Actually, if you are going to use a Volquartsen barrel, you have to get a set of shims (Artifex sells them) for your 10/22 Magnum.
Lilja and Clark make drop-in barrels for the 10/22 Magnum, but Green Mountain and Volquartsen don't make them yet.
Not a straight drop-in, but it is quite simple with the shims.
If you get a Volquartsen 77/17HMR barrel, you'll be disappointed if you try to shoot it by just dropping it in your 10/22 Magnum.
So, either get a Lilja or Clark 10/22 Magnum 10/17HMR drop-in barrel or get the GM or Volquartsen 77/17HMR barrel and the shim kit.
Good luck!
