QUIGLEY SHOOTING ASSOCIATION NEWS
Many BPCR rifles (mine included) have a barrel length of around 30 inches with a sight radius of around 34 inches. This means that we can treat 1/100th of an inch on the rear sight to equate to one minute of angle (MOA).
Interim distances not listed can usually be estimated accurately enough to put a round on target, enabling further adjustment. It should be noted that when shooting at ranges other than Diggle, these settings vary slightly depending on elevation above sea level, atmospheric conditions and range construction.
Many mid-range sights are fitted with a only a 21/2 inch staff, which would really be suitable for shooting up to 800 yards but, the Pedersoli USA 405 Mid Range Soule is fitted with a 3 inch staff, although not all this can be used due to the scaled aperture block, which takes up valuable space.
However, from this data we can see that if you intend to shoot at ranges not exceeding 1000 yards, then a mid-range vernier sight with a 3 inch staff will be adequate for the job but, with a free play of only 0.5 inches or 50 MOA then you are at a maximum. It can also be noted that my Sharps is fitted with a windage adjustable front sight which is somewhat taller than the fixed version, therefore it follows that the sight settings would in fact be lower if a fixed front sight was used, giving more adjustment.
Long-range vernier sights are usually fitted with a 4in staff allowing for approximately 31/2 inches of vertical adjustment and so should be adequate for 1200 yards or perhaps even longer ranges.
Comments and questions please to;
khall6548@aol.com
Actual sight-setting for 1000 yds showing adjustment remaining.
Full extent of of Pedersoli USA med. range sight adjustment.
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