Hat Tip:
http://pistol-forum.com/showthread.p...e-such-a-thing
http://pistol-forum.com/showthread.p...mp-P-grip-size
Background: I'm small handed, small wristed novice; hand span is 8", wrist circumference is 6.5".
I practice with a Walther P99, which offers interchangeable backstraps. However, I purchased the pistol used, and it came with only one insert - the small. 2,500 rounds later, I thought to acquire the spare sizes to discern any potential performance difference. But how is this measured?
With the small, medium, or large insert installed, I can still reach the (ambidextrous) magazine release, and my thumb can still reach the slide stop/release (although with the large insert I can only reach the rearmost third of the stop/release). I can manipulate the trigger to the rear with no sight disruption with any of the three options. "Pointability" tends to be a wash with inconsistent results... and my body will usually catch on after the second or third presentation with the same insert.
I went to the range today to test any rapid fire differences between the back straps. I varied the order and arrangement within each test.
(Bill Drill = S x 2, M x 2, L x 3, M x 1, S x 1; 3X5 = M x 1, L x 1, S x 1, repeat; 2" = M x 1, S x 1, L x 1)
Bill Drill (low, extended ready)
Target 1
Times reflect only split times, reaction time is not included.
4 on a 3X5 @ 7Y (low, extended ready)
Target 2
Times reflect only split times, reaction time is not included.
4 on a 2" @ 5Y (low, extended ready)
Target 3
Times reflect only split times, reaction time is not included.
Accuracy - 2" @ 7Y
Target 4
Interpretation?
I've calculated averages, medians, ersatz hit factors of one point per hit...
GoogleDoc
Performance appeared to favor large, then medium, then small - and subjectively I agree. Recoil, flip, and sight tracking seemed easier. However I wanted to inquire in to the minds of pistol-forum of other considerations I should... consider.
1. How far can I interpret the hits on the targets? (vertical/horizontal stringing, spread)
The large and medium appear to have tighter groups, more center line, except for the accuracy target. I didn't know if someone could read in to it further?
2. I should likely test one hand only shooting, yes?
The medium grip may be better for one hand shooting over the large grip or vice versa?
3. 25 yard accuracy testing?
I ran out of time at the range, but do you think B-8's at 25 yards test grip shape/size as much as trigger pull/stance/hold?
4. Should I consider the draw stroke?
Do you think the grip size plays a significant role with indexing the hand on the weapon, press outs or punch outs? Or do you think you train to that?
5. Have I missed the elephant in the room?
Any help or insight is appreciated!