Some batches of Shockwaves were sent out with wrong sized sabots if you call T/C and tell them the problems you are having they will send you out some sabots to fix the problem.

As far as the dreaded crudring thing goes.. All powders do it some less some more. T7 wants a bit wetter a patch in my opinion that's all. No matter what powder I shoot I never go more than a few shots between cleaning I want my target to reflect the shape my barrel is in when I hunt. (clean) So why would I adjust the sights to match a fouled out barrel?

If T7 did not perform so well I to would switch but so far nothing I have tried has matched the results I get with it. Someone also mentioned problems with the breech plug getting stuck. just pour a little water down the bore what a couple minutes and the plug will screw right out.