AFTER sighting-in for hunting from two different brush blinds, groups show the Hunting Master shoots to various points-of impact from different rested shooting positions. As much as 1-1/2" difference at 30 yards. The red dots are the aiming-points.
I absolutely love shooting tiny groups from a sand-bagged bench-rest with my Duk iL Arms AR6 Hunting Master PCP revolver, however I've noticed she shoots to different points-of-impact from the hunting rests of my ground blinds; no doubt due to firing from positions/angles slightly different than that of the sand-bagged shooting bench on my back porch. Before adding the steel muzzle brake/weight for competition work, that difference seemed to be about 1" at 25-35 yards. I'd hoped the muzzle weight might reduce or minimize the POI differences from solid bench-rest to hunting rested positions, but NOOO! Matter of fact it seems to have increased the difference in points-of-impact. Careful testing snd (re)sighting-in yesterday for the transition back to hunting (from competition) has given me some quantification of the differences (with the muzzle weight installed).
The photo below shows groups fired after dialing almost 20 clicks down in elevation and about half as many clicks windage to attain the zero I was seeking from my two brush blinds (one at a feeder, and another at a water-trough). And though there is still a little POI difference between the two blinds, that difference is only about 3/4". However the POI difference between my solid back-porch bench-rest and the relatively-shaky tripod rest at my feeder is a full 1-1/2"; hence the need to re-zero the scope before hunting with this rig. Which brings us to a few pertinent points and conclusions drawn from this quantification.
1) A couple things might be contributors to such wide differences in POI with the powerful Hunting Master PCP revolver that might not be as extreme with other pistols, but in my experiences nevertheless exist with all pistols- A) The relatively heavy external hammer and hammer-blow on this relatively light and very powerful air pistol shifts the gun more before the pellets exits the barrel than does a lighter, inline hammer-strike on a heavier and/or less powerful air pistol. B) The powerful muzzle-blast of the AR6 also contributes to the POI/rest-position situation.
2) Though this experience confirms the POI change relating to differences in rests, gun and shooter angles pretty graphically and quantifiably, in my many decades of pistol-shooting experience the same situation exists with any pistol of any kind; though more obviously with scoped pistols. Few shooters can shoot tight enough pistol groups at long enough distances with iron sights to notice this, much less quantify it.
3) In my opinion this helps explain many, MANY misses and/or less-than-perfect hunting shots. Not just for other hunters, but Your's Truly as well!
4) That it took so many clicks elevation and windage to re-zero at 25-35 yards reflects the fact that each 1/4 MOA click adjusts the point of impact less than 1/10" at 30 yards. This explains why many shooters adjust too few clicks when sighting-in to move the POI as far as they think it will, especially at relatively short ranges.
).