TexasCHLforum.com

There are many variables in reloading. The powder charge and OAL are only two of them.

First: is all your brass identical? Same manufacturer, same weight, same number of previous loadings?

Weigh your brass. That will quickly tell you if the internal volume is the same.

Next: weigh your bullets. I know, you paid good money for them from a known manufacturer. Weigh them anyway.

Finally: weigh your powder charge. It's always hard to get consistency when measuring powder by volume. Weight is absolute, but volume varies, and weight (mass, actually) is the only true measure of the amount of powder.

Benchrest rifle shooters weigh every charge, and use powder tricklers to "sneak up on" the exact charge weight. You can't do that with pistol ammo, at least not if you hope to shoot another IDPA match in this lifetime. But you can check your volume measure by throwing every fifth charge onto the scale, and taking careful notes about consistency.

Kevin