I'm using between 42.7-43.0, depending on the lot, with rl 16 with 140 Berger's and getting 2730 with great accuracy. Rl 22 and 23 give me close to 2800 with the 147 Hornady and great accuracy. All speeds are in a 21" Fieldcraft. 26 gave the most speed but wasn't accurate enough for me.