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Was there a standard chamber length ie. LC Smith, or were they varied, ie. Parker?

I can't speak for the other makers, but LC 12 gauge chambers were bored 2 3/4" standard; if they were other than 2 3/4", there would be an oval stamp on the barrel flats stating "Chambers 2 5/8 Inches" or "Chambers 3 Inches", etc. As I recall, prior to chamber length standardization on late vintage LC's, twenty gauge chambers were bored standard at 2 1/2" and sixteen's at 2 9/16". I've seen some early small bore LC's with odd chamber stamps; an A-3 twenty with chambers marked 2 3/4" and a 16 gauge Specialty (I believe) stamped "Chambers 3 Inches". It's still a good rule of thumb to always measure chamber length on any vintage gun to be certain.

But I think the question was

Did Baker have a std

I think at that time 2 5/8 was the American norm

Daryl?

Lengths of chambers varied

Thank you, DH

i have a set of baker bbls and are 2.5 inch chambers.have no idea when they were mfg.

I would think the majority of Baker 12ga would be either 2 5/8" or 2 3/4". Other lengths could likely have been had on order as for most American makes of guns, but these were the "Standards".
I cannot recall having ever seen an American made 12 gauge with 2�" chambers. According to Greener even British so called 2�" guns had chambers which actually measured from 2 9/16" to 2 5/8". My Birmingham proofed J P Clabrough measures 2 5/8".
Most early American doubles in 16 gauge had 2 9/16" chambers with 20's having 2�" but for 12's it was generally 2 5/8" with several makers going to 2 3/4" early on.

2-Piper, I just measured a few Bakers in 12 ga. with a Brownell's chamber gauge, machined to .796" diameter at the end. I found that most of the trap guns, circa 1909-1919 measure 2 1/2", but one measured 3". Measuring A and B grades and Paragons, most are 2 3/4" chambers. No one knows which chambers could have been altered. I am puzzled that the later trap guns would show short chambers.

Daryl;
I find that surprising as well. I would have suspect that most trap guns of that era were intended for 2 3/4" shells. Even if they were "Short Chambered" for the shell as some trap shooters seemed to prefer I would have expected them to have 2 5/8" chambers for the 2 3/4" shells. I would however have also expected that a gage of .796" would go full depth of most chambers & not give a short reading as sometimes occurs if the gage is made up to present minimum of .798".