Holmes has an 8" '58 Remmy
There's a lot of gunplay with 3 different guns in that scene of "The Adventure of the Solitary Cyclist", so it's easy to get the guns mixed up.
Carruthers shoots the pretend groom Woodley with a Webley, the Reverend Williamson grabs the Remington he had concealed in his Bible during the mock wedding, but Holmes disarms Williamson with his own Webley and then points it at Carruthers.
Damn, that was hard enough to write out even after watching it on YouTube.
No wonder you remembered Holmes with the Remington.