Packrat1947 wrote:
As an aside, I shot at a local range for about 30 years. One day I decided to do some measurements with a 100 ft. tape. The 100 yd. range was really 104 yds. The 200 range was about 190 yds. We made up some brass markers to locate the proper distances. The range was built in the 40s and someone just stepped it off and said this is good enough.
Just did all the calculations and accidentally flushed my post. So this rehash is rushed.
Summary: Of course tennis courts are flat ENOUGH, rectangular ENOUGH, and ROUGHLY the right size. All as per defined in their rule book. Line can't be infinitely tight, so the net it tall ENOUGH, and straight ENOUGH. Line painters aren't precision instruments. And when it rains it's obvious the court isn't perfectly flat and both sides aren't identical.
For 300 yd shooting, the difference on target between someone shooting a 10-ring (7 in. on an SR-3 target) on the line at 890 feet (10 feet in front of line) [1] and making the EXACT SAME shot at 910 ft (10 feet behind the line) [2] is 0.1573033707564 in. further from dead center.
A 5.56 is 0.218897 in. or 0.1094485 half dia.
A 7.62 is 0.2999991 in. 0.14999955 half dia.
So, one shooter might gain a point. If that shooter has a 20ft advantage on the other and both shoot the exact same shot.
So, plopping down anywhere on a 6 foot berm, where the maximum difference is half that? The exact same shot would score the exact same.
Unless everyone is shooting ragged single holes, or desperately depending on every shot that barely cuts the edges of higher scoring rings.
In your example, any error or advantage is only relevant if trying to compare scores shot at different ranges. Everyone that competed on 100 yd targets at a distance of 104 yds competed under the same conditions and was equally matched. And unless you've been training at different ranges, would have no effect on you trying to get as good as you can get through training.
When you competed elsewhere you might wonder why your groups are a percentage larger or smaller than normal, or why the target was that percentage smaller larger when aiming. As would people coming to your range. But again, in each case everyone would be competing under the same conditions.
So yes, it was all "good enough".
[1]
http://keisan.casio.com/exec/system/1273850202 height = 10680 and base = 7 gives a vertex angle of 0.037553412194 degrees
[2]
http://keisan.casio.com/exec/system/1273850202 Vertex angle of 0.037553412194 and height = 10920 gives a base of 7.1573033707564