For what it is worth:
From smallest to largest:
CZ527 .221 Rem
Rem Model 7 .223 Stainless
Rem 788 .223
Rem 788 .25-35 (custom)
Rem 700 Stainless .257 Roberts
Turk Mauser with Swede barrel 6.5x55 (custom)
Rem 700 Classic 6.5x55
Zastava Mauser 6.5x55 (custom)
Rem 700 Stainless 7x57 (custom)
Yugo Mauser 7x57 (sporterized)
Mark X Zastava 7x57
Ruger 77 7.62x39
Rem 700 .308
Rem 788 .308
Zastava Mauser .308 (heavy barrel)
Yugo Mauser .308 (Wilson barrel, sporterized)
Rem 721 .30-06
Rem 700 Stainless .30-06
Springfield 1903 .30-06 (sporterized)
1917 Enfield .30-06 (sporterized)
Rem 700 Stainless 8x57mm (custom)
Yugo Mauser 8x57 (sporterized)
Yugo Mauser M48BO
Rem 721 .375 H&H (Rem 700 Stainless barrel)
This does not include assorted rimfires, semi-autos, lever guns, and single shots, or actions sitting around with no barrels in them.
Why? Simple. If a Remington isn't accurate, it is rarely hard to get it that way. And I'm talking MOA or less every time. I like the extractor of the Mauser, I think it is more long-term reliable (I have had Remington extractors break or stop working). I have had several Ruger bolt center-fires, and never could get any of them to shoot reliably MOA. No experience with other makes, but the CZ550 looks interesting.