Still more about testing .22 long rifle ammunition: how to quickly eliminate variables.

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A recent email asked about an old article, wherein I talked about the problems with residual lube in a .22 rimfire barrel. Is it really a problem, the email asked, and if so how do I go about eliminating that variable in testing?

Yes, the effects are real. I never believed in the residual lube theory until I saw the results for myself, and to this day I can repeat them at will with that rifle and ammo.

My test protocol now is to use a standard smallbore target, the type with 6 bullseyes on a sheet. The upper left corner is used to fire 25 seasoning rounds, without regard for group size. This both burns off any residual lubricant and allows me to make any sight adjustments to bring the rounds fairly close to center. I then fire a 5-round group at each remaining bullseye, which gives a good average of the groups that ammunition will deliver. If you’re counting, that’s one single box of ammunition on one sheet of paper.

Rimfire purists will point out that this is not a sufficient number of rounds to really ascertain the true performance of any specific load, and I’ll admit that subsequent testing will sometimes show small differences in group size (better or worse) than this. If you’re a serious rimfire match shooter, you’ll need to fire hundreds of rounds to truly judge what the ammunition will do. Of course, if you are that person you also won’t be looking here for advice!

I’ve found my test procedure to be the easiest, fastest, most reliable method to obtain a decent (field-grade) indicator of relative performance of rimfire ammunition.

-=[ Grant ]=-

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About the Author:

Grant Cunningham is a renowned author and teacher in the fields of self defense, defensive shooting education and personal safety. He’s written several popular books on handguns and defensive shooting, including "The Book of the Revolver", "Shooter’s Guide To Handguns", "Defensive Revolver Fundamentals", "Defensive Pistol Fundamentals", and "Practice Strategies for Defensive Shooting" (Fall 2015.) Grant has also written articles on shooting, self defense, training and teaching for many magazines and shooting websites, including Concealed Carry Magazine, Gun Digest Magazine, the Association of Defensive Shooting Instructors ADSI) and the popular Personal Defense Network training website. He’s produced a DVD in the National Rifle Association’s Personal Firearm Defense series titled "Defensive Revolver Fundamentals" and teaches defensive shooting and personal safety courses all over the United States.
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