Here's a link to a ballistic calculator.
The b.c. fpr that bullet is .193
Velocity 2390
3" high at 50 yards = sighted in at 210 yards
The gun will be almost 5" high at 100 yards

http://www.handloads.com/calc/

Your buddy needs to try some Hornady Leverevolution ammo. The name brush buster is a misconception, it doesn't exist. All cartridges will be deflected by brush. The Hornady ammo has a pointed bullet but the tip is a type of rubber that won't detonate the cartridge in front of it. The remington bullet that you tried is a 150 grain round nose bullet at 2390 fps. The Hornady round is a 160 grain pointed boattail bullet at 2400 fps. It shoots with a flatter trajectory and retains more energy at longer distances. I talked to the Hornady rep at the shot show and this bullet will expand reliably at 300 yards. The rubber tip enhances expansion when it "Squishes" flat it "squishes" outward.