You can put every caliber on M96 that is OK for m98 Mauser. The bolt lugs dimensionally are the same for m98 and m96, and the third lug (on M98) is only -"in case....".
Norma used M96 receivers to test all of theirs cartridges and no failures have been seen....
Also a person in USA made an experiment and put almost everything up to 50 BMG on M96 Swede and they all worked without failure.
But M98 is safer in case of extreme pressure - like cartridge over loaded with powder...etc...
I have a friend shooting 300 Win Mag on M96 for long time reloading for hottest possible load all the time - no pro....but he drilled another holes on the bolt to help a gas escape - "just in case"....
borislav
Woah! that's serious stuff! Not my habit to beat on someone here, but hey, I can't control myself!
First of all, M/98 have been chambered for magnums by factories, NOT so for the M/94/96/38!
Then, all the pre-98 were not designed to handle pressures above about 48 000 PSI - Husqvarna and Carl Gustav are the only factories who ever built sporting rifles based on the M/94/96/38 - others, like Vapen-Depoten have used ex-military actions, but always with looooonnnngggg throats to lower pressures!
But HVA, who built the biggest amount of these "sporters" never stepped above a MAP of 57 700 PSI!
The M/94/96/38 really lacks the third lug of the M/98, plus the material surrounding the front ring AND the gas escaping capability a M/98 has!
And I am don't even talking about metallurgy involved in these actions!
And I can certify you that even if you drill those thiny holes in the receiver ring and chamber one of those rifles to a Magnum caliber, material fatigue will come to meet you so fast you just couldn't believe it!
And if you want to refer to Norma regarding the M/94/96/38, you better have your facts straight; they blew hundreds of M/94/96/38 in their testings, and this with factory chamberings (including 6.5X55!)...
I can't even understand HOW you can make a .50 BMG to even be chambered by a M/94/98/38, and even by a M/98, as the BOLT HEAD IS SMALLER THAN THE CASE HEAD!
Please, quit talking things you don't know about!
Now, of the M/94/96/38 the OP is referring to, many are NOT REWORKED. All the sporting guns built by HVA (Husqvarna) are real sporting rifles, made of BRAND NEW, in the white actions. These are fine actions, as long as you treat them right.
All of the factory rifles (except those made the Kimber, whish in the past, a lot have developped ste back over abuse) of European origin are tested under the CIP norm (even if Sweden is not part of CIP, they follow the same rules), which means a static pressure test of 1.15 the MAP (Maximum Average Pressure) and a proof test load of 1.25 time the MAP.
As a built-in security "device", the Mauser actions were designed and built with very soft (core and a thiny anti-wear surface hardening), low carbon steel, and they typically start creating excessive headspace (set-back) before letting go.
Then, in case of a case head failure, pray for the top of the front ring to stay were it's supposed to be and if not, for the receiver to bend to hold the bolt away from the shooter's face.
As per said before, it will withstand normal service and some abuse without flinching. But, pleae do not cross the line - at least if you intend shooting beside me.
I do hunt and shoot those rifles (a.k.a. M/46/ 46A and 640 - most of my rifles are factory chambered for 9.3X62) and they work great.
Sorry, I had to state it.