Bruce,

I think Roster solved the problem for modern high carbon steel barrels.

For older, low carbon and composite barrels Modified Choke is a misnomer. The barrel thickness and choke constriction are key factors.

MOST shooters do not have access to an accurate dial indicator or digital bore gauge and certainly do not have a barrel thickness gauge! We cannot say that steel is okay in a modified choke. That may result in a blown barrel like the .008" failure which you witnessed!

We will test and retest to prove or disprove the hypotheses.

Mark

So are Rem Parkers made with Remington Cro-Moly barrels modern high carbon steel barrels? It is my belief that rem used the same barrel steel for many years, possibly until present. They have gotten thicker for sure, the newer 870's are like galvanized water pipe.

The only Parker I have shot steel in is a Bernard with .006 constriction both barrels and OMG .045 average wall thickness. The unstruck wt (30", No. 2, 12ga) is 6/0lbs. That gun is immensely strong. My thinest gun is a 12 once honed with .028 remaining and I can't say I like anything below .030. Even my 20's are right at 30 and 20s are notorious for being thin. People talk about light guns like they are wonderful but I don't know about lightness if that weight came out of the barrels.

Bruce,

I do not think the high carbon steel used in gun barrels today existed in the 1930's.

Mark