I agree with Smith043…… bearing surface much shorter on Berger than that 77 MK.
If you re experiencing no signs of pressure in bolt lift, primers and case expansion at our below your 77 MK load, then I d increase your charge weight in .3 gr increments. See if your accuracy stays h CJ insistent and if so you ll have your cake and eat it too!!
(.3 gr increases will probably net you around 25-30 fps on each increase) Go if slowly if you decide to pursue this.
If you re experiencing no signs of pressure in bolt lift, primers and case expansion at our below your 77 MK load, then I d increase your charge weight in .3 gr increments. See if your accuracy stays h CJ insistent and if so you ll have your cake and eat it too!!
(.3 gr increases will probably net you around 25-30 fps on each increase) Go if slowly if you decide to pursue this.
