I load some 75gr Speer gold dots in 223 and I think that would be almost as good as any 300 bo round or 6.5 grendal.but none of those are what I'd call a brush gun other than having a 16in barrel and slightly easier to carry through super thick brush which you can't shoot through anyways.ive thought about getting a 45-70 or 450 Bushmaster but I just new I'd grab my normal 24in barreled rifles knowing I might go hunt cutover or powerline.