Ideally you look for Z1 and PMax to be as close together as possible. The built-in Ba values in QuickLOAD are very good averages.Īfter you have a baseline of data into QuickLoad (fired brass case capacity, chrono data) you can really start to tweak it. If you have a powder that has known to be stable from lot to lot then you can use a different load that uses that powder and as close to the bullet weight as possible as a baseline.
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You can sort of get close, but you're really just guessing at the burn rate for that lot of powder at a particular temperature. If I need to adjust more than that for the burn rate (Ba), something is off.Ĭontrary to popular believe, it's somewhat difficult to use QuickLoad for an initial load (outside of checking gross overpressure boundaries). Yes sir that's the basic idea, but I never adjust more than 5 to 8 percent. Projectile travel time from 10% Pmax to muzzle = 0.97 ms energy at muzzle = 2141 ft.lbs Fraction of powder burnt = 99.5 % = 62923 psi Way of projectile at Pmax = 1.99 in Solid density (gr/cu.in)= 406.4 Weighting factor.= 0.5īurning rate factor Ba(1/s)= 0.43 Pro-/degressivity factor a = 1.348īurning limit. Heat of Explosion (cal/lb)= 411694 Ratio of spec. Seating depth (in)= 0.530 Volume displaced (gn H2O)= 7.13Ĭomb.chamber volume(gn H2O)= 43.47 Projectile travel (in)= 15.110 Length of cartridge (in)= 2.810 Length of case (in)= 1.920Ĭase capacity(Grains Water)= 50.60 Length of projectile (in)= 1.420
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Projectile weight (gr)= 147 Groove caliber (in)= 0.264 (Piezo CIP)= 63091 psi Shot start / init pressure = 3626 psi Case capacity and propellant properties may vary considerably from lot to lot!Ĭartridge.