I'm trying to find out if it is possible to rechamber a 7MM Rem Mag to a 7 STW without having to set the barrel back. What is the magazine length standards on each normally? (not the loaded round OAL). Thanks or your help.
That is a very common way of going to that caliber, as long as you do it slowly and watch the head spacing. Just remember though that it was found out by many the std. 24 inch barrel isn't long enough 26 + is more desirable to get the extra energy and velocity of the chambering.
As far as the mag. length goes you can buy the 7stw mag tin from rem.
I always enjoyed that caliber.
Usually not a problem but there can be situations where the shoulder on the old 7mm Rem Mag chamber will not be completely cleaned up by the STW reamer.
For example, if you have a 7mm Rem Mag chamber that is dimensionally on the outer limits of SAAMI spec and a 7mm STW reamer that is a min spec custom reamer, you may see this problem.
I have only seen it once, it does not happen often but it does happen. If you used a standard spec 7mm STW reamer, I would doubt you would have any problem unless you had a very loose 7mm Rem Mag chamber to start with.
Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.
Been thinkin about picking up a new sfII sendero in 7mm RM and having it reamed to 7 STW. Think it would make a nice long range rig and give my 270 win LSS some company. Either that or just go with the SFII in 300WM and calling it good with 165gr Sierra Gameking HPBT. Wonder what it would cost to have it rechambered to the STW.