Having fun reading the bbl length and annealing posts and thought I would toss this out to chew on...
Its pretty common for a gun of any caliber to shoot more accurately at lower than max speed, however, why?
This got me thinking several years back when I bought a Browning in 300WM with a BOSS system. What I found was instead of needing to try several powders, ( which I did ), I could make the gun shoot much better groups simply by changing the harmonics with the moveable weight.
So, if someone has a powder that won't shoot good groups its more likely related to bbl length because that particular powders burn rate creates poor harmonics with the bbl that gun is wearing. Changing powder will change the harmonics even if you are trying to duplicate the velocity of the inaccurate powder because of burn rate changes.
Ex - say powder X produces 2500 fps and out of a 20 in bbl it has fair to poor accuracy results - add 1 or 2 inches to that same bbl and it may/could/should change the grouping size dramatically when applying the BOSS system thought process...
So, saying "well a 20 in bbl for this caliber is good enough because the powder burn efficiency ended at say 18 in approx.", sounds good, but in theory 21 or 22 in bbl with the same load may produce much better accuracy. Does any of this matter much under most hunting conditions - probably not - may for a long range hunter though..?
Its pretty common for a gun of any caliber to shoot more accurately at lower than max speed, however, why?
This got me thinking several years back when I bought a Browning in 300WM with a BOSS system. What I found was instead of needing to try several powders, ( which I did ), I could make the gun shoot much better groups simply by changing the harmonics with the moveable weight.
So, if someone has a powder that won't shoot good groups its more likely related to bbl length because that particular powders burn rate creates poor harmonics with the bbl that gun is wearing. Changing powder will change the harmonics even if you are trying to duplicate the velocity of the inaccurate powder because of burn rate changes.
Ex - say powder X produces 2500 fps and out of a 20 in bbl it has fair to poor accuracy results - add 1 or 2 inches to that same bbl and it may/could/should change the grouping size dramatically when applying the BOSS system thought process...
So, saying "well a 20 in bbl for this caliber is good enough because the powder burn efficiency ended at say 18 in approx.", sounds good, but in theory 21 or 22 in bbl with the same load may produce much better accuracy. Does any of this matter much under most hunting conditions - probably not - may for a long range hunter though..?
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