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Extending Magazine Box and Setting the Throat

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Unread 04-08-2010, 10:50 AM
Silver Member
Join Date: Jul 2009
Posts: 219
Extending Magazine Box and Setting the Throat

I don't know if others have read my other post but here it is below.

Proper Twist 300 WM ?

Ridge Runner, indicated that maybe what I need is a Wyatt magazine extender. I've looked into them and it appears that it's exactly what I need.

The magazine extender will allow me to load to an OAL of 3.85" Which is huge. Going this route would essentially allow me to set the throat any where I want with the bullets I've chosen, 165gr & 180gr Accubonds and the 208gr A-Max.

I hear that the rule is you should sink the caliber, in my case .308" into the case. The neck on a 300 WM should be about .2638" so the base of the bullet at .308" in will already be inside the shoulder area about .044".

So when I make these dummy rounds how far should I stick the bullet into the case?

I know I will have to choose one bullet to throat to but for now I just want to know from an accuracy/safety perspective how I should be setting the bullet sink depth in order to get heading in the right direction.


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Unread 04-08-2010, 03:46 PM
Gold Member
Join Date: Dec 2002
Location: mathias wv
Posts: 987
Re: Extending Magazine Box and Setting the Throat

Tom the longer you throat your rifle, the less you can chase the lands as the throat erodes. so I wouldn't go too long. however the longer you throat it the more case capacity you have, kind of a catch 22 situation. I'd allow some room in the magbox for lands chasing if it were me. wish I could give ya some numbers but I'm not than familuar with the 300 winny.
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