A while back I bought a Mannlicher-Schoenauer Model 1952 carbine in .270 Winchester. The caliber neither fitted local hunting conditions nor spared my hearing, which is already impaired, so I decided to have it rebored and rechambered to 9.3X62. The conversion was carried out without incident, but concern about the effect of heavier recoil on the stock has led me to limit my loadings to relatively light loads with light weight bullets.

I would be grateful for suggestions as to how the somewhat fragile appearing M/S stock can be reinforced to withstand the additional recoil of full loads.

Yes, as you observe, the MS stocks are thin and fragile around that fat mag. Not much you can do about it; you can reinforce the recoil lug area with expoxy/glass, but that is not where it is going to break. You could expoxy carbon fiber strips on the outside to reinforce it. Might not look too good but it wouldn't break. I think you have a situation here and also you have already implemented the solution. OTOH, they were made in 9.3x62 from the factory....

Do you have a picture of it that we can see?

I agree with the other poster, figure out how to laminate some carbon fiber in, but do it on the inside of the stock - which will require some more material to be removed, but probably not more than 1/16" for the carbon fiber and epoxy.

http://www.ebay.com/itm/Carbon...rksid=p2054897.l4276

Section about reinforcing the wrist.
http://books.google.com/books?...ifle%20stock&f=false

My friend has Mannlicher Schönauer in factory caliber 9,3x62. He and the pre-him owners had shot with that rifle many kind of ( I think mostly factory made) ammos without any stock damage. As you maybe have soon noticed the fitting of the stock is very tight so if screws are tight I suppose no problem to shoot 9,3x62 ammos.

In the early days of the Remington 1100 the forends would often crack. Later versions were reinforced with a layer of fiberglass cloth.That doesn't take up much room.

It ain't the wrist that is weak, and I have a Rem 1100 with the glass reinforced foreend; it is cracked.
It will probably be fine as is, maybe. And if it breaks, then you can make another one.