Catalog #15 covers 1905~1906 and the standard 26" barreled 30-30 retailed @ $21.50 and listed at 8lbs, the extra barrel length was $1 per inch up to 30", so an extra $4.00 (18%). The extra length being listed per inch would suggest you could also order 27" and 29". The same barrel length options were available for the Model 1903 pump but it had a 24" barrel standard so a 30" for it would be $6.00 extra, they retailed at $12.00 so that would be a price increase of 50%.
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The telegraph codes for ordering these were complete words with the octagon barrels starting with 'B', the 1899 'B' in 30-30 would use the code "Beach", 38-55 = "Bite", 32-40 = "Bold", 25-35 = "Bulk" and 303 = "Bait".

The catalog pictures still show an 1895.
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Gene