Thread: 6.5x55 SE Sanity Check

Originally Posted by Magnetite

I had a look at how pressure and velocity increase in relation to charge weight in both the 260 and 6.5x55. Looks my initial figures where too high. Assuming a linear relationship (I know it's not but there's only two data points) and target pressure of 58,000psi (the same as the 260).
New maximum charges:
2209 47.5gr @ ~2800 w/ 24" barrel
2213SC 50.5gr @ ~2800 w/ 24" barrel

I will be reducing them by 10% and working up in 0.5gr increments.

Pressure and velocity do not run hand in hand. A lower velocity load may have higher pressure, or even a pressure spike, for a number of reasons.