The guns that Parker Brothers or Remington advertised as "Long Range" guns with 3" chambers were not similar or identical to earlier 3" chamber 12 gauge guns. The thirties vintage 3" guns were lightly constructed #1 1/2 frame guns. Many, well, maybe not many, earlier guns chambered for 3" shells were built on many different frames, #2, #3, and a very few eight gauge rebarrels on #6 frames. However, they were built earlier than the Remington advertised "Long Range" guns on # 1 1/2 frames. As earlier posted, it is assumed that the Remington era "Long Range" guns were straight tapered from the breech, but an actual wall thickness measurement would confirm that assumption. I have yet to hear from someone who has made and posted those measurements.
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