by John Boy » Thu Mar 23, 2006 11:03 pm
Moonshine, whether your are shooting benchrest or with sticks, the best spot to place the barrel is on ... The Sweet Spot.
A barrel has harmonic vibrations when the bullet is moving down the bore to the muzzle. The vibration waves move from the muzzle to the breech and at the same time from the breech to the muzzle. Where they meet is the Sweet Spot.
Think of the waves this way:
Muzzle>>>>>>>>>> |Sweet Spot|<<<<<<<<<<<Breech
(The Sweet Spot is where there is no harmonic vibration of the barrel, known as the Null Point)
How does one find this Spot? Pour some baby powder on top of the barrel and fire a round- OFF HAND with your hand NOT ON THE BARREL. It's best done with your hand as close to the receiver as you can get it. The powder will move and create the >>>>>|<<<<<<< pattern on the barrel. Mark the spot with a crayon or piece of tape. Repeat the process again 4 or 5 times-OFF HAND, same way.
Now put a piece of tape at the point of the Sweet Spot.
Next shoot some 5 shot groups (bench rest or sticks at 50 yards) with the barrel resting at the Null Point. Move the barrel forward or backwards (a tad at a time) to verify the exact point of the best group accuracy. Mark it.
That's where you rest your barrel on your sticks.
Regards
John
SJPSSS - Founder & Only Chapter Member