Jerry,
FWIW, Most IBS Heavy Guns that use Barrel Blocks are running Straight 1.450" barrels. Some of the guys are shooting Tension Tubes w/ Palma Taper barrels. My HG is a BAT 2” Model “L” bedded into the 50HBR w/ the barrel floating. The barrel is 1.700” Straight for 9” tapered to 1.600” at 32”. Which is not much taper.
Baron