You will probably find they will speed up a bit as your barrel breaks in properly.
I’m getting those speeds out of my Creedmoor give or take with a 143 grain ELD X and a 24 inch barrel… about 700m alt. on a warm day. It’s a fairly warm load of course.
Talking to my cuz who is running a semi-custom PRC in Colorado, he also wasn’t that impressed with the velocity gains. At the end of the day you are dealing with diminishing returns trying to get that case to push the 140s and 150s that much faster. Compared to the Creedmoor your powder charge is likely to be around a third heavier for a 10% max velocity gain, probably more like 7 or 8%.
If you can get the Berger to work like @veitnamcam then you are gaining a bit more thump down range as well thanks to the weight & BC.
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