I have a couple JC Custom bbls. One on a 280 and the other in 308Win. Very pleased with early results so far.
JC is easy to deal with and is fairly quick to deliver.
https://www.jccustombarrels.com/Very interesting, I see they have 277 barrels from 1 in 7 - 1 in 12 twist hmm..........
When you say very pleased so far what does that mean, what kind of accuracy are you getting so far?