Normally with a foaming bore cleaner you use a normal tight sealing bore guide, and shoot the foam in from the action end til it comes out the muzzle. Without the open end I think the trapped air would prevent the foam from getting where it needs to go.
The trick is getting the hose on the can to seal in the bore guide, without creating too much back pressure. On a 30 cal, no problem. 6.5 might have to start slow to get it going down the bore. 22 cal... haven't got that to work yet
I use the Delrin bore guides, but counter drill a 3/8" hole at the cleaning rod end, just deep enough so that the hose from the Wipe-Out nozzle seals in it and stays. That keeps all the cleaner where it belongs in the bore/chamber and out of the action. I also hang a Powerade bottle over the muzzle to catch the foam.
Eric