There are a number of side bys ides with round underbolts instead of the usual Purdey underbolt. From my research the round bolted SXS include Winchester Mod 21, Horsley, Ithaca Flues and a few others.

Are there any others?

Those of you who have round bolted SXS's- how have they held up? Have you had any problsme with the barrels coming off face or the gun shooting prematurelly or repeatedly loose?