I have app. 100 unfired Jamison cases that were formed from 45-90 to 40-70 then to 8X58Rd. No evidence of annealing. They will be used in a #5 RB action with a 45-70 C. Sharps "Old Reliable" barrel rechambered and fitted to this action. It will be used for silhouette shooting at 500 yards or less. I earnestly solicit advice, experiences, and suggestions on any aspect of the project. A top gunsmith will do the barrel work. My foremost request concerns inside neck reaming and outside neck turning for the 8X58 round and for 50-70 cases, also 7mm Mauser. Should annealing be the last operation before initial loading of the Jamison cases? I especially would like comments on Forster vs. Lee vs. Wilson tools, moderate vs. high dollar trimmers, tools, etc. Thanks now for any and all advice and comments.

Good info and advice Old-Win.  I have a couple of old 40X triple duece early benchrest rifles ( one was Mike Walker's ) both tight necked. I turn the outside necks in order to chamber but like you reaming is chasing your tail. I've sliced open enough brass to confirm what Old-Win says is correct. A lopsided case never stops at the neck the whole case is lopsided. 

Rick