Now... if someone would come out with a lever action carbine in this caliber...
Now that's the sort of holy grail, or major market blind spot, of this relatively new caliber. Besides the bad economic timing of its initial release, the .327 was pitched as a self-defense caliber and with a few exceptions, a lot of the early guns had short barrels.
The economic lesson seemed to be that if you are going to successfully introduce a new cartridge, you need to get a lot of people using it. You need (1) a more comprehensive and more aggressive marketing campaign and (2) a wider variety of guns for it introduced simultaneously. A common theme in some reviews or discussions is that the .327 had a lot of untapped potential for hunting, woodland use, kit guns, etc... Here, we were lucky that the small but passionate core of hopeful users, as evidenced in our
club thread, helped keep it alive enough for Ruger to see the value in introducing new guns like this one. I remember reading comments like "they are finally finding the niche for this caliber" when they recently released the Single Seven.
So keep the demand fires burning. Buy one of these sweet new 4" SP101s. Buy some factory ammo. Take it to the range and shoot it with friends. I'm sure it wouldn't hurt to share that demand with your favorite manufacturer of lever guns by phone or email. The reason we haven't seen this in a lever gun is that no manufacturer has seen justification for the design, time, and tooling expenses.