yeah with brush busting your best bet is deffinately a slug, A friend and I tested several calibers the same way as bigcountry did, even tested two of the quote best brush busting calibers 44 mag and 375 winchester both with poor results, had the best results with wolf 200 grain SP 7.62x54R out of a mosin nagant and winchester 64 grain power points in .223 rem out of a mini-14. and the best results with 12 ga. 1 oz rifled slugs.