Shotgun Slugs and 22LR Ballistics

Do ballistics programs work with 22LR and Shotgun slugs at Mach 1 (about 1110fps)?

From 0 - 100 yards you are about Mach 1.2 - 0.9 with a 12ga slug. This is a sensitive region (see graph) and most computer programs have very few data points in that range, so they won't work well.
McCoy's book:

Most programs store this graph as a rough approximation. So the steep wiggly part isn't represented well.
Over Mach 1.4 is pretty much a straight line, so the programs are accurate there.


Here is the "GNU Exterior Ballistics Computer" source for G7:
case G7:
if (vp> 4200 ) { A = 1.29081656775919e-09; M = 3.24121295355962; }
else if (vp> 3000 ) { A = 0.0171422231434847 ; M = 1.27907168025204; }
else if (vp> 1470 ) { A = 2.33355948302505e-03; M = 1.52693913274526; }
else if (vp> 1260 ) { A = 7.97592111627665e-04; M = 1.67688974440324; }
else if (vp> 1110 ) { A = 5.71086414289273e-12; M = 4.3212826264889 ; }
else if (vp> 960 ) { A = 3.02865108244904e-17; M = 5.99074203776707; }
else if (vp> 670 ) { A = 7.52285155782535e-06; M = 2.1738019851075 ; }
else if (vp> 540 ) { A = 1.31766281225189e-05; M = 2.08774690257991; }
else if (vp> 0 ) { A = 1.34504843776525e-05; M = 2.08702306738884; }
break;

You have 3 points in the jiggly range around 1110fps, which isn't what you would like. 3 points between 1260 and 4200 is OKish with the straight line.

22LR has the same problem, not enough data for the curve at those velocities.

Why ballistics is important

From the Internets:
"It still mystifies me that Jack O'Connor and Elmer Keith killed anything. ...(blah blah)...
Sighting your 30-06, 270, 7 Remington or 300 Winchester 2.5" high at 100 yards will let you hold on hair way out to 400 yards which, frankly, if further than most shooters have any business shooting at game." 

 Here we have some actual data. You are off by 20 or 30 inches at 400 yards, depending on the load of course. Unless you are being attacked by a herd of dinosaurs, this is nowhere good enough way out to 400 yards.
If you spend $500 on your rifle, spend 5 minutes finding out what the drop is at the ranges you will be shooting at, and stick the numbers on your rifle sling.