I do not consider three shot groups any measure of accuracy or consistency. I still shoot ten shot groups, and if truth be told, I should be shooting 40 shot groups. There is an excellent article at the end of the Oct 2014 Shooting Sports USA on group size and accuracy:
http://www.nxtbook.com/nxtbooks/nra/ssusa_201410/ This foundational article was written by small bore prone competitors who wanted to shoot perfect scores. In small bore prone a Match is a 40 shot event of two twenty shot targets. The typical 1600 round Smallbore bore prone tournament is 160 rounds fired for record, divided up into four 40 round Matches. Therefore the referenced article assumes that a 40 round group is the baseline.
As anyone can see in table six, at least at 100 yards, a five shot group is 59% of the size of a 40 shot group, a 10 shot 74%, and a twenty shot 88%. A three shot group is below contempt, but three shot groups are the current standard for the shooting community because the leaders of the shooting community, that is in print Gunwriters, have convinced the shooting community that three shot groups are an exact measure of accuracy and consistency.
This is another good article on the limitations of five shot groups
Accuracy Testing: Shortcomings Of The Five-Shot Group
by Brad Miller, Ph.D. - Wednesday, September 25, 2019
https://www.ssusa.org/articles/2019/9/25/accuracy-testing-shortcomings-of-the-five-shot-group
one that addresses statistics for accuracy.
Shot Group Statistics for Small Arms Applications
https://apps.dtic.mil/sti/pdfs/AD1034885.pdf
The inprint crowd gets paid a flat fee for an article, Dpris said $400, and it only makes economic sense to spend as little time at the range, and shoot as little as possible, and even at that, the in print writers can't be making much money. Luckily for them people love symmetry, and equilateral triangles are symmetrical, and you can tell humans find triangle shapes pleasing as they are all over ancient and modern designs and architecture. Would you prefer your eternal megalomaniac monument to be a pyramid, or an irregular polygon? I find somewhere around five sides, the
irregular polygon is a bit jarring, but highly representative of actual groups.
Based on my experience, the older wood stocked factory rifles shot poorly unless glass bedded.
this Remington Classic is typical
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flyers and the action slide around in the stock, causing this lateral dispersion.
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Remington put a wood pressure point at the tip of the stock, the barrel touched the barrel channel, in several places. Once I bedded the action and free floated the barrel, it shot well. This is a zeroing group.
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It really liked SMK bullets, and this is the best of the ten shot groups I shot that day,
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It has been my experience that factory rifles require tinkering to make the buggers shoot consistently. And then I purchased a M70 in a tupperware stock.
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Did nothing but stick a cheap scope on top, and it shoots well. Makes me wonder, if tupperware stocks are the way to go, since wood has to be worked for best results.
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this is not bad with cheap FMJBT bullets
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If you pay more, you will get more
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BSA made a good rifle:
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this BSA was discontinued in the middle 1950's, for the MKIII version. Still shoots well
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When rifles get this old, it takes time to find the right parts, if they can be found, and till I found a BSA handstop, this one worked.
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