[time-nuts] He is a Time-Nut Troublemaker....
bruce.griffiths at xtra.co.nz
Mon Dec 22 19:36:57 UTC 2008
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.
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.
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