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|Oval Egg Sinkers to Slug Your Barrel!|
J. Marshall Stanton on 2012-07-07
In slugging firearm barrels to determine internal barrel dimensions, common ordinary oval egg sinkers do a wonderful job. They are ideally suited to the task, they are pure lead, so they are butter-soft and go down a bore easily, secondly, their egg shape facilitates starting them down the bore, and also, there’s a limited amount of bearing surface of the sinker that is actually full groove diameter. Lastly, the fact that they have the longitudinal hole running the length of the sinker gives compressed lead a place to migrate to when it goes through a constriction, and thereby gives a much more accurate and true dimension of the internal measurements of the barrel since a solid lead ball would have a residual “spring-back” memory, which can actually give up to .0015” oversize readings when measured, simply because it is a solid ball, unlike the oval egg sinker with the hole running though it.