I have several 300 Sav rifles. All have done well with RL-15, Win 748, IMR 4064 and IMR 4895, which is great with 180s. As others have said, there is a ton of data out there. With 165s and my 99s, i seem to always end up with my best groups in the mid 2400 fps area. I had a 99 in 243 lock up on a less than max load so i now just accept that they are what they are and enjoy em just as much.
