Every time I read one of these threads I kind of laugh at the EVERY gun is different comment and you have to try 20 kinds of ammo to find the right one. While true it is not to near the extent that internet legend has created.
Some ammo is clearly loaded to tighter tolerance than others. Norma, Nosler, Weatherby, RWS, Sellier and Bellot and Lapua factory ammo are all loaded to much tighter tolerances than Winchester White Box or Remington PMC.
I have NEVER seen a 22 Hornet that would not shoot 12.6 grains of Lil'Gun, 40 grain Vmax, WW or Privi case and Fed SP primers into less than an inch and I have tried that load in over 2 dozen Hornets.
If you have a 7mm that won't shoot 162 grain Horn and 63 grains of 4831 into less than 1 inches or a 308 that won't shoot Black Hills Competition ammo there is something wrong with the gun.
If you are looking for the most ultimately accurate ammo in your gun you might have to try a lot of different ammo to be sure. If you want a good hunting load start with well made ammo and the bullet you want to use. If you stick to the more premium ammo it is VERY likely you will get 1" or better out of most loads. Can you find Federal Blue box that shoots as good, maybe.
So in my case, I have never seen a 7x57 or 7x57R that will not shoot Sellier and Bellot or Norma factory 150 and 174 grain bullets into better than 1", most shoot close to 1/2". I have often had trouble creating hand loads that will out shoot it.
I have never had a Weatherby that would not shoot Weatherby ammo under an inch, my latest 257 Bee will shoot Weatherby Select into .25 3 shot groups.
In your case I would suggest you get a box of Nosler in the bullet you like and a box of Barnes Vortex in 140 or 150 grain TSX or TTSX. Ten to one both will shoot under and inch for 3 shots.
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