I'll run some Wingyro numbers and get back to you Tim.



Methinks you've got a large gun cabinet??



Ok-- I'm learning something today. Can't remember ever looking at the 405 case-- which is a monster. 2.58" long and a rim dia of .543 with the base dia at .462 tapering to a mouth dia of .436 Bullet dia is .405-- I assumed a knock off from the 348 but it's an original. Teddy R's gun I think.



Using a 1.25" bullet with a meplat of .3 and a .5" nose length Gyro sez you'd be fine with even a 18 twist assuming you'd be going trans-sonic. But above that the 1.25 should even spin enough with a 20-21 twist. I'd guestimate that trial slug would weigh in the neighborhood of 350-360 grs using ww alloy. I use 11.125 for the specific gravity of the alloy being ww. The factory loading was a 300 gr BTW.



Sounds like some kinda woods/Alaskan gun....