Although mine was bought new and not surplus,
My HK-91 in 308 is almost as accurate as any bolt action I have ever shot.
The Brass normally is not damaged, it just has black lines on it
from the chamber flutes. This actually is supposed to help extraction
of the spent case.
The most accurate bolt rifle I have ever fired, is a model 1891
Argentine Mauser in 7.65x53 cal. I own this rifle now but do not shoot it very often due to its "mint" condition.
I am a collector, and I normally go by what it is and not how accurate
it is anyway. Besides, One of the most in-Accurate rifles I have fired
is actually called the best all-time bolt action battle rifles, The SMLE.
(But I still have 5 of them!)