This is getting exhausting as I'm trying to get guns out. However, saying the arrowhead system has leakage issues because it craters primers due to sloppy firing pin hole on the paramount is pretty disingenuous. The arrowhead bolt head allows the primer to interface with the factory paramount bolt face, so arrowhead portion doesn't have any interaction withe the primer. This is to allow work as a generic fit for intended use as a BH209 gun. Using for smokeless (as to your credit you have said) is definitely not intended as you have said. As I have previously said, I would do a bolt head similar to what you're doing which I assume requires factory bolt to machined back.
However, saying HIS seals when Arrowhead won't is false based on the pictures you've shown. Cratered primers is totally different than leakage. And even with the much larger expansion chamber of the HIS, I suspect you have have seen similar results using HIS in the identical situation.
The primer extrusion you're seeing is similar to what used to happen on the old Hunter Bolt Nose kits with smokeless guns until I did a redesign with a much smaller firing pin and tighter tolerances on the firing pin hole.
However, saying HIS seals when Arrowhead won't is false based on the pictures you've shown. Cratered primers is totally different than leakage. And even with the much larger expansion chamber of the HIS, I suspect you have have seen similar results using HIS in the identical situation.
The primer extrusion you're seeing is similar to what used to happen on the old Hunter Bolt Nose kits with smokeless guns until I did a redesign with a much smaller firing pin and tighter tolerances on the firing pin hole.