They used ‘03 Springfields in World War II too. And Marine and Army snipers were still using them in Korea and Vietnam.
For me, it would have to be bolt guns. I’d pick the M1903A2. Or a British Enfield No.4 Rifle (LOVE those...)
While I absolutely LOVE the M1 Garand (it was the first rifle I ever learned to shoot) and I have one, I think the bolt-action levels the playing field a but more. EVERY one would be handicapped by losing the sight picture from operating the bolt, re-acquiring the target, etc.,
And yes, there ARE many like it, but THIS one... THIS one is MINE, baby!! Haha!
You're right, of course. It would have to be '03 Springfields.