I have two 20 gauge Ithaca Flues guns that I bought for parts. Both have split barrels out at the forend region. What ClapoerZapper says about the barrels being struck very thin is absolutely correct. Knowing that, I stay with low pressure loads in my two intact 20 ga. Flues guns.
That said, one buddy's younger brother used to shoot 3" magnum loads in his Dad's 20 ga. Flues without blowing up the gun. I thought that was crazy when we were in high school. But I consider him very lucky knowing what I know now.
