My brother has decided to fabricate some targets out of 1/4" inch stainless steel. Is 1/4" thick enough for hand guns or should he scrap the idea and go with 1/2"?With that said, can he double the plates and get 1/2 and still have the integrity of a solid 1/2"? We will be shooting 22lr, 45 acp, 40 s&w and 9mm. I have always shot at paper targets and never at steel. Any advice on this would be appreciated.