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to do it correctly, you fill the case 1/2 way with water or place in jar with water to 1/2 case length, you will need to heat the top 1.5 inch of the case with a touch to red hot. let cool if no cracks at the mouth, if cracks, you must repair these while heat treading, , clean with liquid brass cleaner, apply hight temp flux, place hose clamp around lip, lighten until crack close, use a low temp brazing rod, heat red hot and apply rod just enough to fill crack, this will also heat treat the mouth of the case. , now you will need to machine or have a shop do it. you will need a round stock of steel about three inch OD and at 5/8 inch thick. you will machine a taper hole in the center of the round stock. only first 1/8 inch has the taper . hole ID is your final OD you wish on the brass case, plan on 0.005 over the size of the projectile, plus the total case brass thickness, now you have the case ready to resize. best to use a lathe, as i sometimes place a projectile of the proper size nose first in case. open chuck so not to touch projectile, carefully place case into the steel ring, slide projectile hose first into case. , move lathe post base slowly forward to push on the base of the case -keeping all align . now you must move the lathe base forward to push the case into the die you made. carefully remove the assembly, remove lose projectile from case. now you will have to drive the case from the die you made. i use a piece of pipe, place ring on top of open vise, pipe into case, insure case will fall free,, drive out the case and catch it before fall to the floor. use grease on die and projectile so you can get it apart. joe gatz CWO4 RT
The offending case mouth!
Nice 3 Pdr 2 Cwt's Tony, I've never seen one for sale, a rare projectile.
Quatermass
