No.4 T shooting at 400 yards.

[Surpmil]

Interesting, I had a guy swearing blind his Mk1 had MOA clicks, I rather dismissed him, maybe Surpmil is responsible for my needing to pen an apology!

Peter fitted some up to scopes he overhauled around that time if people wanted them. Could be one of them.

This is the last pair, the gent who made them was a very skilled self-taught machinist, but he passed on years ago sadly.

Did a bit of experimentation at the time on how to rectify the problem of detent plunger holes worn ovoid and the backlash that develops as a result. Peter illustrates his solution in his book: detent plungers made to the No32 Mk3 pattern, but larger to fit the Mk.I/II scope plunger holes.

[Roger Payne]

Marvelous workmanship. The late Graham Smith made me ten sets of Mk3 scope R&D assemblies, complete with index plates, R&D scales, bronze springs, lead screws, central threaded spindle & the knurled drum 'knobs' themselves. I still have about four or five of sets left & every time I look at his work it is a humbling experience........

[Surpmil]

There's never a surplus of humility about so I can second that benefit Roger, but I feel it's as much inspirational. If one has the desire or determination, given opportunity the rest will follow, unless one is just born with "ten thumbs". Look at what is made in places like the N.W. Frontier with the crudest of tools. Yes, some of it is junk, but some of it is remarkably good.

Not to take anything away from those who have really mastered machine tools, because that is a study of years, but IMHO it is not in the same league as what our forefathers achieved with only basic hand tools. I happened to show someone a book the other week called "Decorative Antique Ironwork" by Henry René D'Allemagne. The work illustrated in that book done by the great iron workers of Europe's past is "mind-blowing" in the current terminology. All done with not much more than hammers, punches, chisels and hand-made files!

[Roger Payne]

I agree entirely, & enclose four photo's that just give a hint of Graham's capabilities........the upper Mk3 scope (without bracket) was a complete rebuild using his parts.

[Surpmil]

Brilliant work. Yes, routine to some people, but not us. And I believe we have someone here among us who is fully in this league.

In the meantime, here is a piece of work to be admired, and used.

[bigduke6]

Brilliant work. Yes, routine to some people, but not us. And I believe we have someone here among us who is fully in this league.

In the meantime, here is a piece of work to be admired, and used.

Very Nice, for anyone looking for any information on any machine Tools , Lathes.co.uk is an excellent site, Tony managed to source a manual for my Henry Milnes Milling Machine.

[Alan de Enfield]

Just reading thru an old manual and found a tip for judging distances and 400 yards was mentioned (as per the title of this thread)

Its a long way and iron-sights don't make it any shorter.

[GeeRam]

I found this mark-up online of a standard 303 zero target, with added check dims, and was wondering if there's a mathematical formula for calculating the ranges from the zero point or existing 300 and 600 yards points so as to be able to mark up one for a zero check at 900 yards?

Attachment 110145

[Bindi2]

I found this mark-up online of a standard 303 zero target, with added check dims, and was wondering if there's a mathematical formula for calculating the ranges from the zero point or existing 300 and 600 yards points so as to be able to mark up one for a zero check at 900 yards?

Attachment 110145

Yes there is someone who shoots at Bisley will be able to help you get one. Maybe a little different having a full circle black not half.

[Strangely Brown]

I found this mark-up online of a standard 303 zero target, with added check dims, and was wondering if there's a mathematical formula for calculating the ranges from the zero point or existing 300 and 600 yards points so as to be able to mark up one for a zero check at 900 yards?
Attachment 110145

Once you have found an elevation that works out to 900x for your rifle and ammunition at Bisley (34 1/2 MoA?) is to then go to the zero range after you have shot at 900x and zero on a 303 SR"b" zero target with your 900x yard elevation.
You could also use a 7.62mm zero card and put a white target patch over half the round bull to make it into a tin hat aiming point.
Once established you have the correct rise in inches for future zeroing sessions.

Also ask in the range office if they still have the old style SR"b" zero cards, these went up to 1000x yards but I suspect they might have all gone now.

Regarding shooting on the NRA TR round bull; the trick here is to use the normal elevation that you would on a tin hat target, (or whatever your elevation calculator says) and simply add half of the target aiming point in MoA to what your elevation should be and aim at the base of the black aiming point.
Doing this at 900x you just add 2 1/2 MoA to your normal elevation of 34 1/2 = 37 MoA.
Ironically I was shooting with the ATSC on Wednesday at 900x with my No.4 SR"b" and did just that.