I have had one on a Savage 10FP build since about 2003, 260 Rem SAAMI chamber, 28" length, 1:8" Twist. I have fired it somewhat sparingly because replacing it could get pricey. Current round count stands at around 1000-1200 rounds. Some years back, I had a discussion with L-W regarding bore life expectations, based on throat movement (very small at the time, still kinda small) and loads, and we arrived at a number right around 2400. Since then, however, my loads have been decreased, so I'm kinda in the dark about bore life projections. L-W's LW-50 Stainless has a reputation for toughness and extended bore life.
I have been totally satisfied with this purchase. It was intended for F Open 1000yd competition, and did as well as my own limited abilities could permit over a couple (three?) years at Bodines/"Williamsport" in PA.. I am currently doing a fairly slow process of load development using the newer Hornady 143gr ELD-X. with H-4350, and may also try H-4831SC. Since I now live and shoot at about 4000ft-4500ft ASL, velocity no longer carries the premium it did when I previously seldom got above 850Ft ASL.
Mine was identical to the L-W drop-ins, but ordered several years before drop-ins became a stocked item. Since L-W is currently reorganizing their US website, I have some difficulty identifying whether or not the previously available drop-ins remain a stocked item.
L-W is essentially the world's largest producer of custom and OEM barrels. Their custom lapped barrels are claimed to go beyond where other makes do, and I cannot find any fault with this description. When I got it, I began the fire, clean, fire, clean process; but the barrel completely stopped showing copper deposition after the 7th round, and I quit the process after 10 rounds.
The next Upper I build will employ a L-W barrel and matched bolt, will be intended for precision, and there will probably be more after that one.
Greg