The diameter in the grooves of one of those Barnes TSX 400-gr/.416-cal bullets that I sized down to .411":
0.395" +/- 0.001" after the sizing down, about same before sizing down, just now confirmed. Gerard Shultz used to laugh about how much under bore diameter the TSX grooves were. He said those grooves were cut with a bank of Dremel Tool cutting wheels after the bullets were hammered out of a piece of copper wire.
Ron aka "Rip" for Riflecrank Internationale Permanente NRA Life Benefactor and Beneficiary .458 Winchester Magnum, Magnanimous in Victory THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.
