I still have 3 contender frames, 6 barrels & 4 stock sets. I had 2 Encore frames, 5 barrels & 3 stock sets. I had new trigger speings put in, that solved the trigger problem but nothing could solve the inconsistancy problem.. 1 day they were 1" rifles next day 3" rifles &the POI was always moving, solved that problem by selling them at a loss.
I too have had that inconsistency, but it has cures.
Switching barrels sometimes but not always, may need a round or two to settle in. Not a problem, as I always shoot a few fouling rounds regardless of the gun make before getting serious. Number 2,,, tightening up the forend unevenly will do it too. I use a torque driver on mine. Then too, be sure the forend (ears)rear, are not contacting the frame. And most importantly, no lube of any kind on the locking bolt and it's frame recess contact areas. If those don't fix it, then it's possible, an iffy frame got out the door. Or it is stretched or stretching by overloading. Like anything else, it does have limitations.
Now some go to hangerbars on the forend, and oversized hinge pins also. I personally haven't found either to be necessary. However, the firearm ain't without fault's, but it's still a very versatile system for the money.
On another note,,,,, most of the the detractors I hear from, have little experience if any, with the TC's. I don't know if it's jealously thing going on, or what? I do know when I go to the range, I have left more than a few sitting there wondering how I can out shoot them.
And yes they are marketed like no other. But marketing dollars don't mean success. The TC's got their market share for reasons beyond advertising dollars.
Like anything else, there will always be those whom swear at something, and those that swear by something. And as I mentioned, I do go custom barrels, that's just a personal choice. For the normal hunting ranges I shoot on biggame, I don't need those either. I would do that on some bolt guns as well. And today, 600 bucks dont get alot anymore, but I would have twice tied up what I do, if all bolt guns.