Unless I've thrown them away I have a couple of partial tins of #11 caps that you could have and we'd get them to you from Alabama. They are a few years old and always stored inside or in a weatherproof possibles bag from before I went to a 209 fired weapon. I never had one to misfire no matter how long I kept my caps so that's a statement on storage. I'll look for them later today and if I find them maybe we can figure it out. Worst case I could probably ship them as ammo. They'd still be free.
What brand of magnum primer? About the only primer I might be remotely interested in is the Federal large rifle magnum. I have several thousand 10s and 11s...Remington, CCI, and RWS.