Researcher;
Thanks for the input, yes I was aware that the various length shells were offered as an option during that time frame. Primarily for that reason I have always suspect this Lefever was ordered with the long chambers when bought new. As the 3" shells in 16 were never truly a "Standard" it seems unlikely it would have been rechambered for this length. Also it has a standard cone, not an extended one as if someone had lengthened the cones & lengthened the chambers in the same process.
At the time the gentleman brought in that 3" Remington SP 16ga hull I wrote to the NRA about it. They had no knowledge of its existence but also highly suspected it was experimental.
I can definitely attest to the fact that at least one existed. It appeared to have been rather recently fired when the man found it, markings on the hull were very distinct & it was obviously longer than the 2 3/4" standard. The only part I am in question on is the exact dates & the Dram Equivalent marking. As I think back though it had to be between around 1974 & 1976. I distinctly remember the 1˝oz of #7˝ shot. The DE was either 3 or 3Ľ but I am remembering just 3. I remember at the time it fell into what would be basically considered a "Low Velocity" load.
