What are my possibilites such as 416 Rem Mag, etc that will compliment this action without a lot of extra work. Do not want larger than 458 Lott for example.

It is my understanding that the conversion to 416Rem is about as easy as can be.

You mentioned the 416 Rem. 458 Lott is also a good fit, as is the 470 capstick (which I just got delivered yesterday). Pretty much anything based on the H&H case should work. I also know that a few have done the 404 Jefferies on a H&H as well.

375 H&H
375 Wby
375 Ackley Improved
400 H&H
416 Hoffman
416 Remington
458 Lott
450 Ackley
470 Capstick
etc

However, most will require a new magazine box as your 375 H&H box will have too much taper at the front for some of those big fat bullets.

Thanks for your replies.

500 grains, does that apply to the 416 Rem as well as the others?

Sometimes. You will have to try it.

First, take the max box out, remove spring and follower.

Then take 3 416 rem cartridges and rubber band them together as if they were in a mag box. That represents how they should stack.

Then put the group of 3 rubber banded together into your mag box and see if the shoulder area is too tight. If so, then order a new mag box and follower from Ted Blackburn or Sunny Hill. Best get the extra deep box if using .458 or bigger. The Blackburn 14x box even requires additional machining to open it up for .470 capstick.

A newly made Win M70 is an easier and cheaper conversion.

Who made the action, as that will indicate what you can do.

if it is a whitworth or other interarms action, it will require minor work on the rails and ramp

if it is an FN, it is probably going to be okay

if it is a "commerical" action, it will probably be a breeze...

but, remember, you are looking at at least 600 bucks for a barrel, install, bluing.

jeffe

Can't believe I did not include that this is a pre 64 Mod 70 action and I am thinking of having the current 375 barrel bored out.

Do you know someone who will do a 375-416 rebore? I've been thinking about this for a later mod 70. Got to find a new (lighter) 375 first though.

I am hopeful that Classic Barrel and Gun Works in Arizona will do this rebore but I have not confirmed.

well, the pre-4 is a valuable gun as is.


http://www.cutrifle.com/

generally a 6 month turn around.

jeffe

..........There is a little easier way to get an idea if it will work,,,,Say you want to go with the 416 Rem mag .take 3 416 rem mag loaded rounds and put them in the magizine ....If they feed up into the chamber you are probably most of the way there if they don,t you need to spend money and work...........Of the half dozen or so 375 h&h that I have tried this on only one of them didn,t feed....

thanks to all for sharing your knowledge. I have heard from several sources that one pre 64 may not feed like the next. Suppose this should be my primary concern with this conversion.

I will give the 416 ammo a try before jumping off the cliff.

quote:

Originally posted by muygrande:
Can't believe I did not include that this is a pre 64 Mod 70 action and I am thinking of having the current 375 barrel bored out.

Shame on me for assuming it was a Mauser. Please disregard my replies.

Why would your rebore an original 375 barrel? The barrel, unless it has been modified, is a valuable item. I think you could sell it and fund your big bore barrel project with a new barrel and have a better arrangement. Rebores are good but not better than a new barrel unless your goal is to save the barrel furniture. On the pre=64 you can put a better big bore sight package on the new barrel. All in all I think the project would be better off all around with new barrel rather than a rebore. This is only my opinion on this and you may have other considerations. Good luck, if you want to sell the 375 barrel let me know.

ib, this barrel is already a replacement barrel. This is a hunting rifle not a collector. I am not a collector but thanks for your insight. I already have by pre 64 375 H&H done by John Ricks and it is a sweetheart! This is a second that needs to become a big brother.

Just rebarrrel your action to a .416 Rem., no other work is normally necessary. A Douglas barrel is about $115. plus cost of instalation and chambering. A lot faster turn around than any rebore and I believe new barrels are better than most rebores.

I did my .416 Rigby on a Sako .375 action and it works just fine.

I think the only times it is viable for rebore (of course barrel wall thickness allowing) is 1. barrel is octagon/has integral components. 2. stock is incredible and there is no way to get a new barrel contoured to match

new barrel best bet, sell other one to put money towards it.

Red