Is there a downside to installing a Wyatt's Extended Mag Box?

benchracer

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I am considering the purchase of a new production Winchester Model 70 in .338WM. If I decide to go through with it, I intend to have a Wyatt's Extended Mag Box installed to allow me to load bullets like those offered by Cutting Edge and still be able to feed from the magazine.

Is there a down side to having this done?

Are there any issues regarding this that I should be aware of before I decide to go that route?
 

benchracer

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I am taking the lack of response to my question as an indication that no one has had any problems related to having an extended mag box installed. I will proceed then , at some point, with my plans.
 

HARPERC

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No input but followed along as I have the same question. Hopefully bringing it back around catches the eye of someone who knows.
 

Tikkamike

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I have had them put in several rifles that I have shot before and after and never seen any affect on accuracy good or bad. Although you are taking metal out so it is weakening the action to some degree. I have had it done in a 300 win 2 300 ultras and a 375 ultra. I would think if it were gonna be a problem I would have seen it in my 375
 

HARPERC

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Thanks Mike, I'm replacing the stock on my 338 RUM. I don't need the length currently but this is the 3rd barrel. Thinking maybe just do it all at the same time who knows what the future holds.
 

benchracer

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Thanks, Tikkamike, for your feedback.

My concerns involve the amount of metal removed, smoothness and reliability of feeding after the modification, and the fit of the bottom metal after modification (hindsight, guess I should have stated that up front).

I am glad to know that this modification has worked well in your rifles. I would have to agree that if you didn't have problems in your .375, the mod is probably pretty solid.

Thanks again!
 

highridge1

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I have had great success with the wyatt box in rem 700's but have heard of feeding problems in model 70's
 

Hookturnr

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As for fit, finish, functionality, I have no problems with this mod. Now, I have a philosophy of K.I.S.S. and it's just something else to go wrong. I have one on my 300RUM and it is nice but I have also found I can load the heavies in it at about max mag length and still get superb accuracy. I used standard BDL BM on my 280AI to eliminate the possibility of forgetting or losing a magazine in the mountains and finding myself bareassed up there. I'd like to say it will never happen but I have seen it happen personally both ways so I chose to eliminate that possibility with my next build. Just something to consider...
 

mindcrime

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Installed one on my Darrell Holland built LR 6mm Ackley (1-7" Lilja, flinging the 107 Sierra easily into 1/2 MOA AT 1K!) on a Rem700 short action. VERY PLEASED that now I can seat the bullet out to match the cartridge capacity, instead of using the 243/308 length, PLUS Kevin (the owner) is a great fella to do business with! Highly recommended for those LONG cartridges, short or long action! :)
 
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