Hi Richard,You can do this two ways.You will need an unfired shell as a reference to get profile correct,whichever method you choose. Remove old band carefully,measure A,width of band. B,depth of band, You MUST allow a couple MM extra depth to allow for final machineing and rifleing wear.Obtain a STRIP of new copper of correct dimensions and a bit longer(just in case!!!)This can be carefully tapped into the recess in the shell,leaving a slight gap where they meet(aprox 2mm),then welded using either a tig welder or gas welder.Then machined in a lathe to match correct profile.The other method involves making a copper RING that is a tight fit over shell,same width/Depth as before,then getting this pressed into the shell.(Hydraulic hose crimper works ok)Machine to finish as before.The biggest problem is finding someone to do it!The second method is the neatest as it doesnt discolour the copper band.Dont know if this helps. Tigbrand.(ps Bovington was a washout!)