Ok so there is COMPLETELY conflicting information all over the internet about RL-17 and whether or not it is temperature stable. They claim it is, and some agree; however, many others do not. Most people who claim it is fairly variable with changing temperature agree that it changes about .8fps per 1 degree Fahrenheit of temperature change . I have also read that if you keep chamber pressures high (hot loads) then it stabilizes the powder. Can anyone confirm any of this? One last remark, if RL-17 is truly a temperature unstable powder, how much more so than H4350? Is it a big enough difference between the two powders to matter? I am getting ready to receive a custom 260 with a 24" benchmark barrel with an 8.5" twist, if anyone is curious as to what this information will applied towards.