I've done ladder tests of a few guns over the years. I generally get good results from doing it but the trick is you need distance. 200 yards is a bare minimum, 300 is better. What distance were you shooting when you did your test?
I have been loading the 300 WSM and started with 10% less of the maximum charge. Then worked up to 95% and 100%. The 95% load of RL-17 is much more accurate and that equates to 62.7 Gr. of this powder. I use Federal 215 primers and Fedral Brass. I hope this helps in your loading.
JJ Division
Linear Mode
