Over the last year or so, I've been shooting a GA Precision bolt rifle w Defiance Templar V2 action, McMillan A5 stock, Jewell trigger, 30" Bartlein 5R barrel (M24 contour, .218"/.224", 7-twist). Load is Lapua brass, Fed 205 primer, 24.0 gr H4895, Berger 90 VLD seated at ~.015"
off the lands (chamber was cut with PTG Rem ISSF reamer - 0.169" freebore). Velocity at the sweet spot needs to be very close to 2850 fps, so optimal charge weight may change slightly from lot to lot of H4895. The predicted pressure for the 90 VLDs at 2850 fps is ~56-57K psi, and brass life is not so great; maybe 3-4 firings before the primer pockets are gone. Although frequent preps of new brass are somewhat of a PITA, I don't really worry all that much about brass costs when I'm winning competitions, primarily because I have a special tree in my backyard:
For those that insist on longer brass life, using a Varget load at somewhere in the neighborhood of 2800-2820 fps from a 30" barrel may be a little easier on the brass and extend its life further.
In 2015 using this setup, I came in 2nd place in F-TR at the Santa Margarita Gun Club Midrange Regional at Camp Pendleton, 1st Overall in F-TR at the Nebraska State Midrange Championship, won 1st Overall in F-TR at the California State Long Range Championship, and won several local matches including a 150-15X clean at 300 yd I was very pleased with that grouped well under one half MOA:
IMO, you really can't go wrong shooting 90s out of a .223 in F-TR out to 600 yd. They can be loaded with very good precision to velocities that simply aren't giving up very much to [most] .308 loads. At 1000 yd it's a slightly different story in that you'll be giving up substantially more wind resistance to someone shooting 200 Hybrids (or better) out of a .308. However, the .223 shooting 90s will hold it's own against most .308 load using 185s or less, even at 1000 yd. Further, the lack of recoil is certainly worth something in terms of accuracy/precision when compared to a .308, even one shooting the lighter 155s. The .223 is simply a pleasure to shoot in F-TR and it can most definitely be competitive.