Seems like a small niche market, how many books do you think that you'll sell?
Honestly, I don’t know. I don’t write to sell large quantities or to satisfy the main stream. Just to satisfy a personal need.
I make old timey jacketed bullets from rimfire cases and improve on older designs. I install 1 in 9 twist 225 Winchester rifle barrels like what should have been done to begin with.
It’s about whatever itch I need to scratch, like re-doing 303 British rifles with .308 barrels or shooting single shot 7.62x39 rifles with 308 diameter barrels.