The cartridge is too long for an inerta puller? Well color me 'surprised' again. But come
to think of it - I said that in my original post.
The cartridge in question is 'rare' if you live in the American cartridge world. Otherwise,
it's anything but rare.
As to nominal bullet diameters, they were standardized in the early 20th Century. As you know already, what a literature search reveals is that nominal diameters are approximately .408 to .411 (Nitro) and .405 to .407 black. Bullet makers like Barnes would certainly know
what original factory diameters were.
Drilling a small diameter hole will somehow change bullet dimensions? You shouldn't be smoking that stuff.
Good luck in your circuitous search for the most complex solution.
PS - You might want to check with Superior Ammunition in SC. If they supply loaded cartridges, they likely have some 'grip' on proper bullet diameters.
