Air Gun Hold Over with a Weaver Kaspa Scope

So I have several different scopes that I have been using for air gun competitions. I have two Kaspa 3-12X scopes, 30mm bodies that reticles which help deal with hold over.  So lets compare what the difference between the velocity available to a TM1000 (about 800 fps) and and HM1000X (about 940 fps, so lets use 920 fps) for the kill zone as well as the point of impact for this scope.

Shooting a 40 yard zero with the 25 caliber TM1000 at 795 fps with the 25 grain JSB Diabolo Kings, the following ranges match up with the reticules.  The software, Hawke ChairGun Pro (v4.1.3) is really a nice tool for working out shooting angles, kill zones, etc.

Weaver Reticle View at 90 yards

The Weaver scope has (at 12X power) cross hatches at at 2, 4, 7, 12, and 15 MOA (15 MOA not shown).

First lets compare the kill zones (since the flatter shooting pellet can be zeroed out more).  The kill zone I established is +- 1/2 inch on the point of impact (POI).  So you can shoot at most targets dead on in the kill zone range.

800 fps  11.4 to 45.2 yards with a 40 yard zero
920 fps:  13.0 to 50.8 yards with a 45 yard zero

Now lets compare where those reticles cross using the above power levels
                          POI (yards at moa)
MOA            800 fps            920 fps
0                     40                    45
2                     55                    56
4                     64                    66
7                     74                    79
12                   84                    96


So obviously we get a bit flatter shooting, a better kill zone, and of course more kinetic energy.  About 48 fpe at 920 fps, and about 36 fpe at 795 fps.  In the coming weeks I will test the accuracy and find out if that extra power comes at a cost, or if we can shoot the HM1000X at full power.

Graph of the point of impact for a 25 cal JSB Diabolo Pellet (795 fps)

Graph of the point of impact for a 25 cal JSB Diabolo Pellet (920 fps)