Small bore, now maybe you Brits just didn't think your 25" would sell very well here in the states, and you kept 'em all - but the ratio of 30" to 25" barreled guns is what.... 20:1 - most likely even higher than that. I'd bet 30:1 in favor of 30" barrels over 25"s
So, someone in merry ol' England didn't shoot XXVs hmmmm?