oldrookie

I shoot both bullets from my Ultra Mag, an Omega and 2 Remingtons, I do shoot 110 grains of T7 though and @ 100 yards i would be surprised if you saw dramatic difference. Maybe a couple of inches. The bigger problem might be left and right. The lighter bullet may set up different harmonic in the barrel causing the bullet to drift & then again nothing may change much you will not know untill you shoot it.

Look at this target shot with an Ultra-Mag... especially the lower left target shot after the gun was sighted in. The top 2 target were sight in targets....