Spent some quality time at the range today. Here is some ammo testing from a bench and a shooting bag.

Model M&P15-22 - A1 Style Comp
Barrel Length: 16"
Barrel Twist: 1 in 15"

85-90 Degrees - Light Breeze
Targets @ 50 yards
Chronograph @ 10ft
Chrono Data based upon 10 shots

Ran a boresnake through the barrel between each string

All data below:
0 - Failure to Feed
0 - Failure to Fire
0 - Failure to Eject

* In most cases the first round fed by closing the bolt
was the flyer in the group. 10/10 data is shown for all
shots, and 9/10 data is shown for the best 9 out of 10 shots.

========================================
CCI MINIMAG HP HIVEL
Average 1,237
Standard Dev 22
Extreme Spread 64

Accuracy:
10/10 = 1.90
9/10 = 1.33
-----------------------------
CCI STINGER
Average 1,604
Standard Dev 16
Extreme Spread 52

Accuracy:
10/10 = 3.74
9/10 = 1.99
-----------------------------
CCI VELOCITOR
Average 1,368
Standard Dev 20
Extreme Spread 69

Accuracy:
10/10 = 2.80
9/10 = 1.14
-----------------------------
FEDERAL AUTOMATCH
Average 1,106
Standar Dev 33
Extreme Spread 116

Accuracy:
10/10 = 3.19
9/10 = 2.11
-----------------------------
FEDERAL VALUE PACK
Average 1,181
Standard Dev 27
Extreme Spread 105

Accuracy:
10/10 = 2.35
9/10 = 1.66
-----------------------------
REMINGTON 22 SUBSONIC
Average 970
Standard Dev 59
Extreme Spread 178

Accuracy:
10/10 = 2.01
9/10 = 1.99
-----------------------------
REMINGTON GOLDEN BULLET
Average 1,248
Standar Dev 18
Extreme Spread 56

Accuracy:
10/10 = 3.19
9/10 = 2.38
-----------------------------
REMINGTON SHURSHOT TARGET
Average 1,063
Standard Dev 17
Extreme Spread 60

Accuracy:
10/10 = 3.17
9/10 = 2.99
-----------------------------
REMINGTON YELLOW JACKET
Average 1,340
Standar Dev 26
Extreme Spread 77

Accuracy:
10/10 = 4.05
9/10 = 3.44
-----------------------------
WINCHESTER SUPERX SUPERSPEED HP
Average 1,343
Standard Dev 31
Extreme Spread 114

Accuracy:
10/10 = 2.96
9/10 = 2.44
-----------------------------
WINCHESTER SUPREME XPEDITER
Average 1,463
Standard Dev 95
Extreme Spread 267

Accuracy:
10/10 = 3.09
9/10 = 2.30
-----------------------------

nice man, thanks for the testing and posting this.

Great info, I was just wondering that the accuracy was measured in. Because I only use Fed automatch and bulk, and once in ever blue moon i use cci

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Shoot em' all!

Great data, thanks for taking the time to do this

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ΜΟΛΩΝ ΛΑΒΕ
Paracordwraps

Nice work. Thanks for taking the time and expense.
Good grief-some of these groups I used to do with my ol' Remington .45ACP. Hard to believe that 4" groups are the best that some ammo can do with this rifle. I have a distinct feeling that .22 ammo ain't what it used to be.
I do thank all of you for your comments and help. My plan is to search for the food it likes, verified by shooting from a bench with a well anchored rest. I will tinker with the barrel and stock cap a little, and see what helps. (I still feel that the crux of my problem is the stock flex.) I feel confident that I'll eventually work into consistent 1 to 1.5" 25 yard groups. If by chance I can't, well hell, off to the gun show she goes for the best price offered- and maybe I switch over to tricking up a 10-22. Jeeze I'm 68 tomorrow, and I still love doing this stuff!

may i ask which federal bulk you used? i usually stick to automatch and the 550pk copper washed stuff. (load 750)

Thanks for documenting this!

Great info.

Has anybody determined if there is much difference between the CCI MiniMag HP vs the non HP roundnose?

Around here it's easier to get the HP version.

no info on Blazer?

The Federal Automatch is listed above.

The bulk was the Maroon Federal Value Pack from Wally World.

Not yet... that was one of the brands missing in my testing.

I hope no one minds me bumping this thread. This is great info.

Since this was done 2 years ago it would be interesting to see the results using the mass produced ammo that is being sold now. That is if you can find it.

Bill

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GO HOGS

I'll gladly supply some Federal Automatch. That looks like a good, economical choice for a suppressed gun.

Some better ideas for accuracy would be to do what ammo testers usually do. Also some things to avoid specifically with the 15-22.

1.Take the quad rail cap off to free float the barrel.
2. Do NOT put any pressure on the quad rail as this will stress the barrel position relative to the sights.
3. Rest the barrel on the rest as close to the receiver as you can. Do not use a bipod on the quad rail.
4. Do not put your off hand anywhere near the quad rail. It should be under the stock supporting it.
5. Try to keep any of your weight from weighing on the rifle. Take a good but not hard grip on the lower receiver grip.
6. The rifle should sit very lightly on the rest. If you have to put any pressure on the rifle to make the sights line up for the shot it will warp the barrel to sight relationship.

Ammo- Doing a boresnake and nothing else between ammo is a problem. After any kind of barrel cleaning a .22 will not exhibit its best accuracy until enough rounds have gone thru the barrel for the ammo lube to season the barrel. Minimum 5, max is 1 rd per inch of barrel. If you are not doing this then the test is totally meaningless. I knew right awy there was an issue when Velocitors had the tightest group and it is going way above the sound barrier and coming down. The sub-sonics should have kicked every other rounds *** in group size.