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I'm kicking around a project idea for this long weekend. Without getting into specifics at this point, what do you consider to be the minimum or sufficient number of shots in a group for accuracy testing? 3 or 5 shots?
The subject will be a .22LR...
Nothing so needs reforming as other people's habits.
-Mark Twain
Proverbs 3:5; Philippians 4:13
Got to have a Jones for this
Jones for that
This running with the Joneses boy
Just ain't where it's at
5 shots, with 22LR, but unless you are using match grade ammo weigh your rounds until you have 5 that are equal. That will take the fliers out of the equation.
If you really want to go crazy,buy 3 different brands of Match grade ammo/use a lead sled/and while leaving enough time to avoid excessive barrel heat up do 10 rds?
More Samples/Qty while removing most of the possible operator errors will provide the closest true result.
Almost all of my shooting, both silhouette and smallbore prone, requires strings of 10 shots at either 100 meters or 100 yards, therefore I test .22 ammo for accuracy using 10 shot strings at 100 meters. Separates the sheep from the goats, 8 shots in an inch is no big thing, 10 shot is something else again. Almost always a flyer out of the group a ways. The cheap ammo will throw the flyer(s) further.
Here's what I'm thinking about. I picked up some scrap cabinet type wood for my favorite price: free. I want to make a block to hold .22LR which is no big deal. I own a ruler, pencils, a drill press and drill bits and I'm not afraid to use them.
I want to set something up to hold 5-10 "control rounds" when trying Acu'rized ammo but wasn't sure if I should set up the block to hold multiples of 3 or 5 for the re-formed rounds.
The test subjects will be a CZ452, BL22, Win75 and maybe the Buckmark carbine.
Nothing so needs reforming as other people's habits.
-Mark Twain
Proverbs 3:5; Philippians 4:13
Got to have a Jones for this
Jones for that
This running with the Joneses boy
Just ain't where it's at
We have a local club at which they conduct benchrest .22 LR matches. These guys spend hundreds just in testing all the various .22 LR products. Most all have about $2000 in their rifle and scope. They shoot some teeny tiny groups BUT because they have to shoot at 25 then 50 then 100 yards there is some skill involved as well just in keeping track of their come-ups and such. Some of these guys (remembering that the ammo comes in 50-round boxes and some costs upwards of $18+ a box now) shoot multiple 5-round groups in testing. I think that 5-rounds is about the max duration of their ability to concentrate, they can then take a break and have another go.
Sincerely,
Hobie
"We are all travelers in the wilderness of this world, and the best that we find in our travels is an honest friend." Robert Louis Stevenson
For LOAD accuracy testing 3 shots is fine for I can tell everything I need to know about the LOAD by then. Accuracy testing a rifle is a different matter. The 10/22 I just built will shoot bug holes for the first 5 shots but will open up and drift a little as the barrel warms after that. More shots definitely tell different stories. But for the record I usually do 5 shot strings with a rimfire due to minimal ammo cost and do 3 shot strings when working up loads for my centerfires.
I'm a 5 shot for group size (when I'm actually that interested), but most important to me is where the 1st shot goes, then where any subsequent shots go.
Griff,
SASS/CMSA #93
NRA Patron
GUSA #93
There is a fine line between hobby & obsession! AND... I'm over it!!
No I ain't ready, but let's do it anyway!
I think 10 is better for some reasons. I think with 10 you'll pretty much get the same results you would get with 5, except it will give you a better chance to see if there are occasional fliers. I think you could have 2 different combinations to test, and they would give similar average group sizes except that one might be more prone to fliers than the other.
I think the 10 shot deal has stuck with me (when shooting .22,s ) because back in the 70's when we had a High School Rifle Club(Junior NRA sponsored program)that was what our groups were measured on and its just stuck with me.
Yes my friends, thats back when we could take our guns to school with us!