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Yep, only way more is zero scales with primed case on and weigh the water volume
they are only predictions, as always work up:thumbsup:
better than eating the case pressure, seen that once, don't...

predictions only 61.5Grains 2707fps 65kpsi, 62.5Grains 2750fps 69kpsi

Pressure goes up, 0.25 shorter drops 2.5 grains for the same pressure
PerazziSC3 beat me too it

197565

Have you got GRT? Those numbers are putting you at the upper limits of your pressure at 60.5grains 2209 and thats about predicting 50fps slower than your getting at 2677.
Have a play, because if its...

the 200eldx's- are you measuring to ogive or to tip? check that your not in to the lands at mag length
depending on how old they are Hornady had a few issues with differing ogives on some of the...

the 11 twist should be ok, I use the 200 at 2450fps and its accurate. longer barrel tho