Has anybody out there ever ported their own barrels? My SBH has a nasty recoil 'flip' when shooting big loads [so what else is new?] and i've been considering checking into barrel porting [or am i just being a whoosie?] . Is this something that's terribly complicated [i.e. needs to be 'tuned'] or is it just as simple as putting a few holes on the top of barrel's muzzle and something i could do myself w/ a drillpress? I've done a web search and can't find much info about it [except pertaining to paintball guns... a lot of help that is]. Any info on this subject would be appreciated.