I agree..... I did the same thing while breaking my 10 FCP-K in 308 in. Had a box of FGMM in 168 given to me..so I figure what the heck right?....wow...was i impressed. I like,d them so much i took one apart to see whats under the hood...now Im gonna try to copy them.....
I havent tried them in 223 though but from what your saying?......I wouldnt dought there just as spot on