Judging Roe Bucks in the field is not that easy. As Stag as already pointed out the difference in weight can be remarkable when one picks up a prepared and dried head.
Judging by length can be a good indicator, but for a medal head the antlers have to be at least half the length of the ear again. There should be good thickness to the bases and nice pearling evenly spread across.
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Here you can see 2 freshly prepared Roe Buck heads shot on my ground from 2 years ago. They are almost equal length, but the left hand went high gold and the right hand was mid silver. The silver was a much older beast.
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This gives you a slightly better sense of scale of size, and they are not held out in front to make the heads look bigger either!
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This was taken by a client with me last year, long head, you would judge maybe gold............silver. It didn't make it on the weight. Still a beautiful head though.
Hope this has helped.
Regards
Malc