do the ruger single six and single seven in 327 federal mag have the same frame? also in this caliber, and the H&R, a S&W shorts and longs, do the gas check designs use 30 or 32 caliber checks? I use 30 cal check in my sks and mosin nagant, and they are the same diameter at about 312-313, and I think ( but don't know for sure), that the 32 cal gas check are for bullets like the 8mm ( 318-323 I believe)? would love some input form one of them many experts 'round here! thanks a lot, have a good'un- Travis