.22 Super Jet

[Handgun'r]

Rocky,

Yeah, thanks......that's about what I figured.

I'm using a nominal 35-40 fps, per inch of barrel deduction from 24 & 26" barrels as a standard.
It comes close to the velocities listed, more or less.

I was looking for something around 3000-3200 anyway, so it should be about right.

Are other useable cases, like the .22 Rem Jet, and the necked .256 Win Mag, any different as far as pressure ?
Based on the same case design, I'm guessing not, but don't know for sure.

I'm assuming that the pressure limits that you're referring to are based on the safe, or working limits of the case head & web.....?

I'm just wondering how much those figures change when the cartridge is necked down, or how differently it reacts to doing so.

Thanks again,
Bob