3 inch chambered 12 gauge

[J.B. Books]

Originally Posted by Dave Noreen

The 1937 Remington era catalogue adds -- "Ordinarily Parker 12 gauge guns are chambered for shells up to and including 2 3/4 inches. These guns can be furnished with special long range choke boring to give more effective results at extreme ranges. 12 gauge double barrel guns, with the exception of the "Trojan" are also available with 3 inch chambers for use with maximum long range heavy loaded shells. So chambered, Parker guns are guaranteed to handle these shells properly."

"Parker 10 gauge guns are regularly chambered for 2 7/8 inch loads, but are also available with 3 1/2 inch chambers for use with maximum loads. No extra charge for a Parker Long Range Gun. Guns should never be used with shells longer than those for which they are chambered. See table of complete specifications on page 34."

So in 1937 Parker said not to use 2 3/4" shells in 2 5/8" chambers............