It isn't an issue. There have been a few times when shooting the Sneezer that it ignites but it just sizzles for a few seconds. Hasn't happened with the .22. I have shot RF ammo with and without the can and it makes no difference in regards to precision. It does cause a POI shift but it is very minor with the .22.
Only time I ever wiped between shots was with BP loads in the Sneezer.