Have you noticed that very few English boxlocks exceed 28 in length? Certainly some older BP proofed examples were 30, but generally speaking, 28 is the maximum standard length. This observation tends to hold across all gauges.
I have been reflecting on the paucity of long barreled boxlocks for several years without reaching any conclusions. Recently, however, I was examining my 12 alongside my 20 (both 28 lightweights) and realized that the balance point on both examples was 3/4 ahead of the hinge pin. These 28 inchers are decidedly barrel heavy which promote a natural forward allowance and follow through in a hunting context. I am not confident that 29 or 30 barrels would improve the dynamics of those offered by the 28s. My sidelocks in lightweight configurations seem to require 29 or 30 to achieve a similar dynamic feel and and tend to be several ounces heavier as compared to the comparable 28 boxlock. I am beginning to believe that the answer to the question originally posed is that makers were fond of the 28 length because they could achieve a satisfactory balance and feel for those desiring a barrel heavy hunting implement at the 28 length and decided that further length was unnecessary.
Do others feel similarly regarding the 28 boxlock? I would love to hear from anyone who owns and utilizes both 28 and longer barreled boxlocks and can speak to the relative perceived dynamics of the various barrel lengths.
