They may not be so plentiful these days, but back in Edwardian Britain there were quite a few .25 calibre air rifles around, such as Gems, Millitas, Bugelspanners and Musketeers. When BSA got firmly established, taking the Lincoln Jeffries patented design to the next level, the company eventually released their Improved Model D in the big No.3 Bore, or .250” calibre.
There was a short version, but the increased powerplant of the longer 45” action compensated for the heavier pellet. Today, .25 springer owners look for a selection of mid to lighter weight pellets to maximise performance.
But in 1908? BSA decided quickly to ditch the calibre, concentrating on the .22 in this longer action. This was less to do with the heavier calibre and more to do with marketing,…