Faster or slower powder to flatten trajectory

[Gunfreak25]

I like this thread, I shoot 43 Mauser and 577 450 Martini, typical heavy trajectory that is essentially lobbing them downrange. I recently started shooting 6.5 Swede and have fallen in love with flat as hell trajectory (I hardly have to touch the sights for different ranges) and mild recoil. It is the best of both worlds. Velocity will be the main contributor to trajectory once it leaves the bore. Of course, not all twist rates and bullet weights/styles support higher velocities while maintaining optimal accuracy. There are some neat calculators online for ballistic co efficiency.

[BAGTIC]

Neither faster or slower powders flatten trajectory. Reduced time of flight flattens trajectory.

[Larry Gibson]

Neither faster or slower powders flatten trajectory. Reduced time of flight flattens trajectory.

And, pray tell, how do we reduce the time of flight?

Larry Gibson

[abunaitoo]

Only way I can see to reduce time of flight, is to move the boolet faster.
With cast boolets, it can be moved faster up to a point.
To fast, and it will not fallow the rifling. Just slide out of the barrel.
My thinking with the slower powders, is that instead of a short hard push, it will give a softer push, and keep on pushing longer.
Don't know if it makes sense, but it's fun working on it.

[abunaitoo]

Well I tried a different powder again.
20.0gr, 20.5gr, 21.0gr, 21.5gr of Accurate 5744.
310di, 160gr GC
Seems to shoot flatter.
20.0gr seemed to be the best.
21.5gr started to open up at 50yds.
Have the sight set POA at 100yds, aim around 2" to 3" low at 50yds.
One problem is I only have a little powder left, and it's hard to find here.

[abunaitoo]

Back again.
I think I found a load that works for me.
IMR 4198...25.0 to 26.0. 160gr 309 boolet.
Depending on which rifle it going through.
Almost center aim at 50yds and 100yds.
I'm happy with it with this load.
Little more powder than I wanted to use, but this powder is easier to find than 5744.
On to the next project.

[abunaitoo]

I like this thread, I shoot 43 Mauser and 577 450 Martini, typical heavy trajectory that is essentially lobbing them downrange. I recently started shooting 6.5 Swede and have fallen in love with flat as hell trajectory (I hardly have to touch the sights for different ranges) and mild recoil. It is the best of both worlds. Velocity will be the main contributor to trajectory once it leaves the bore. Of course, not all twist rates and bullet weights/styles support higher velocities while maintaining optimal accuracy. There are some neat calculators online for ballistic co efficiency.

Mind sharing the load and boolet for the 6.5.
Next project are some Sweeds and Arisakas.