Alright slow done here fellas. It appears there's some confusion. I gave up on the 228-1R and switched to a lyman 452374. That is what i am seating at 1.265.
I did some more doodling in the garage. I decieded to measure the chamber on the aftermarket barrel vs the factory. Measuring from the same spots on both barrels and taking 10 measurements of each, I found the after market chamber is .007-.008" shorter. I dont know the spec's but that seems alot to me.
Next I started playing with the ammo. I took some mineral spirits and cleaned all the lube off of 50 loaded rounds. I noticed one round that must not have seated straight and had some lead on the case mouth. So taking a scribe, I lightly scatched around the case mouth of all 50 rounds. I found 35 or so had at least a sliver of lead on the case mouth.
With that in mind I decided to load some more with an increased mouth flare as recomended here. I increased the flare a good bit and after 50 rounds checked the case mouth with the scribe again. This time only 2 or 3 had any lead and it was very minor. I think I'll flare the mouth just a bit more and see if I can get rid of the lead smear/slivers all togther.
I went back and re-examined the 228-1R's I had loaded and found several of them had the same lead build up around the case mouth. I still dont like how deep they have to be seated so I'll stick with the lyman.
I'll try and go to the range again and if the "cleaned rounds" work this time then I guess I've about got it.