I've only had one so this really isn't very objective but I won't do it again. I had a 3 groove Lilja on a 270 AM and while it shot very well, it Cu fouled worse than any custom I have had. It did however look pretty good under the borescope even after about 800 rounds out of that firebreather.
Lerch had one identical to mine and his did not seem to foul as bad so maybe I just had on that was prone to Cu fouling.
Pretty much what BJ said, but mine, the same barrel as his most probably, doesn't foul much at all.
The fast twist is is real hard on bullets. After 400 rounds the Wildcat 195s started coming apart. Which seems typical for about 50% of Lijlas of this design. The 169s w/the Corbin jackets do very well but are unavailable any longer.:mad:
Berger 150 VLDs twist like wet towels when jumped into the rifling. (per Kirby). I shot a bunch of them the other day. @ 35/3600 they were falling 5.5 MOA below the Nosler Ballistic Tips @ 200. When jammed they shot around 1 MOA. When jumped 20 thou they shot 9 MOA @ 200.
Accuracy is way better than I can shoot. The rifle more than meets the expected 1/2 MOA.
Velocity seems hard to come by in mine. 3050 Max w/ 195s. 3300 w/169.5s 3600 with 140s and 3500/3600 with 150 Nosler BTs. All using US 869.
I've found that 17% less of IMR 7828SSC gives the same pressure and velocity as US-869, w/the 140/150 weight bullets with much better ES/SDs.
Barrel life seems very good. I had it bore scoped, the smith estimated the number of rounds through it was about 1/2 of actual.
Would I do another one? Heck, I have no idea. Things have been learned in the last couple of years, and I go with current recommendations.