It's "never a dead issue" when Omegas/Encores are new or used. All of our bores are different in this sport ... unlike centerfire world that keeps the manufacturer more in-line (no pun intended) with much stricter bore guidelines. Takes a while for that flashole in new T/Cs & some other manufacturer bores to enlarge. The larger the hole gets by firing the ML -- the bigger the hole gets -- the more that crud ring lessens.
Winchester Triple Se7en primers help reduce the crud ring until the barrel slowly-but-naturally reduces the ring thru shots fired. 777 and Swiss powders generate more energy and heat, so naturally those two powders will enlarge that breechplug hole faster than Pyrodex, real black, APP.... etc. So the new primers are not the cure-all -- just a very good bandaid.... actually the best bandaid there is in 209 primers right now - to combat the crud ring issue.
I stayed the course with my T/C ML breechplug. It ended-up costing me around $10 more for patches to clean that crud ring, but now the ML has very little crud ring issues. A swabbing patch every 2nd shot shows no patch-clutching, grabbing or ramrod-seizing anymore.