I bought one pound (shoulda bought more) of it a couple of months ago. I had a terrible time finding data. I called Alliant and asked for starting loads for 7x57 and the 257 Roberts. The guy I talked to said RL-17 would be an excellent choice for those calibers but had no idea where to start because Speer was doing all the testing. The funny thing is that he didn't tell me not to use it, instead he asked me to call him back with my results after trying it. To make a long story short I started with 7-08 data for the 7x57 and accuracy was excellent. I got over 100 fps faster than my max loads of RL-19 or Imr 4350. I haven't gotten around to trying it in the 257 yet.
