what to do? fish!
What I actually do:
I find as much published data as I can (I've been collecting data since 1975).
I find the lowest START load published.
I find the highest MAX load published.
I make up start loads somewhere in the middle.
Like your example; I'd start at 5.0g, your primer and case and bullet, OAL (this is based on both the specific bullet chosen, and the specific launch platform) of 1.120--1.145".
I can't offer an exact OAL without more info on the specific bullet.
I make ten test ten. Work? Make and test twenty.
Blew up the gun? Back off your charge.
Didn't function reliably? Confirm a functioning OAL, and then work upward in .2g increments.
Change ANY component? Start over.
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"all my ammo is mostly retired factory ammo"
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