It’s a good question. Grind away till you can’t grind anymore. A little tidbit if you’re new to tig too is to make sure the grinding marks are always parallel to the tungsten and not running in some kind of spiral or similar. Keeps the arc stable and over all a better time when you’re welding.
I melt mine down to make ammo for my M1 Abrams. In this economy it's hard to find depleted uranium at an affordable price. Although not ideal I find the density of tungsten to an acceptable substitute for my 120mm cannon rounds.
