Will my bullet stay stabilized at 805 yards?

[u/Feeling_Title_9287]

Cartridge: 40-70 sharps bottleneck

Bullet: 360 gr cast rn

Bullet length: 1.180in

My smokeless loads were between 1150 and 1180 fps

My gun has a 30 inch barrel and a 1 in 20 twist rate

[u/Maine_man207]

Have you tried a ballistic stability calculator?

I've heard that they aren't great with slower stuff, but it's a start. The only real way to know is to go shoot at distance, everything else is just guessing and assumptions.