I have occasion to make up some more 300 Weatherby loads. I have a "tried and true" recipe developed but was running low. This time, though, I annealed the brass using an AMP annealer. Using the same lot of IMR 7828SSC, I saw a 200+ fps drop in velocity (Labradar, shot old and new at the same session). I certainly wasn't expecting that and the accuracy wasn't good at all, which isn't surprising given the velocity difference.
I applied a light crimp with a Lee FCD and the velocity came up, but just a little. The bullet is a 168 TTSX and the length is such I'm not where I can crimp into a groove.
I'm not sure I can get enough powder into the case to get my velocity back. I could run more neck tension (I was using .002" measured) but could easily bump it up) or apply a heavier crimp - would that make enough difference?
What's the writer.wisdom on the effect of more tension and crimping on velocity?