Had a couple Bond arms 4.25" derringers, one was 410 3" /45lc, But being a old ,but wimpy guy I never shot 3" hv or hot 45 out of them.
Cheap shorter 410 was not bad and cowboy 45 was fine. Friend of mine way younger shot 2 rds of 3" imperials slugs I had been hording.
2 was all he wanted to do. I never measured the bore, but you had 3 +in of chamber and 1 in of rifling, which did not much for the 45 and buggered the smooth bore 410 idea. But who cared.
You could keep these on the paper at 10 yrs, if you got use to the trigger, they where a ##### to figure out the way the trigger pivoted down
on the pull. If you took off the trigger guard strap, they worked good, for what they where made for ( car jackers at 2ft)
I also had one in 38/357, nice caliber , but I sold it before I got a chance to try it. they also have a 9mm barrel, and a 22, but too much$ for a 22