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Hello,

Yes, I skipped the "I've Almost Done It II" & III because the pun was just too good :D

In my ongoing quest to get sub-MOA 100yd groups from bulk ammo, I sort by weight and modify using D Rock's tool. I've recently switched to American Eagle 38gn HP. The bullet weight and powder charge are very consistent, but the cases are not - they seem to vary largely on the amount of priming compound, and some are therefore louder than others.

I come sooo close to sub-MOA 5 shot groups many times, and have broken it numerous occasions if I throw out a flier or two, but there always seems to be one or two that prevent the sub-MOA five shot group.

Here are two of the best groups I managed tonight, out of a total of three groups:





As you can see, three are sub-MOA (with one three shot group being almost 1/2 MOA at 100yds!). However, I have vertical stringing.

I need to see if I can get some help with that.

My front rest was the rifle's bipod, and the rear rest was a squeeze sock.

I shot prone, sniper style (vs the one leg bent position I'd been taught).

I know I had a little vertical movement, but this much?

The wind was dead calm. I didn't have to adjust windage at all.

Do you suppose I'm at the mechanical limits of the gun, my own limits, the limits of the ammo due to the inconsistency of the primer charges and the whole sonic barrier thing, or all or none of the above?

My 'scope is a Mueller 4.5-14x APV. The rifle is a Savage MkII BTVS that I pillar bedded. The barrel is definitely free floating.

Torque on the action screws are 55in-lb front (this one has been modified to take a main bolt) and the rear, being stock, takes about 25in-lb or so.

Is there something I should be doing that I am not? Or am I just pressing the limits too much?

What do you all think?

Thanks,

Josh
 

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I'd get rid of the bi-pod and go to a rest near the receiver, preferably a big bag.

Have you verfied that the gun is capable of sub MOA? I feel that it is, given the groups you are shooting and my personal testing with various ammo in my own .22LR guns.

Bulk ammo is typically not as accurate as the various CCI boxed stuff, no matter what you are shooting. My best accuracy, across the board was with CCI Velocitor ammo, which is sub MOA in my Ruger 77/22 K7722VHZ, thats the 24" heavy barreled gun. This is so called Hyper Velocity, but is safe in all chambers.

The biggest problem with Bulk pack ammo is that it is so inconsistent lot to lot, and as you've noticed, even shot to shot. While it is safe, the shot charges and primer mix variations cause just enough of a velocity variation to cause accuracy problems. Sticking to subsonic or supersonic ammo that will stay supersonic out to the range you want to shoot should eliminate most of the accuracy issues.
 

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. . . What do you all think?

Thanks,

Josh
IMO, this is excellent shooting considering the type of ammunition you're using.

If you serious about printing some tight groups, suggest you try some match grade rimfire ammunition and save the bulk for informal practice. Unfortunately, we are not really into rimfire shooting like the Europeans so a lot of the match grade stuff is made overseas but a brick of it shouldn't break the bank. Take a look at what's available over at www.champchoice.com and give it a try. What they have to offer doesn't come cheap but it's very consistent and may give you the results that you're looking for.
 

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Is there something I should be doing that I am not? Or am I just pressing the limits too much?

What do you all think?

Thanks,

Josh

The thing with a .22LR and "bulk" ammo is the odds. The "odds" are that you might eventually (if you shoot enough of it) shoot a 5-shot MOA or better group at 100yds. The "odds" also say you will never be able to do it consistently, which means that if you do get an MOA group without fliers, it was a fluke- not the norm. If you just want to say "I did it" then, by all means, shoot away! If, however, you're looking to do it regularly, or even semi-regularly, you're going to need to use higher quality, non-bulk packed, ammo.

Having said that... The most consistently accurate "bulk" ammo that I've tried is Federal's AutoMatch AM22. In my guns this stuff shoots with, but is not necessarily more accurate than; SK Std+, Eley Target (yellow box), Lapua Center-X and, on a good day, RWS Rifle Match. It's definitely the best "bang-for-the-buck" I've found. The fact that it's a supersonic round and still shoots this well was a bit of an eye opener.

Good luck!
 

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The first 10/22 that I built up, back in the early '90's, really liked the American Eagle stuff. My last three 10/22's that I've built up and modified all prefer the Velocitor ammo. When shooting at 50 yards my best "fluke" was 5 shots into .0137" Got several 1/4" groups. But, at 100 yards if I can keep 'em inside of an inch I'm thrilled. My 10/22 Magnum will do 1/2" to 3/4" on a regular basis, often enough that I'm pleased. And all I was trying to do was build an accurate squirrel rifle.

So yeah, I'd think you were doing real fine. I'd lose the bipod though.
 

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Since you are trying to did this with bulk ammo try the CCI Blazer. It is now offered in bulk packs and is the exact same stuff you can buy in the cardboard 50 round boxes. It shoots real well in my rifle, almost as good as Eley and it's pretty dang cheap. Also, as already stated, sort it by rim thickness and if you want to go one step further weigh sort it after that. I bet if you do all this you will satisfy your quest. Then, you will have to find a new quest.:D
 

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In my experience FLIERS are something we are forced to live with in regards to .22 LR Ammo, yes even with Target Ammo at times.

I know it is not the same gun but with my Custom Ruger 77/22 (Clark Custom Guns Barrel with Volquartsen Laminated Stock) I have found that action screw torque does indeed make a difference. On my Ruger I have found that 25 to 30 inch pounds is the sweet spot. You may need to try some different torque settings, 30 inch pounds difference front to to rear screw seems like a lot to me.

At any rate I have shot a few SUB MOA 5 shot groups at 100 yards from my Custom Ruger using Remington BULK Hollow Points (unmodified), but it is not the norm. However 1.5 MOA is quite easily done. However when I switch to SK Jagd Standard Plus 1" down to 3/4" groups are quite possible.

Lots of things go into producing good groups with a .22 LR Rimfire.

Larry
 
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