I'm not with you , you have to have whatever material that is in order to shape the projectile, so the lathery would just make the job easier than filing?
Thanks mate, You are on the money @Feet 'n Inches did mention previously but I only found one reference with the taper to the projectile.
That was what will make it look a bit more like a 7.62mm.
I picked up some resin after trying different methods to get the quartz to bond.
The different varieties was a learn as well.