Chuck It was a paper written around 1942 detailing the procedures used to align the sights of mass produced rifles for which it was impractical to have each rifle individually adjusted on a firing range. Unfortunately I dont think I have a copy of this any longer, however I'll keep an eye out for it. The alignment jig used a mirror attached to a cylindrical plug that was a close slip fit into the end of the bore. It wasn't perfect but far better than not adjusting the sights at all.
Bruce Chuck Harris wrote: > Could you be more specific, and perhaps provide a reference? > > Paul Mauser's group was pretty fussy about sighting through the > new barrels, and bending them a little here and there to make sure > their bores were perfectly straight. The WWII records on the M1 Garand > talk of using a bore scope to adjust the adjustible iron sights. > The WWII records on the M1 Carbine talk of the same technique. > > -Chuck Harris > > Bruce Griffiths wrote: > >> Mark Sims wrote: >> >>> I got to play with a custom .50 BMG that shoots meaningful groups at 1500 >>> meters... the maker's definition of >>> "meaningful group" is "smaller than your head". I managed to put two >>> rounds through pretty much the same hole. >>> Don't know where most of the other 18 rounds went... Then there was his >>> .17 cal varmint rifle. Does wonders for >>> groundhoggies at 500 yards. Most gawd awful recoil through. I was black >>> and blue for a month. The barrel and all >>> the hardware in those guns is finished to optical tolerances and maintains >>> it despite having just a little less >>> energy than a small nuke going off each time you fire. >>> >>> >>> >> The fact that the direction in which the last 4" of the barrel largely >> determines the initial trajectory of the >> bullet (in absence of crosswind etc) was made use of to assist in alignment >> of the sights during mass production of >> infantry rifles during WWII. >> >> Bruce >> >> > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.