Help! 300RUM load problems
I just bought a new 300rum sendero and have been working up loads for it. I have tried both the Barnes 168grn TSX and the 165gr Swift Scirrocco.
The problem I seem to be having is that I am seeing ejector pin shiny spots on the case heads (slight ones, not raised).
I am seeing this over pressure sign at less than the max load listed by the manual and my velocities are way below the book too.
I have tried RL25, RL22, and H1000. I seem to top out 1 to 2 grains below max listed load, but with less than speed than the manual states.......example: RL25 94gr, Barnes 168gr TSX gives me 3240fps with the above mentioned over pressure sign. The manual lists 94gr as the max load, with a speed of 3448, I'm 200fps below that!
By the way I am using an Oehler chrony with 3 skyscreens so it should not be the chrony.......
That example seems to hold true for the other loads I have tested.....I am running 150fps to 250fps below published velocities.
Long post, I know, but I had to explain the problem. Any ideas or explanations from you 300RUM experts out there would be greatly appreciated