travis1971,
There are modern M98 Mauser actions being made:
Reimer Johannsen GmbH
Gottfried Prechtle
But the drawback is the price, usually in excess of $3,000/each standard length.
Granite Mountain makes variations on all sizes of the M98 including the double square bridge Magnum Mauser.
Now, here's the good news. Sarco has obtained a huge supply of new, modern Mauser M98's from Dumoulin. Cost: $295.00/each complete.
http://http://www.e-sarcoinc.com/du...&utm_campaign=Labor+Day+2014&utm_medium=email
The cost to build on a Mauser is no more expensive than building on another modern commercial action since all of the processes to 'accurize' it are the same, at least in my book. If a gunsmith quotes you a significantly higher price, find a new gunsmith. I apprenticed for 3 years with one of the masters of the Mauser actions learning everything I could including how to make custom Mauser actions from blocks of 8620 steel.
All hunter style actions flex due to the amount of material removed from the action body. That's why we employ the pillar bedding process in order to minimize the flex. If you don't want to play with that, you can use a barrel block in the stock and free-float the action so the impact of the flex is mostly eliminated.
There are very few limitations that you can place on a good condition Mausers which have been inspected carefully and thoroughly. Those that try to apply limits need to do some serious research on the British fine African rifles. Bear in mind that I'm referring to
reasonable applications in order to keep the masses from tearing me to pieces. Magnum cartridges fall into that reasonable category. Literally thousands of Mausers have been used for belted magnums as well as some of the beltless magnums.
It takes some finesse and more than casual knowledge of Mausers to make them smoother than what you get from the factory or the older production runs. But it's not impossible to create a fine, smooth action with a very light trigger if you know how. It's even easier when you can make the actions for yourself...
I would look at the Sarco/Dumoulin actions or find a used FN 'improved' action (solid side wall, etc.) post 1957 and use the best barrel you can afford, preferably a Bartlein. Triggers are easy just stay away from Hubers. Good stocks in wood or synthetic can be gotten from several sources but remember to check into how much a type or brand flexes. Be sure to have the barreled action pillar bedded.
Enjoy the process of searching and selection!
Regards.