As has been stated, shooting mil-surp ammo isn't going to be *dangerous* in your rifle.  However, chances are good that you'll have cycling problems sooner or later, as the tight match chamber in this rifle isn't designed for the higher-pressure military ammo.  You may see high pressure signs (flattened or cratered primers, brass flow on the case head, etc.), have failures to extract and/or eject, and possibly even problems having the bolt close on its won.

You *did* buy a match rifle that was intended to be fed match ammo.  My usual analogy is that if you bought a racecar and put 87 octane in it, you shouldn't be surprised that it doesn't run very well, if at all, considering that it was designed for 106+ octane gas.

Ya gotta pay to play.

Having said that, you're spending WAY too much money on ammo.  Either mailorder a case (or half-case) of decent ammo or go to Walmart and pick up some 40-round boxes of the 45gr Varmint ammo.

-Troy

The OLD mil-spec Winchester white-box (Q3131) would have been a problem, but Winchester no longer makes it.  Olin/Winchester used to run the military's Lake City plant, but they lost the contract to Alliant/Federal in 2000.  The old Q3131 used to be made there.

The current white-box stuff, both the FMJ and the 45gr JHP varmint stuff is SAAMI-spec, and should work fine in your rifle.  You can get either from Walmart fairly cheap.  You can still save money by ordering online by the case, though.

-Troy