Most def.
My perspective at the time I was shooting 1.1-1.3 MOA five- and ten-shot groups at 100 yards with the RCBS bullet and 12.0 grains of 2400 was more like "If it ain't broke, don't fix it". Grouping largely held up at 200 yards, too--1.5 MOA. So trans-sonic disturbance wasn't destroying things, but wind in Ridgecrest sure as &*^% could and did if I didn't wrap up the shooting by 1 P.M. Warm desert zephyrs......called "Gale force" in some locales.
Inexpensive, accurate loads that my girls enjoyed and that whacked jacks and ground squirrels decisively. If I re-venture into 243 Country again, I might try pushing the envelope a bit harder. I have seen evidence On Paper that 1-8" twists seem to have a fixed cast bullet speed limit of about 1600 FPS (the now-departed 25/35 WCF), and the 1-9" in my Ruger 77R in 6.5 x 55 Swede starts going 'Improved Cylinder' with #266469 at about the 1800 FPS mark. 1-10" stays civilized with a number of 30 caliber bullets to about 2000-2100 FPS in 30-06; this is the same twist used in 243 Winchester. FWIW.