Target gun barrels and bore size

[Ray Masciarella]

I believe that over boring to .740-.750 would make a difference. The modern guns that are backbored and overbored, ie Browning (backbored to .742) and Mossberg (overbored to .759), definitely pattern better in my opinion.

I can't see how .734 would make much difference so it may not have been done for any specific purpose.

[Twice Shooter]

I have an under lever 2 frame with .765 bores that deliver beautiful patterns. It's great for long range shots when I do my part. Years ago I had a Stan Baker Perazzi single barrel with an .800 bore I shot trap with.
Cheers, Tom