Velocity Question pertaining to 45-70

[1Shirt]

Agree wit Btroj. I have for years used 22 gr. of 2400 with one grain of fluffed Dacron over powder in my #1 45-70. Killed a lot of paper with that load, and one real good sized boar in Tex. with that load. Think It chronos about 1250 or thereabouts. Have nothing against Unique or 4064, and am sure both will do the job. Being cheap, would not use 4064 just because of vol required to launch at the same vol as Unique. Would use Unique because of the obvious more bang for the buck. I shot a lot of Unique in mine, but 2400 had an edge over it, so have stayed with 2400. If I were to need more umph, would go up with 2400 to probably around the 26 gr. level or more, as the 22 gr. I am shooting is nowhere near the top load for my rifle.
1Shirt!

[gon2shoot]

OK, I'll add my 2 cents. I think you're question was same velocity with different powders. You've been given several answers about burn rate, pressure curve etc..

The "target" will never know what powder you used, It's up to you to find the load that gets you on target.
(and I use a lot of 2400 too)

[Jeffery8mm]

Still playing with all this knowledge!! I shot some comparison targets today with the 4064 and the Unique. The Unique consistantly groups HIGHER on the paper than the 4064. I assume this is because the loads with unique are not leaving the barrel as fast, hence a longer time in the barrel with the barrel rising due to recoil,thus the higher point of impact??
Thanks
Jeff

[1Shirt]

Yep Jeff, in all probability you got the answer!
1Shirt!

[nanuk]

as per the OP's ?

speed is speed. NO difference once it leaves the barrel.

how it gets there is a whole new ball game, but, you didn't ask about that.

[NHlever]

as per the OP's ?

speed is speed. NO difference once it leaves the barrel.

how it gets there is a whole new ball game, but, you didn't ask about that.

That is the bottom line answer to the OP's question. We use different powders to get better accuracy, lower sound levels, slower push to our boolits for soft alloys, and a bunch of other reasons, but once it leaves the barrel at a given speed it matters not how it go there.s Trajectory, and killing power are all determined by speed, boolit shape, and boolit weight. To change, or increase killing power at 1300 fps., you can increase the size of the meplat (flat on the nose of the boolit), or increase the weight of the boolit, or both.