Scratching my head at the range with different powders

[powermax]

experimenting with different powders, can anyone explain this,..
powder "A" shoots 100 FPS faster but impact is 4" lower than power "B" going 100 FPS slower,. how can that be?

 

[RidgeTop]

maybe something to do with burn rate of powders.

 

[powermax]

maybe something to do with burn rate of powders.

very likely but then point of impact isn't fully determined by VO?

 

[med358-boise]

Are you using a free recoil technique?

 

[ShtrRdy]

It's due to the barrel harmonics and the direction the muzzle is pointed when the bullet exits the barrel.

 

[FEENIX]

very likely but then point of impact isn't fully determined by VO?

Also, point of aim affects point of impact.

 

[powermax]

Are you using a free recoil technique?

shooting off bag rest

 

[powermax]

It's due to the barrel harmonics and the direction the muzzle is pointed when the bullet exits the barrel.

ah interesting point, i had the targets on different back boards 15' apart left to right..

 

[powermax]

Also, point of aim affects point of impact.

good point, (pun intended)

 

[Ricky C]

Hey, not sure if this is exactly correct, but here's how I see it. The faster bullet gets out of the barrel quicker so there is less muzzle rise, the bullet hits lower. I know that there are other factors in there too, but that seem to be pretty consistent for me
Take Care

 

[Rosebud]

It's due to the barrel harmonics and the direction the muzzle is pointed when the bullet exits the barrel.

This

 

[Rosebud]

Barrels vibrant like a tuning fork when fired, that's where accuracy node come in. Hit the right vibration spot consistently, good group.

 

[Petey308]

Different barrel timing and harmonics created by different pressure curve. You can see all kinds of shifts in point of impact when you change anything that changes pressure and harmonics.

 

[Doc88]

Post in thread 'Tuning for long range' https://www.longrangehunting.com/threads/tuning-for-long-range.192998/post-1886692

First few sentences explain why higher velocities will sometimes have a lower impact.