Which Talley Bases for a Winchester model 70 375h&h ?

[curtism1234]

OK guys and gals, any of you really familiar with the Winchester M70 rifles?
I want to put a set of Talley QD rings on that new Winchester Safari Express .375 H&H I just bought recently. I went to the Talley website to see what they have and man am I confused. Which bases do I need for this rifle?
I'm a bit confused...
http://www.talleyrings.com/scope.php

25X701 Winchester Model 70 (.330) Post 64 Long Action Mag. EXT. Steel Bases
B $25.95
258X701 Winchester Model 70 (.330) Post 64 Long Action Mag. EXT. Steel Bases (8X40)
B $25.95
252701 Winchester Model 70 (.330) Post 64 Long Action Mag. Steel Bases
B $25.95
258701 Winchester Model 70 (.330) Post 64 Long Action Mag. Steel Bases (8x40)
B $25.95

I'm obviously more interested in the thread size - regular or 8x40

Anyone know 100% for sure?

thanks

[Headache]

curtism1234,

You probably have the standard 6-48 thread in your receiver.  You may want a gunsmith to open them up to the 8-40's to give you a little more strength.  The other choice you have, extended bases, depends on what scope you decide on.

Headache