ORIGINAL: stubblejumper
It doesn't matter what the tables say,all that matters is that you shoot the gun with your hunting load,and see for yourself where the bullet actually impacts at a given distance.
Don't shoot at game at any distance farther that what you have shot targets at,since you really won't know where the bullets will strike.
What stubblejumper says here is absolutely correct! ALWAYS confirm your rifle's zero at the longest range you will ever take a shot at, because a rifle zeroedin at 100 yards or less often shoots very differently father out, especially in the windage setting. But you also need to know your REAL trajectory out there. Tables are usually NOT what your rifle will actually do.
The 2" difference in barrel length will not have any significant effect on the trajectory of your rifle. Using identical bullets, a 200 FPS difference in MV is only worth three or four inches even at 500 yards!