You might still be. Like these folks stated, your gun has a lot to do with it. Some lots of powder are faster than others. There's also the cases. Some cases are thicker, harder, softer, etc.... Primers can be hotter than others of the same type.

My Barnes manuals use a 24" barrel, even for Weatherby loads. I've tested a few and was close. Better news was that my loads were of similar velocity to each other. That lack of variance means accuracy.

My most disappointing time out with the chrony was with factory 30-06 rounds. 180 grain bullets were barely hitting 2500fps.

Do you have a chrony, Mauser? I bought the Shooting Chrony back in the 1990s for about $120 or so. It can be fun. I brought it to work one day and we were shooting paper wads through it with rubber bands. The slower ones didn't even register.

The good news is, I haven't chronied a load in several years. But they still flatten deer and pulverize watermelons