I have no idea what use the OP has in mind for his reloads. All I can say is that for 12 gauge trap and skeet, 1 ounce of shot (8 or 9) is fine for Skeet, while 1-1/8 ounce (7-1/2) is preferable for trap because the distance from the firing point to the clay target is somewhat greater than in skeet, and a little more and a little heavier shot is better. 20 gauge loads are seldom used for Trap, but are used more for skeet. 2-3/4" cases in 20 gauge are fully adequate for skeet, along with 3/4 ounce shot loads. Red Dot is excellent for such 12 gauge loads while Green Dot is preferable for 20 gauge. And I will re-state my previous opinion - it makes no difference which primer brand you use with typical RD/GD loads. I have never even seen any European shotshell primers and probably wouldn't have used them if I had. I always used whatever primer brand was the cheapest/most avaialble, most of my experience being with either CCI or Federal. I have occasionally used Winchester and Remington 209 primers, but not often because I seldom saw them for sale. Long ago, I even used Herter's primers, but Herter's (at least as a company) is long gone. And I never knew any trap or skeet shooter who was the least bit concerned about which primer brand he used. At one time many years ago, Remington made a smaller diameter battery cup shotshell primer exclusive to Remington and Peters shells, but they stopped using it long ago. I have loaded some of the old Remington small primer pocket shells, and it is simple to do. Just seat a fired 209 primer to enlarge the pocket, then knock out the fired primer. Thereafter load with 209 primers.