Ah yes, you are correct, my apologies for the misinterpretation.
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The trajectory of 6.5x55 is much lower than .303BR so the standard MkIII backsight should have more than enough vertical travel. They also have vernier graduations on the side as well as the .303 MkVII graduations on the rear face, so that would allow you to easily figure out and record you sight settings for different ranges.
The hard part might be finding one that isn't beat to hell.
The long "ladder" type target sights would work, but will be rather vulnerable to damage.
Thanks for the note! While I agree the MkIII sight would have enough vertical travel, it is not a true vernier scale on the elevation, and the windage has only 5 MOA adjustment lines compared to the finer windage adjustments of the others, hence my search for the others.
Stay safe everyone!
You are right that it is not a true vernier scale as it only has a single graduated line, unlike the windgauge which is a true vernier, but when fitted to the Mk.III rifle and firing .303 Mk.VII, each line on that side scale represented 2 MOA of elevation.
There are nine major lines with five subdivisions each, so a total of 90 minutes of angle. Each half rotation of the knurled knob raises the sights 10 MOA. (Just under 4.5 rotations)
Don't mind the nail in the photo, it's just for storage! ;)
If I am not mistaken, that is the more scarce Canada Tool (target) version with a 1/20" aperture.
Here's a link to an 85 picture photo montage of the 1905 Ross Mk II** Civilian Target Rifle in my collection ...
1905 Ross Mk II** Civilian Target Rifle Serial # 4901 (click here)
http://photos.imageevent.com/badgerd...20_Medium_.JPG(Click PIC to Enlarge)http://photos.imageevent.com/badgerd...20_Medium_.JPG(Click PIC to Enlarge)http://photos.imageevent.com/badgerd...20_Medium_.JPG
Regards,
Doug
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Above is a Lyman 48 on an M-10
You'd think the short leg 48 would have sufficed for a .280!