I do own one of the Hosford gauges and measure BWT on most every gun I purchase ,as stated if you in fact move your guiding arm up or down it changes measurements decidedly but if you take your time and watch as you guide it down the bore over and over you can come up with very similar results with each measurements ! To be quite honest , it is an enjoyable task but mostly what I use my gauge for is pitting , it is very easy to look down the bore and see a pit but you have no way of knowing how large or especially how deep it extends into the wall of the barrel ! These gauges are great for this type of measuring ,the head will drop directly into the pit and without any doubt you know instantly how deep it is ! The gauges are expensive but so are Higher Graded Parker Guns and much more so if the Barrels are bad and you are stuck with it !!!!!!!!!!!!!!! When I buy any gun ,especially on line I always request at least a three day inspection and return period and this time is used to measure the BWT , it is most helpful with the Damascus Barreled guns which seem to have the most pitting ,probably because of the age of the gun and the powders burn't in them early on ! I feel the Gauge is money well spent , but it is Just my Two Cents worth of opinion !
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