I belong to two large action pistol clubs and shoot pretty much every weekend year around in IDPA, and Steel Challenge matches, with a falling plate or USPSA match thrown in every now and then. In the years since the introduction of the "Gap", I have picked up exactly one Gap case while scrounging brass. That says a lot about how many are in the hands of shooters. I wonder if the Gap will even be around in 10yrs. Currently brass is available, but if there is not much demand that will soon change. I reload, so I could trim down acp cases to use in the Gap, but wouldn't bother as there is no advantage to the cartridge over the acp. I'd prefer the .357 Sig over the Gap. If you decide to sell the gun, at least there might be factory ammo available for it. Or you could buy a .40 conversion barrel and have tons of ammo options.
Savage