Greetings Ginga,
You may wish to check your barrel twist rate before loading. Hornady specifies a minimum 1 in 8.5" twist for that projectile while the standard 7mm Rem SAUM twist is around 1 in 9.5" or 1 in 9.25". A friend had trouble with his Rem Mag stabilizing heavier projectiles, can't remember which, shot well at 100 but turned to crap much past that. It was later re barreled with a 1 in 8" twist.
Regards Grandpamac.
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