Week 96: Accuracy Efficiency Rating

[Mr_White]

Week 96: Accuracy Efficiency Rating

Results may be posted until February 26th, 2015.

Designed by GJM
Target: NRA B8, x 10 copies – download here: http://pistol-forum.com/attachment.p...1&d=1322428748
Distance: 25 yards
Rounds: 50

This drill is intended to explore the accuracy efficiency difference between true slow fire shooting, and shooting in a more practical manner (but without any specific time limit.) For simplicity of calculation, we are going to only score the targets for points, and ignore the x-counts.

True slow fire segment: shoot five, five shot groups at B8 targets at 25 yards (25 total rounds.) Do this in whatever way you think will allow you to get the most accuracy out of your gun and ammo. You can benchrest the gun, you can fire it offhand, you can have your more skilled shooting partner fire the shots, you can use a Ransom Rest if you have one. You can take unlimited time. You can put the gun down between shots. You can shoot one shot, go get a massage, then come back and shoot another shot before going and getting another massage. Whatever you want. The idea is to attempt to get as close to the gun and ammunition combination's inherent accuracy as you can, however you do that. Score the five, five shot groups and set aside the best one.

Practical segment: shoot five, five shot groups at B8 targets at 25 yards (25 total rounds.) There is no specific time limit. However, once you mount the gun (once you grip it and get it on target) you must fire all five shots of that group before dismounting the gun. No taking the gun off target or hands off the grip until all five shots are fired. Score all five groups and average them.

Please report:

- Gun and ammunition used

- Best single slow fire group score

- Average practical group score

- Divide the score of your average practical group by the score of your single best slow fire group to calculate the rough percentage of performance loss from shooting carefully and without regard to time, but practically and not in true slow fire.

For example, suppose you had a best slow fire group of 50 points, and an average practical group score of 44.3 points. Divide 44.3 by 50, which yields a percentage of 88.6%.

Optional: a difference in POA/POI is often reported between a cartridge manually cycled into the gun, and cartridges cycled into the gun during firing. If you wish, you may fire an administrative shot (somewhere other than the B8 target) each time you charge the gun manually in order to eliminate this variable. The rest of the drill remains the same.

[DocGKR]

G19 w/RMR06 in Unity ATOM mount carried AIWB in a JM Custom from under an untucked long sleeve flannel shirt and TNF Apex jacket firing Fed AE9FP 147 gr FMJ.

Best slow fire group = 50 pts
Average practical group score = 48.6 pts
48.6/50 = 97.2%

[Range1]

Glock 34
Fed AE9FP 147 gr FMJ.

Best slow fire group = 50 pts
Average practical group score = 46 pts
46/50 = 92%

[9mmBrad]

XDm 4.5 9mm; Rem UMC 115gr FMJ
Best slow fire group score = 43
Average practical group score = 36.8
36.8/43 = 85.6%

Yes I need to do a ton of work to get better!

[2alpha-down0]

M&P9, Freedom Munitions 115gr reman

Best slow-fire group: 45 (3/5 groups were 45, fired offhand)

Average practical group score: 38.4

AER: 85.33%

Not too bad for someone who was lucky to keep all rounds in a repair center during slow fire not 3 months ago.


Sent from my iThingy using Tapawhatsit

[Corey]

M&P9 full size, handloads with 124gr plated bullets.
Best slow fire group score: 47
Average practical group score: 43.4
AER: 92.3%

[GJM]

I saw this method of accuracy testing referenced in this article -- very interesting!

http://www.gunsamerica.com/blog/new-...ig-sauer-p320/

[GJM]

I have been too lazy to do this, largely because I don't want to go through the bullseye part of the exercise.

This afternoon, I needed to verify POA/POI on a P07 that came back from CZ Custom with their new tritium sights. I didn't bench it, but I shot this first group off hand, shooting as carefully as I could stand. Tried to channel Okie John. This was my group with Speer 124+P. I assume the gun is more accurate than this, given how I shot it.



Later I grabbed five PMC 115 ball, because I had robbed the Gold Dot out of the spare mag for my G19, and didn't want to take more rounds from it. I shot deliberately, always keeping the trigger moving for the five shots.



I don't know what to think, other than I am not much of a bullseye shooter.

[Mr_White]

Gen3 G34

Best slow fire group score: 45 points
Average practical group score: 45.8 points
45.8/45 = 101.77%, lol

Like GJM, I find slow fire shooting over the course of more than a handful of shots to be really tedious, and I think that's why these results don't make a lot of sense.

[EricM]

Gen 4 G34, Speer Lawman 115gr TMJ
Best slow fire group score: 50 points
Average practical group score: 42.4 points
42.4 / 50 = 84.8%

I'd never seriously benched a handgun before, so based on some comments I'd seen in another thread about using a laser, I decided this was as good a time as any to break in my new X400U. I was shooting at an indoor range so I brought along a folding tripod stool and a bead-filled squeeze bag. Sat on the stool, rested my elbows on the back of the stall table, put the bag near the front, and rested my hands and a bit of the pistol's backstrap/mag on the bag. Zeroing the X400 was a PITA...would've given a kidney for 1/2 MOA clicks...but once I got in the ballpark I shot this...



...then made another tweak and shot this...



Analyzing my cell phone pics afterwards, I'm measuring those at about 2.1" and 1.5". Y'all weren't kidding about Gen 4's not needing aftermarket barrels.

The practical segment did not go as well. I noticed all my groups were a few inches to the right, here's one of the tighter ones:



I went ahead and shot all 5 groups, scratched my head, then took a look at the rear sight, and sure enough the set screw was loose. Just put the sights on last week and hadn't loctited anything yet as I'm still in that kid-in-a-candy-store phase of playing with all the different sight styles and notch/post width combinations that I have access to for the first time now that I'm shooting a mainstream platform. So I know I can do better than my practical group score above. Taking a look at my targets and imagining them all shifted to the left, I'm confident my average would've been at least 45, putting my percentage in the lower 90's. While I actually did have a sight pusher with me, the range was about to close and there was no time for a reshoot.

Before I pull off the X400, I'm very curious to gather some data on what kind of groups I get standing freestyle using the laser to aim. Along with the benched laser results, and of course groups shot with sights that stay in one place, that gets as close as is feasible to isolating mechanical accuracy, steadiness of my hands/quality of trigger control, and how well I can see the sights.