the biggest concerns I hear from the gunsmiths I've talked to was they struggle to feel confident all 9 lugs, even after lapping, are/were contacting the same. Other than that, I believe they can be trued pretty much the same as any other action.

IMHO, if you are serious about building on a MkV you should look for a gunsmith that LIKES to build off of this platform. JE Custom and Kevin Cram are two that come to mind and not only are they great supporters of this Forum but I have personally talked to both and both these guys were excellent to deal with.

There are quite a few guys on this forum that have built semi customs around the MkV action with great results.

Autorotate is on this site and he has a couple semi customs built on MkV's. Look him up and he can probably give you much more information than I. He wears a white lab coat and reloads in a vacuum sealed environmentally controlled lab and, wellll, I think he's a little OCDish too but shhhhh, don't tell him because he still thinks he's normal.

None the less he is great to chat with about his MkV builds.
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Unread 10-08-2010, 12:44 AM
Gold Member
Join Date: Apr 2007
Location: ALASKA
Posts: 504
Re: mark 5 action

B23....why don't you go uniform some meplats, and double check your weight sorted primers....your scale could've been off when you did that last time......and leave me alone.....sheez. There are some crazy OCD people on this site. He is right though about one thing....about me being perfectly normal

30-338 Lapua, you can get the whole story here

338 LMAI, built by Joe Starnes

338 Excalibur, built from a very knowledgeable and skilled LRH gunsmith.

The guy I would talk to is "Broz".....he's cranking cold bore hits out of his MKV where most commercial range finders run out of steam, and has bagged many critters at distance with his rig.

Another is "Long Time Long Ranger"......

B23 is right...if you already have a donor action....use this thread to find you a 'smith for it. Don't force that action on your smith.
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Unread 10-08-2010, 09:39 AM
Platinum Member
Join Date: Mar 2002
Location: Wyoming
Posts: 2,612
Re: mark 5 action

The MK 5 wby action is the best action available for a rifle build if your are considering a large magnum build. If you can find one this is your best option. Just carry it to a top gunsmith that knows wby actions. One tip is if the smith starts knocking the wby action move on because that shows he has a bit to learn and I wouldn't have him touch my rifle.
Predictions are difficult, especially when they involve the future
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Unread 10-08-2010, 02:15 PM
Bronze Member
Join Date: Feb 2006
Posts: 37
Re: mark 5 action

I semi customized my Mark V rifle. The darn thing was very inconsistant. Sometimes the groups were acceptable and sometimes they were just terrible. This is a 340 WM and I like the caliber. I put on a McMillan sporter type stock and had the local gunsmith bed the action. No improvement, but my gunsmith had a bore scope in the shop and, after inspection, we found out that the barrel was the culprit. It then had the the action trued and the bolt squared. My gunsmith elected to skip trying to lap the lugs indicating the futility of such a venture. I am in the process of breaking in the barrel and hope to be able to use it for (semi) long range shooting. I am using a Leupold M-4 scope with a Holland ART reticle.

One problem with the Mark V action is the lack of after market stuff. Also the action is not as easy to accurize as other actions. The action can be modified for cartridges as long as the 378 Weatherby if you use Weatherby parts and modify the bolt stop. This would allow you to modify the bold face and chamber for a 338 Lapua, 338 Norma, or any case based on the 378 Weatherby. If I were to do it over again on a Mark V action, I would probably use a heavier, longer barrel and a McMillan A-5 stock, keep the bolt face stock, add a longer magazine, lengthen the bolt travel, and chamber for 338 Edge. If you are not interested in taking shots longer than 500-700 yards, or if you do not want to lug a 12-15 pound in the field choose whatever caliber that you had in mind and stick with a thinner 26" barrel.

Good Luck
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Unread 10-08-2010, 11:37 PM
Platinum Member
Join Date: Feb 2007
Location: Townsend, Montana.
Posts: 8,651
Re: mark 5 action

Joe Starnes built my 338 Lapua on a Mark V action as Autorotate indicated. The mark V will easily accomodate larger cases that some actions will not. I don't think you will find a better factory action if a fat case is in the plan.

Joe Starnes built my Lapua. He is very well versed in ELR and does it on a regular basis. Actually my Lapua was a build he was going to do for his own personal rifle and he offered the parts to me and thn did the build for me. I have no regrets.

Dave Young of Youngs Gun Smithing in Tracy MT. is another Wby fan. He builds some aweome 34" 338-378's in a V-block floated action the send big bullets at some steller speeds. Again on the Mark V actions.

I have not had any problem finding good smiths to build on one and I would have no problem doing another.

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Unread 10-09-2010, 07:45 PM
Junior Member
Join Date: Sep 2008
Posts: 29
Re: mark 5 action

I built my custom on a Mark V. It is in the pictures section. It did take quite awhile to get the lugs all lapped, but I'm quite happy with the result.
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