I haven't dealt with the 209s here, we're limited to traditional style caps, #11 or musket, so I use the flangeless RWS musket caps which are fairly easy to handle and I slip a short piece of surgical tubing over it and the nipple to keep water out. With a cap inside a piece of tubing, it makes a nice little package that's easy to install when needed. The musket caps work well with T7 loose powder, never have used or liked the pellets, too expensive and I like to fine tune my loads, just not my cup O'tea! :wink: