Free: Contests & Raffles.
Believing that a certain ammunition which shoots well or poorly in one rifle will shoot the same in a different firearm is a fool's errand. Two identical rifles of the same make, model and caliber will often shoot differently with the same ammunition. Very slight variations in barrels can result in different harmonics as a bullet travels down the barrel.Conclusion: only your rifle can tell you which ammunition it prefers or dislikes.
Are those at 50 or 100?
Another thing that will help your groups is to shoot at a target that has nice crisp aiming points, like the corner of a square, or an 'X'. Aiming at the edge of a circle will give you some built in error automatically.