I started a load workup with Berger 130 GR OTM bullets and this is what I came up with the first day out.H4350 powder.
Have you ever came across this?
These are 3 shot groups out of my 6.5 Creedmore.
I'd keep going up in charge weight. I ran 43.3 at 2850 for a good while. Id bet 42.1 is around 2750 fps maybe less. Ignore the book max. For 130's in a creedmoor I usually start around 42.5 grains and work up to 43.5 with H4350/4451.
Theres no problem at all. I just haven't ever ran across these type of groups with a difference in powder charges like this out of any of my 6.5's. I have 3.
These loads ran from 2750 to 2800 FPS