I just had a weekend in the gopher patch, 200 rounds fired from this 6mmBR, 50-600yds - Benchmark barrel, 31.2 Varget/87vmax/450. Just over 1400 rounds thru this one, it shoots like most 6mmbr's do...
Used the thorro-clean product - Before thorro, i put thru one wet patch of kroil, followed with a dry patch, then followed by two wet CLR (one push thru, one back and forth, and FYI my barrel has had no warranty for years so i like using CLR), followed by three windex wet, follwed by three dry patches
Then two wet Thorro-clean flush (one thru, one stroked back and forth) then a blue Iosso brush lubed up with Thorro-clean, and 15 strokes (Back and forth = 1 stroke, reapplied goop after 7 strokes), followed by three wet Thorro flush, followed by a couple dry, then Kroil patch, then three dry patches. First patches of session were dirty, especially after brushing - but cleared fast with the Thorro-flush.
Finished with a chamber clean and a final dry patch, last patch was almost pristine
Holy schmokes did it work - video below speaks volumes. Wish i had a 'before' video now...... The usual thick carbon ring was not there....happy happy happy.
This was the fastest, best regime have tried that works for me
https://youtu.be/GBSx1qG0NRM