Magnums? Absolutely! For reaching out and hitting a target at distance faster is better. I would even make the case that th .243 is a magnum.

For me it's shooting LR and ELR at steel targets. More velocity means less drop (obviously) but less wind correction (most importantly). At the last class I took it was very educational when my instructor put me on the spotting scope to call shots for him. He was shooting older .308 military match loads (168gr SMK) and compared to my 6.5SAUM it was night and day. Wind calls were about 2X more for him but the killer was range, it was amazing watching the bullets lose stability around 900yds. It's one thing to read about the stability issues of that bullet at 1000yds but it's another thing to see it in action.

Anyway, I'm a committed ranger and dailer and only use holds to correct. Corrections are almost exclusively for wind as I've verified my ballistics out to Range so I guess I'm on the scientific end of things.