Rimfire Accuracy Expectations: 10 shots at 100 yards

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Blastattack

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Here's the setup: I'm running a Vudoo V22 with a 20" MTU Barrel, Vortex AMG 6-24 in a KRG Whiskey 3 stock. Off a bench, I'm supporting the rifle with a Harris bipod and my shoulder. What kind of group should I be excited about at 100 yards? I'm currently printing 1.25"-1.5" 10-shot groups at that distance with most ammo. Some hit tighter but I usually pull at least one shot. What kind of results is everyone else getting with similar support and distance?
 
I usually do 5 shot groups, and on a calm day the majority of them are sub 1". No group ever got smaller by adding another shot to it :rolleyes: A lot of ammo will spread 1"+ simply due to velocity spread, figure about 1/4" per 10fps difference and there's nothing you can do about it. Shooting over a chronograph will show you what's up with the ammo. Are you sure you "pulled" a shot, or (more likely) misjudged the wind? Amazing how a little .22 gets blown around. On a gusty day I can go 3/4" left or right of the bull at only 50 yards, just think about what would happen at 100... I'd say you're doing fairly well, getting your hands on more consistent ammo and using wind flags would be my suggestion to improve, and if you can get down to sub 1" for ten shots at 100, that's pretty well as good as .22 LR gets.
 
I'd say to get a box of Eley Tenex and use that as your base line.

If you find something that works better at any price you are blessed.

An inch at 100 is very possible... You should be able to hit pop cans at 300 yards most of the time in calm conditions if you have good ammo with a low velocity spread.

Also, single feed your ammo during such accuracy testing to prevent bullets from getting damaged during the feed from mag to chamber.
 
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You don't say what kind of ammo you have been shooting. Assuming the ammo itself is very good, that it can produce very small groups at half the distance and still perform well at 100 yards, there are a number of factors that come into play with regard to group sizes, many of which have been referred to in a previous post. Below is a little more detail to the important points made above.

Using ammo with a consistent extreme spread (ES) is increasingly important as distance to target increases. As noted above, each 10 fps difference between one round and the next produces close to 0.25" of vertical spread. Very good match ammo can have an ES of 30 to 40 fps. That means that particular ammo can have one inch of vertical spread at 100 yards simply because of ammo velocity differences alone. Only a chronograph can confirm the ES of a particular batch of ammo.

Wind also plays an increasingly important role as distance increases. The following chart illustrates the effects of even relatively light wind at 50 yards. Note that a 2 mph cross wind at 50 yards moves the bullet .2". As noted above, without wind flags or indicators it can be challenging to account for the wind, which doesn't have to be significant or very noticeable to make itself felt.



And as alluded to above, it is worth considering how much bigger ten shot groups are than five shot groups. According to a report analyzing statistical groups sizes ten shot groups are statistically very close to 30% larger than five shot groups (see h t t p ://the-long-family.com/group_size_analysis.htm ).

And in general terms of statistics and the question of ammo, it is a good rule of thumb that when the distance is doubled, group size increases about three times. To illustrate, a five shot group that is .25" center-to-center at 50 yards will more than likely be closer to .75" at 100.
 
It sounds like I’m doing fairly well for my current setup. Ammo testing with that setup includes Federal Champion, CCI standard, Federal Premium Match, SK Match, Center X, Eley Match, Eley Tenex, and I’m sure a couple others I’m likely forgetting. Everything shot is sub 1100 fps. They all performed very similarly without anything producing a serious “wow” group.

I’ll try testing off a better rest and see what happens. If I can get some nice groups under 1” I’ll be a happy camper.
 
grauhanen said:
You don't say what kind of ammo you have been shooting. Assuming the ammo itself is very good, that it can produce very small groups at half the distance and still perform well at 100 yards, there are a number of factors that come into play with regard to group sizes, many of which have been referred to in a previous post. Below is a little more detail to the important points made above.

Using ammo with a consistent extreme spread (ES) is increasingly important as distance to target increases. As noted above, each 10 fps difference between one round and the next produces close to 0.25" of vertical spread. Very good match ammo can have an ES of 30 to 40 fps. That means that particular ammo can have one inch of vertical spread at 100 yards simply because of ammo velocity differences alone. Only a chronograph can confirm the ES of a particular batch of ammo.

Wind also plays an increasingly important role as distance increases. The following chart illustrates the effects of even relatively light wind at 50 yards. Note that a 2 mph cross wind at 50 yards moves the bullet .2". As noted above, without wind flags or indicators it can be challenging to account for the wind, which doesn't have to be significant or very noticeable to make itself felt.



And as alluded to above, it is worth considering how much bigger ten shot groups are than five shot groups. According to a report analyzing statistical groups sizes ten shot groups are statistically very close to 30% larger than five shot groups (see h t t p ://the-long-family.com/group_size_analysis.htm ).

And in general terms of statistics and the question of ammo, it is a good rule of thumb that when the distance is doubled, group size increases about three times. To illustrate, a five shot group that is .25" center-to-center at 50 yards will more than likely be closer to .75" at 100.
Click to expand...

Probaly worth mentioning that a wind from the left would blow the bullets down and over by the same amount, so impacts with varying winds will form a diagonal pattern from roughly 10 to 4 o'clock... The angle depends on spin rate.
 
Over 2 examples of the Ruger Precision Rimfire 22lr and including a third aftermarket barrel, best I can do is .38mil 10 shot group at 100m, bipod and rear bag prone, Eley Club. I can duplicate that group after group.
 
I was at the range yesterday with my 40x, my M37 and a Mossberg 144LSB.
Had a bit of wind to deal with, so some groups were sporting a flyer or 2.
However, best group was a beautiful .48" at 100M, and there were several
at moa or smaller. Best ammo was a certain lot of Eley Match EPS, but other
performers were Lapua Midas L & M, RWS R50, RWS Rifle Match, Eley Tenex.
On a dead calm day with quality ammo, I expect groups under moa at 100M.
Dave.
 
I shot a 3.5" wide by 2" high group of 25 shots the other day with cci ammo. Bipod and pistol grip on support hand. Had a 12mph wind coming from about 11 oclock and gusty. Not constant.
For 5 shot groups i average 1-1.5" on any given day. Some days alot better but rarely over 2" at 100m
 
I was out shooting today and noticed my rifle was not shooting as well as usual at distance with varied velocity.

I suspect this is because I haven't shot the rifle in a couple months and surely there would be some oxidization in the bore by now. You always get oxidization when dissimilar metals remain in contact with each other in the presence of oxygen.

I suspect that cleaning the barrel will solve the problem more so than shooting off rounds until it settles in again. After sitting for so long, I should have cleaned the barrel just quickly before going out and I'll bet it would have shot better sooner.

BTW I didn't shoot at 100 yards so I don't know how it would have grouped at short range.
 
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I am surprized you're not using a lead sled. Even a cheap $35 one will take most of the human factor out of the equation.
 
Your V22 is definitely capable of better accuracy than that. Typically I'm seeing about 0.8 - 0.9 moa out to 170 yards under excellent conditions with my Vudoo set-up. I'm shooting prone with a LRA bipod and using a rear squeeze bag. Finding the correct lot of ammo and maintaining perfect consistency shot after shot is the ticket. Chasing rimfire accuracy is extremely time consuming and requires a high level of dedication!
 
Eagleye said:
I was at the range yesterday with my 40x, my M37 and a Mossberg 144LSB.
Had a bit of wind to deal with, so some groups were sporting a flyer or 2.
However, best group was a beautiful .48" at 100M, and there were several
at moa or smaller. Best ammo was a certain lot of Eley Match EPS, but other
performers were Lapua Midas L & M, RWS R50, RWS Rifle Match, Eley Tenex.
On a dead calm day with quality ammo, I expect groups under moa at 100M.
Dave.
Click to expand...

Scopes or aperture sights on your rifles? Best I've ever managed (so far) is a 7/8" center-to-center 10 rd group using CCI Std Vel in my 1967 Walther KKJ-T with aperture sights (Standard Walther KKJ-T rear sight with Gehmann variable colour-filter iris, M18 Anschutz Match 54 front sight with 0.5 eagle-eye and polarizing filter). Caldwell Junior front rest and single sandbag rear rest. Score was 100/100 8X. Photo available.
 
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