Whoa, watch the scurrying, "What the heck is he TALKING ABOUT, IS HE CRAZY?!?! Well, yes, ask my wife, she'll tell you flat out I'm nuttier than a Minnesota fruitcake. The question actually is thusly spake; I have some very interesting 80 grain bullets in the .224 diameter that do not fit the norm, not by a long shot. Now, 99% of 80 gr load data are generated with the venerated Sierra Match King as it incredibly popular...but have to be loaded very long, 2.550, because the MK is 1.066 inches long all by itself. This F Class load, (or so I'm told), has to be single loaded in the AR style rifle because it cannot fit the 2.260 length magazine. Understandable, I am in TUNE with the cosmos on this one... Now we get to MY 80 grain bullets, gifted to me by a very fine gentleman to try out and something nagged at my reptilian back brain...so I checked it out. The 77gr HPBT Sierra Match King is .994 inch long, (bullet lengths from JBM Ballistics web page), and the Hodgdon online reloading data I have shows loads with it down to 2.260 COAL...like the guy said on Laugh In..."Very interesting...!" Why? Well, I'd say because these really neat looking 80 grain Spitzer base soft point bullets I have measure out at .92 to .925 inches. By now the experienced long time loaders are groaning and saying "Just DO it!" Probably. Because my obvious question here is, how many loaders here would shriek HERESY for using 77 grain data for an 80 grain bullet, down 10% to start, of course, loaded to that mythically perfect 2.260? Why, oh why, oh why must I torment thee, and just load it out to 2.550 like the data says...because my BREN 805 lacks a bolt release and single loading the suckers is a pain - I tried with a dummy round. Hopefully I made it amusing enough for someone with more .223/5.56mm loading experience than I to chime in. Thank you for any positive and helpful replies.