Hi Brian
.280 and .280/30 vary greatly in price depending on the scarcity of the round. The more common types can change hands for £5 at an E.C.R.A. meeting, however some particularly uncommon variants can be in the hundreds of pounds per round. Just depends what it is. I collect these things, so if you would like to drop me a p.m with the headstamps, and ideally a picture I can give you a better idea what they should be priced at.
Cheers
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