Velocity affect accuracy ?

[Absoroka]

A possible variant might be related to breaking the sound barrier. A round ball is not the most ballistically effective design and encounters significant bow wave issues when breaking the barrier. Shooting velocities that break the sound barrier could happen at different points along the trajectory, depending on the velocity of the load. It could possibly affect POI. That being said, most of us probably can't out shoot the result. My .50 caliber flintlock shoots very accurately with loads ranging from 65 to 110 grains of 2FF. Seventy five grains of 2FF produces the tightest groups most consistently. The search for the "sweet spot" is half the fun.

 

[andy52]

Not bad at all ! If you would put a dot on a blank sheet of paper and adjust your scope left or right off target then shoot a group aiming at the dot you might be surprised at the results. Shooting a small target exactly where you are aiming will destroys your aiming point. That will cause your group to open up a bit! I have won a few dollars with this trick! Most people don't think about this?

Those shots were fired for the group only, the aiming point was the small diamond in the center of the target

A possible variant might be related to breaking the sound barrier. A round ball is not the most ballistically effective design and encounters significant bow wave issues when breaking the barrier. Shooting velocities that break the sound barrier could happen at different points along the trajectory, depending on the velocity of the load. It could possibly affect POI. That being said, most of us probably can't out shoot the result. My .50 caliber flintlock shoots very accurately with loads ranging from 65 to 110 grains of 2FF. Seventy five grains of 2FF produces the tightest groups most consistently. The search for the "sweet spot" is half the fun.

Very true and it happens twice if you're shooting long range once at the muzzle and again when the projectile drops below sonic.

 

[Erwan]

kelljp[/USER]]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.

Did you hear something about a Gaussian curve?

 

[longcruise]

Did you hear something about a Gaussian curve?

View attachment 369711

Shucks, I've never heard of a gaussiajn curve. What's it tell us and what data goes into it?

 

[LME]

Did you hear something about a Gaussian curv

Shucks, I've never heard of a gaussiajn curve. What's it tell us and what data goes into it?

I bet you have heard of the bell curve? Same thing but your professor prefers the ,"Gaussian curve"!

 

[longcruise]

I bet you have heard of the bell curve? Same thing but your professor prefers the ,"Gaussian curve"!

Aha! Of course. I stll wonder what ml data would be input and what would it tell us?

 

[Erwan]

Aha! Of course. I stll wonder what ml data would be input and what would it tell us?

In this case, you can compare the velocity/accuracy relationship using a Gauss curve. To begin with, and before choosing the most suitable load according to caliber and base load, and therefore projectile velocity, you need to follow this curve. At first, velocity is not good and dispersion is high. You increase the load and therefore the velocity and your dispersion cone starts to decrease, it will decrease more and more to reach the highest point of the curve and if you continue to increase the velocity the accuracy will start to drop and the higher the velocity the more you'll be on the wrong side of the curve: your dispersion cone will deteriorate more and more to return to the lowest point, as if you hadn't worked on your load and had stayed at the basic minimum load, which is most often 1 caliber for a grain, eg. 45 grains for a .45 caliber, which happens to be the most common starting load before fine-tuning the load and, consequently, the velocity/precision ratio before establishing the load that corresponds to your weapon.

I don't know if I've made myself clear, as I often find it difficult to explain certain basic technical principles in your language.

Erwan.