Originally Posted By: KyleWoods...some way of estimating muzzle velocity based on powder,.(etc)..
Eng-2-Eng,, TMI,,, here's how I take a swag at a new load, given powder, projectile, barrel length:
Green #s are simple arbitrary inputs of intermediate trial powder loads.
The red# (-120,) is an input taken from Berger manual 1st ed.
the red#s (46.6, 49.0) are inputs, taken from Hodgdon www.
The red#s (2542, 2708) are results of fps plus barrel length adjustment, fps inputs taken from same www site.
Slope is calculated from line 45 and line 39.
FPS #s in black are linear interpolation using Slope.
Certainly not a true linear relation, but easy and useful anyway.
www site didn't have the 168 amax so chose 168 SIE HPBT as a substitute.
These intermediate FPS are based on www site data, which has been amazingly close on a few earlier examples.
Have a chronograph and use it to confirm FPS, but do a lot of testing using method above and looking for accuracy nodes, w/o chrony.
Normal caution applies about working up toward a max load.
