On my office bulletin board I have two targets, one fired from 100 yards with a 308, the other with a 22-250.
The 308 group was prone with bipod, 5 rounds into 0.339".
The 22-250 group was 10 rounds into 0.249".
These groups were fired from a Harris "S" model bipod, so I suppose there's evidence of repeatability.
Bipods in the hands of a competent shooter are very repeatable and I would recommend one to any shooter looking for a good field rest.
There is technique involved, and every rifle tends to respond in a different manner, although my two rifles were heavy varmint, and sporter weight.