Black Powder Cartridge Rifle Calculations

[DCP]

Here is a another calculator

It calculates your fps.
I used it for a round ball and it should be close.


http://dragonflybridge.com/cgi-bin/MuzzleVelocity/Muzzle.pl

[Tatume]

Hi DCP,

I checked it against two cases for which I have measured muzzle velocities, and it was way off. The speed the calculator gave was less than half the measured speeds.

Take care, Tom

[DCP]

Can you give us the load info so. So we can see the problem

I was thinking the table should be close.Because it a Mathematical

you must enter your
barrel length
what kind of powder. (All powder is different) f ff or fff and the weight
weight of bullet


Thanks




Hi DCP,

I checked it against two cases for which I have measured muzzle velocities, and it was way off. The speed the calculator gave was less than half the measured speeds.

Take care, Tom

[Tatume]

Hi DCP,

Gun # 1: 16 bore British stalking rifle, 66 caliber, 32" barrel, one-ounce patched round ball, 130 gr Diamondback FFFg black powder, 1300 fps.

Gun # 2: 45 caliber Parker-Hale Volunteer, 32" barrel, 450 gr Lyman 451114 bullet, 90 gr Diamondback FFFg black powder, 1300 fps.

Your program returned 828 and 566 fps, respectively.

Take care, Tom

[Lead Fred]

It is a mile off. Said my 45 cal does 1360fps, not even close to the 2030fps
which is my standard load.

After using the Davenport formula to deterime the max load

[DCP]

This was from

Don Miller's formula for estimating muzzle velocity for black powder muzzle loaders, Round Ball.
[ From Black Powder Cartridge News, # 76, Winter 2011, pp. 27-30, and
additional email correspondence ]


There are 2 tables one for round ball and one for cartridge

Something isnt right.

Anyone know