I had one built by IBI on a 1975 Rem 700 action when my Kimber was getting close to needing a new barrel. Didn’t want to be without a 223AI while it was getting done.
That one showed up in October, so made an educated guess on a load and loaded up 5 rounds. Those landed in a little cluster so called it good enough for the season and rolled up 50 rounds. Those ones ended up doing 2740fps. Best buddy watched that rifle smash an immature moose and a big black bear, and he shot a couple coyotes with it and decided he needed one that winter.
Had one spun up for him by IBI as well, and his showed up and due to time constraints I went with the same load in his, his does 2780fps.
My kimber came back, and that one has a KS Arms tube, done by Corlanes. Just enough difference in the chamber that brass sized for the kimber is very difficult to close on in either 700.
However, same load in that one gets 2612fps.
Not leaning on it and no actual load work up, just picked a load and ran with it. All three are an inch or better for 10 rounds at 100 so good enough for what we do with them - kill stuff and shoot for beer can braggin’ rights at 6-7-800+ yards.
At 2700fps that gets you to about 600 yards maintaining a 1800fps impact velocity.