More than a month ago I did everything Johnny did in his video on my own except I used a Hornady 6mm ARC FL die instead of the RCBS SB die. I did not get the small ridge at the case head when resizing once fired 7.62x39 cases. Also, I didn't have to size those cases to 6.5 Grendel first. None of the 15 cases I resized collapsed at their shoulders when I ran them through the Hornady ARC die. There were 5 different manufacturers among the 15 cases: Remington (SP), GECO, Federal, PMC & one of unknown origin (head stamp is IK).
With new Starline & Hornady 6.5 Grendel brass: resized, trimmed, primed & loaded with 25gns Reloader 7 & Sierra 85gn Blitz King bullets.
With new Lapua 220 Russian brass: Necks expanded to .242" inside diameter, trimmed, primed & loaded with with the same powder charge as above. Used 70gn Varmageddon bullets seated to touch the rifling.
Unfortunately, I've not been able to get to the range to fire-form any of these cases. I hope to do that soon.
With new Starline & Hornady 6.5 Grendel brass: resized, trimmed, primed & loaded with 25gns Reloader 7 & Sierra 85gn Blitz King bullets.
With new Lapua 220 Russian brass: Necks expanded to .242" inside diameter, trimmed, primed & loaded with with the same powder charge as above. Used 70gn Varmageddon bullets seated to touch the rifling.
Unfortunately, I've not been able to get to the range to fire-form any of these cases. I hope to do that soon.
The trick is growing up without growing old. -- Casey Stengal