The poi of the pellets was a little to the left of poa after mounting the scope and I didn't bother to re-zero. The following table shows the shot strings and poa's of the numbered groups of Bisley Practice pellets. The poa's started at the bull and then I used the numbers printed in the scoring rings, the pen annotations show the sequence of groups.
Shots 1-150 normal round of 15 practice targets.
Shots group poa
151-160 1 bull
161-170 2 8
171-180 3 6
181-190 4 4
191-200 5 2
201-210 6 7
211-220 7 5
221-230 8 3
231-240 9 8
241-250 10 6
251-260 11 4
260-275 12 4
There's quite clearly a trend in the shots dropping from group 9 onwards. When I got to group 12 I continued beyond 10 shots and put another 5 on the target. At this stage the cylinder was almost empty, the sound of the shots had changed and the pellets were tearing through the target. Since I didn't want to shoot onto the first group I stopped at that point.
I would now be confident using this pistol for at least another round of 50 shots beyond the 150 that I normally stop at.
Given more time I would be interested in repeating the exercise using 10m air rifle target strips to get a linear pattern of groups rather than working round a pistol target. I'd also be interested in chronographing the shots and logging the cylinder pressure, albeit a little crude.
I found it an interesting excercise overall.
