If you enjoy the forum please consider supporting it by signing up for a NES Membership The benefits pay for the membership many times over.
Be sure to enter the NES/MFS May Giveaway ***Canik METE SFX***
7.62Xwhat? I assume 39?
Mike
What do you consider long range?
7.62Xwhat? I assume 39?
Mike
I also have been wondering this question. Ive been looking at a Savage 10 fp with a 20'' barrel. Twist rate is 1/10'. Do you think this rifle has the ability to put them on a target @ 600yrds or will a 24'' barrel make the difference?
Military, not sure what branch, will be changing the bolt sniper gun in .308 to a 20" barrel with a change in twist rate.
So the guns handle better. Has nothing to do with accuracy.
Barrel length has no meaningful bearing on accuracy, except when you are shooting iron sights. In that case, the longer sight radius helps the shooter shoot the rifle more accurately.
Barrel length does help with long range (600+ yards) in that you can get more velocity. You don't need velocity because of trajectory. You need it because a faster bullet is better in the wind.
Barrel length does affect accuracy in one other way: a longer barrel is less rigid than a shorter one, and so flexes more under the stress of firing, reducing accuracy slightly.
Barrel rigidity decreases with the 3rd power of length and increase in rigidity with the fourth power of their outside diameter. The amount of barrel deflection between 18" and 24" mtu or heavy varmint contour is some where on the order of .0005 and .002 respectively. D=(W*l^3)/3*E*I if you would like to calculate it. Really just a cantilevered beam. Yes it is real and you can measure it, does it have a affect on accuracy? Not really. Barrel length in no way affects real world accuracy. Saying irons matter has no real bearing. The added sight radius is a side affect and does nothing to change the accuracy of the barrel .Barrel length does affect accuracy in one other way: a longer barrel is less rigid than a shorter one, and so flexes more under the stress of firing, reducing accuracy slightly.
Barrel rigidity decreases with the 3rd power of length and increase in rigidity with the fourth power of their outside diameter. The amount of barrel deflection between 18" and 24" mtu or heavy varmint contour is some where on the order of .0005 and .002 respectively. D=(W*l^3)/3*E*I if you would like to calculate it. Really just a cantilevered beam. Yes it is real and you can measure it, does it have a affect on accuracy? Not really. Barrel length in no way affects real world accuracy. Saying irons matter has no real bearing. The added sight radius is a side affect and does nothing to change the accuracy of the barrel .
Barrel length does affect accuracy in one other way: a longer barrel is less rigid than a shorter one, and so flexes more under the stress of firing, reducing accuracy slightly.
Most of the short range BR shooters have fairly short barrels for that reason, but I think most of the 1000 yard BR shooters are taking to the line with very long barrels. At a certain range, the very real increase in velocity gain makes up for any theoretical loss of accuracy. A couple hundred fps increase in velocity will make a difference in wind.
Varmint Al's webpage has some FEA (finite element analysis) of barrel harmonics. If the load has the bullet exiting from the top or bottom of it's vibration oscillation, then long barrels can be very accurate at longer ranges. However I don't think they would work at point blank bench rest. Probably not accurate enough to win.
B
That is the reason we do "ladder testing" during laod development, to find the "sweet" spot in the harmonics and try to have the bullet leave the barrel at the transition point between going up and down where there is a momentary pause.If the load has the bullet exiting from the top or bottom of it's vibration oscillation
So the guns handle better. Has nothing to do with accuracy.
Well seeing as though it's for a sniper rifle handling will of course be better and they obviously feel they can maintain the same accuracy standards with a 20 inch barrel.
Are you implying there is a accuracy component to length?