I have used RL22 in .243 under 95gn Nosler BT's. Nice and gentle, not too fast and sub MOA accurate.
Here's some ideas. http://forum.accurateshooter.com/index.php?topic=982860.0 I've had some success with N160 recently. Regards JCS
3870 FPS with a 90 gr bullet,are you sure as I think your chrono is brokenjust started playing with r15 up to 90 grains lapua for range work looking good so far got 3870 fsp so far ,more to do yet
3870 FPS with a 90 gr bullet,are you sure as I think your chrono is broken
Have you thought of trying reloader 17 or Elcho 17 (same powder but cheaper in a kg can)? It's a very versatile powder see below for 243 load data
Alliant Powder - Reloader's Guide
Rick
Has anyone got any experiance in using reloader 17 for a .243? Did the velocity match what alliant claims it can on their website?

tried it didn't get on with it,its more suited to the heavier calibers,a 243 is a peach to load for up to 75gr Vit 140 80 to 100gr Vit 160
looking at Paul O reply 3800 fps with RL15 and a 90gr bullet,that seem to be the kiddy,but Iam still waiting for verification on this magic load![]()
just started playing with r15 up to 90 grains lapua for range work looking good so far got 3870 fsp so far ,more to do yet