The 10 round halves from Federal boxes work fine and protect quite well. I slip them in a pocket.
I cut those in "half" - 4 or 5 rounds - whatever fits on the stock, and tape this to the stock, with the cartridges lightly taped in as well. I've lost too many rounds with those POS elastic stock holders. I don't like anything in my pockets, but I have been known to carry one round in each pants side-pocket. I also sometimes carry several rounds loose, or with the first option in my fanny pack.It has cartridge loops inside, also, but I have found those to be more trouble than worth.
I recently ordered something or other, and it came with a bonus 2-round patch to stick on the stock, which I did. I'm still working on a way to secure the cartridges , however. It may come back off.
It's been decades since I've had to dip into my "spares", but it's good insurance!
