This is my first post here so bear with me.
I have a 42 Shirley that became a '53 FTR No4 Mk 1/2. The rifle has the +.075 front blade in it and a MK1 rear ladder sight. I took the rifle to the range for the first time and was able to shoot a 1 inch group with 3 shots at 50 yards. Since this was the first time I had shot the rifle I didn't bring any tools or replacement blades. It wasn't my intention to zero the rifle on the first time out. I didn't shoot on the 25 yard range because it doubles as a long pistol range and is standing supported only. I also didn't shoot on the 100 yard range after my shots on the 50 yard range.
So my 3 shot group was 4.5 inches low (and a little left) at 50 yards.
I have the full set of replacement blades, but i'd like an idea of a good starting point. I think it did the math right onhttps://www.milsurps.com/enfield.php?pg=ti12.htm calculating front sight height for zero, but I may have got it wrong. I came up with 28.5 x 4.5 = 128.25 / 1800 = .07125 My front blade is .075 - .07125 = .00375 so my closest blade is the 0.00 blade. So am I right that this would be a good start at acheiving a 200 yard zero on a 50 yard target? I have read that this is for surplus 174 grain ammo. Wihat difference will it make that I am using 150 grain soft point boat tail ammo?
Second question- I read on a different website that with the MK1 rear sight that each click will move your shot up or down 1/2" at 100 yards. I can line up the marks on my rear sight so it's set for 200 yards... but it's not bottomed out. I don't know if all sights were like this or if I have something special or maybe mine is out of spec. Mine will drop an additional 3 clicks below the 200 yard line on the sight. So does this mean that if I zero the rifle at 200 yards (with the sight exactly on the 200 yard mark) my shots at 100 yards should be an a couple inches high right? So then if I bottom out my sight those extra 3 clicks at 100 yards then I should pretty much have POA = POI... Is that correct?
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