The 20 Tac has been around awhile..I got mine Before Dakota arms contracted w Lapua to make formed brass..I used the seating die in my Redding FL set to pre-form the brass..I used my FL 223 die to de-cap & then clean/sort before pre-forming w the 20 tac seating die, stem removed..After that process..I used the Redding FL 20 Tac sizing die to finish the job...NOTE: some lots of brass did not have enough thickness in the necks to do the job..I have quite a few lots of mil spec & commercial brass that won't grip the bullet properly..one other caution on forming these small sizes of rifle brass..Please take the time to weight sort all the brass you intend to use..I have found some very heavy, and some light weight lots of 223 brass..Use the mid weights from your own sorts to start..I use Benchmark powder in my 11 twist Pac-nor barrel & Sierra 39gr Bullet...Good Luck, be safe..Mike in Ct