Optimal Barrel Time and Quickload

[dewey7271]

You have to keep in mind that burn rates are not determined using a rifle. They use a cylinder with a hole in one end. No case, no primer, no bullet no barrel. I think they use the same cylinder volume powder charge for all the various rifle powders? All you can say is all the powders were tested under the same conditions even if they don't relate to some particular cartridge or bullet.

Good point. I just thought the variance in one lot of powder between cartridges was interesting.

 

[Sheldon N]

Yes, and "burn rate" can vary bullet to bullet too. Some stuff like bearing surface Quickload can't account for easily and we end up tweaking burn rate to fudge the numbers. I shot two different 155g bullets (Scenar and Sierra Palma) out of my 308 with the same powder and had to use different burn rates to true up the velocities.