Thank you for the info all & the ball weight elvas , so a .825 ball is not much less than a .835 in weight , would still be a good killer at 1650fps - 1750fps ?

I would need them to do a custom twist from 1 in 50 to 1 in 80 then ?
there barrels are 9 groove if that matters ?

Any one know another company from Pacnor that makes big barrels , I thought ED might have a contact ?