Re: Barrel throated for VLD bullets
It mostly has to do with lead length and lead angle.
The lead is what is typically called free bore, or the area cut away for the bullet to rest in as it purtrudes from the case neck. The lead angle is the taper cut on the lands to engrave the bullet.
The lead angle of 1.5 degrees is typical for VLDs, the lead length is determined by bullet used, magazine length and choosen oal of your cartrige.
Send your smith a dummy (new brass)with the bullet(s) you plan to shoot.
If he's good he will give you what you want.