Jerry, many of us shoot low pressure nitro loads in our composite steel barrels. I have a 1886 O grade top lever hammer gun that I shoot hundreds of 7/8 oz. loads. You should read the Sherman Bell articles in the Double Gun Journal. Unsafe guns where tested with proof loads and lots of myths where addressed. If interested I'll get you the journal numbers, there good reading.
The gun to the left is a 1890 NH 10 ga. with Twist barrels that I hand load Bismuth and Nice Shot in the 2 7/8" ten, great fun.
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