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Not sure what the book speed is but I'd imagine I'm slower than it should be. The day was perfect for the chrony too. Nice clear day 24 degrees or so in the middle of a paddock.
The powder used is ADI 2209 so fairly temp stable.
If it helps my load is
Lapua .260 Brass
140gr A-Max
42gr AR2209
CCI BR primer
22" MAB 1:8 barrel
There are many variables I know but I used 46grs 2209 in my .260AI and only got 2820fps thru a 24" barrel with the A max. For the same charge in RL-17 I get 2920ish with the same projectile.
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