Test-fired the Ruger No.2 chambered in .416x.348 Winchester for function and to get an idea about QuickLOAD’s ability to accurately predict muzzle velocities.
Here are the specifications:
1) MagnetoSpeed chronograph
2) 400-grain Hornady “Dangerous Game” round-nosed bullets (out of production)
3) 34.5 grains of IMR 4227 powder.
4) Seating depth of 0.495″
5) Overall cartridge length of 3.048″
6) Bullet between 0.050″ and 0.060″ off of the lands when a round is chambered.
Here are the values input to QuickLOAD. All of the values have been measured, not estimated.
Here are the input values for the powder.
Here are the outputs. First, the predicted Pressure and Velocity vs distance-traveled-in-the-barrel curves.
And finally, the predicted output with Max Pressure, Muzzle Pressure, % of powder burned in the barrel before bullet exit, etc.
As you can see, the predicted muzzle velocity is 1719 f/s.
Actual MVs were:
for and average of 1617.7 f/s. Which is, on average, 101.3 f/s slower than predicted by QuickLOAD.
By lowering the charge to 31.6 grains of I4227, I can get the predicted MV down to 1619 f/s. At that MV, the predicted Max Pressure is 25,548 PSI.
This exercise was conducted to test function AND get an idea about how well QuickLOAD was going to predict MV and by inference, Max Pressure. I got that information. Mostly. The bullet I intend to use primarily for hunting is the Hawk 400-grain spitzer, and the powder is Accurate 2495. Accurate 2495 powder MAY behave differently than IMR4227. I’ll have to check that once I have the stock finished. Then I will be able to also work on sighting in the scope with the specific load I intend to use.