DMP25-06
Well-Known Member
Can a shooter's mechanics and form , when shooting , have a direct effect on the velocity of the bullet leaving the muzzle ?
The reason that I ask is that I can not seem to produce reloaded ammo that has a low extreme spread of velocity , even though I weight-sort my brass to less than +- .5 grains , bullets sorted to .1 grain , weigh all powder charges to exactly equal weights with a balance beam scale , cut brass to equal length , anneal after 3 firings , use Redding Competition full-length neck bushing die set , and micrometer seating die , and check bullet run-out on all loaded cartridges . I use a Magnetospeed chronograph for reading velocity .
My shooting routine is as follows :
From a concrete bench , I use a Caldwell heavy front rest and a leather rabbit-ear bag for the rear rest , and position my rifle exactly the same for each shot .
Shot #1 , I pull the rifle in tight to my shoulder , concentrate on a good , smooth trigger squeeze , and make certain that I am centered on target and send it .
Provided that I am on target as I should be ,
Shots # 2, 3, 4 , I will usually relax somewhat and shoot those 3 shots which will usually be touching each other , but not touching #1 .
Shot #5 , I find myself relaxing even more , trying to send it through the same hole as the cluster of #2-3-4 , and almost always it will be not touching the others .
Velocities will show #1 as the fastest , #2 ,3, 4 will be nearly the same velocity as each other , and #5 will be slower than all others , sometimes as much as 50 FPS slower than #1 , and 20+ FPS slower than #2,3,4 shots .
Is the fact that I am unconsciously relaxing , thereby offering less resistance to the recoil , possibly causing the difference in velocity , causing wider extreme spreads ?
The laws of physics state that "For every action , there is an equal and opposite reaction".
So , if I hold the rifle tight to my shoulder , bracing against the recoil , will the bullet's velocity be faster than those shots that I relax letting the rifle free-recoil against less resistance ?
Thank You All ,
DMP25-06
The reason that I ask is that I can not seem to produce reloaded ammo that has a low extreme spread of velocity , even though I weight-sort my brass to less than +- .5 grains , bullets sorted to .1 grain , weigh all powder charges to exactly equal weights with a balance beam scale , cut brass to equal length , anneal after 3 firings , use Redding Competition full-length neck bushing die set , and micrometer seating die , and check bullet run-out on all loaded cartridges . I use a Magnetospeed chronograph for reading velocity .
My shooting routine is as follows :
From a concrete bench , I use a Caldwell heavy front rest and a leather rabbit-ear bag for the rear rest , and position my rifle exactly the same for each shot .
Shot #1 , I pull the rifle in tight to my shoulder , concentrate on a good , smooth trigger squeeze , and make certain that I am centered on target and send it .
Provided that I am on target as I should be ,
Shots # 2, 3, 4 , I will usually relax somewhat and shoot those 3 shots which will usually be touching each other , but not touching #1 .
Shot #5 , I find myself relaxing even more , trying to send it through the same hole as the cluster of #2-3-4 , and almost always it will be not touching the others .
Velocities will show #1 as the fastest , #2 ,3, 4 will be nearly the same velocity as each other , and #5 will be slower than all others , sometimes as much as 50 FPS slower than #1 , and 20+ FPS slower than #2,3,4 shots .
Is the fact that I am unconsciously relaxing , thereby offering less resistance to the recoil , possibly causing the difference in velocity , causing wider extreme spreads ?
The laws of physics state that "For every action , there is an equal and opposite reaction".
So , if I hold the rifle tight to my shoulder , bracing against the recoil , will the bullet's velocity be faster than those shots that I relax letting the rifle free-recoil against less resistance ?
Thank You All ,
DMP25-06