Velocity affect accuracy ?

[kelljp]

Was reading an article about accuracy in a modern rifle and the ammo manufacturer was stating there ammo for accuracy had a slower velocity to improve accuracy. That being said I wondered had anyone tested this concept in black powder rifles. I would assume it would follow suit. Even though I have always tried to achieve the max velocity. Maybe that is why I am a ousy shot.

 

[tenngun]

Was reading an article about accuracy in a modern rifle and the ammo manufacturer was stating there ammo for accuracy had a slower velocity to improve accuracy. That being said I wondered had anyone tested this concept in black powder rifles. I would assume it would follow suit. Even though I have always tried to achieve the max velocity. Maybe that is why I am a ousy shot.

I note after a point faster seems to open up the group. My best shooting ever was a Green River .54x42x1
Loaded with .527 and .02 patch on seventy grains 3f GOex
Tack driver at fifty yards and under two inch’s at a hundred,
At 100 grains I was closer to four inches, and 140 added another inch
I have found my best shooting ever in the 1400-1500 fps
Now a caveat is my smoothies
If I’m shooting patched ball lower velocities are fine, but faster works better shooting bare ball.
In my TFC .62 I get great groups with PRB at 65 grains, but 110 on bare matches my patched.
However, being old and wimpy I generally shoot bare over 75 grains and it shoots with deer hunting accuracy

 

[morehops52]

In my own experience as well as much reading on the subject a maximum charge rarely gives the best accuracy.

 

[stubshaft]

Optimum accuracy is usually dependent on finding the velocity where the barrel harmonics allow the bullet to exit the muzzle at exactly the same point.

 

[andy52]

Optimum accuracy is usually dependent on finding the velocity where the barrel harmonics allow the bullet to exit the muzzle at exactly the same point.

Correct. The idea is to get the bullet to exit the barrel in the middle of the harmonic cycle. It takes time to work up a load, but you only have to do it once.