TRSR8
Silver $$ Contributor
From what I have experianced the 457's in general are more picky than the older CZ's and the MTR chambers in particular can be even pickier. I have 2 old 452's that love anything SK or Lapua and even do decently with CCI SV. Neither one will shoot anything Eley or RWS. A lot of my buddies shoot the MTR chambered rifles and just about every one is using Lapua Midas plus at the matches with Center X a close second
My new 457 Varmint, non MTR chambered, is sporadic in nature. One day it will give me .3 groups with ammo A and .6's with ammo B then next range session flip 180. Today it was shooting bugholes with Norma TAC and turning it's nose up at Eley Match.
My advice is try a potpourri of different ammos and let the rifle tell you what it likes. Best place to find them is use the Ammoseek website. Set up a bunch of "notify me" alerts
Since I believe you’re the guy that never cleans, a factoid for you. Generally, you can shoot most ammo over ELEY but you have trouble with higher grade ELEY shooting over many other brands without clearing the other lube. At $15 a box, worth taking not of,