ATA rules in the early days allowed 1 1/4 ounces of shot. I don't know when that changed to 1 1/8 ounces, but a 1917 Parker single obviously digested thousands of rounds of 1 1/4 ounce loads without significant damage. My 1922 PHE trap gun was used on pigeons until I purchased it. It had probably shot almost nothing other than 1 1/4 ounce loads for its entire life until the 1990s when I purchased it. It is still very tight and on face. By the way, the earliest NSSA rule books allowed 1 1/4 ounce loads for skeet competition. Fortunately, that didn't last long.
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