You might want to be more specific. A long action from any of the belted magnums would work for a 7mm barrel- 7mm rem mag? 7mm wby mag ? 7mm stw ? super 7 ?...............
I had a Browning ss in 7mm mag rechambered to 7mm STW ..26 inch barrel and ok for weight,shoots darn good..You might want to think about going that way..:RIMROCK