WHAT DOES SIERRA GAMECHANGER 6.5 CREEDMOOR MEAN?

Superb ammo. My cz 457 enjoys these things. Ideal 50yd groups outside of 15 match ammo tested, chrono’d at 1070 ave, minimal sd. Oily lube, seems to take a few far more down the pipe to year the barrel, rather than waxy lube like Eley.My 1st team with this particular ammo would've fit over a dime at forty meters via my CZ 457. Essentially a a sin