RB 410 and brass hull

[Littlewolf]

fire formed 9.3x74R 3" brass hull 410.
20gr FFFg Pyrodex.
1/2" of .064" basswood plywood.

how many .410 RB is too many, pressure wise, or is this a bad plan in a full choke NEF?

[turtlezx]

whats the dia of your choke ?? ????ing .380-.390 does not sound like a good idea. Go to smaller rb or cut you barrel back to cylinder choke

[Nobade]

I've been doing the same thing recently. 45 grains of 3f, a circle fly .430" nitro card, lubed cushion wad, and three .399" balls. My choke is .391" and the balls are a thumb press through. They work very well and hit close to each other. As long as they go through your choke they will work. Just put as many in the case as will fit. This is for black powder! Use published data for smokeless.

[Littlewolf]

Nobade: thanks published BP data I've seen for 410 shot / ball / or slug was 20gr FFFg.
which handily I have a 20gr spout on a BP flask for my 32 and 36 CVA Mt Rifles

[Littlewolf]

also I found that .445" is a real nice fit to hand plunger seated bar coaster and or .032" basswood plywood laser cut wads in my magtech or reformed 9.3x74R hulls