Unfortunately, Mr. O'Heir is in the habit of stating his assumptions as facts without researching current information on the subject.
The 15-year shelf life sure sounds like dinol. It attracts moisture, and even the best sealants have finite water vapor transmission rates. Storing them in freezer bags with a large enough quantity of desiccant to capture any moisture that permeates the bag until you are ready to use them may help. You just don't want to store loaded ammo in a desiccant. Norma points out that water molecules are small enough to get past bullets and primers and over about a year, a loaded cartridge equalizes with the RH of the air around it. In the case of desiccated air, it can be dry enough that it raises the powder burn rate as much as 12% (depending what RH storage you started with—12% is going from 80% RH conditions to near 0% RH).
Here's
a little more recent study (Oct 2014; click on the upper right dark blue box to download the PDF file). It's the one I actually had in mind when I linked to the other. When you get to page nine, the 80 ms (several times your gun's lock time) delays are pretty dismaying. A shooter with any sort of imperfect follow-through would get group spread from that. It's not even good enough for service rifle match shooting, much less benchrest. Many shooters won't notice it clearly, but a muzzle can move a lot in that much time. A little like learning to shoot a flintlock, it might actually help learn better technique, but people need to be aware they are doing that.
Bismuth oxide is not the sensitizer in Catalyst primers. Nitrocellulose is, made impact-sensitive by the addition of aluminum. (Actually, nitrocellulose is always somewhat impact-sensitive, as is any high explosive, but not enough to make it dangerous to use in propellants.) The bismuth trioxide adds some oxygen to the reaction when it gets hot, and recombines with it while it streaks out into the powder. If you look at the
Federal image here, you'll notice a lot of fireball coming out of the Catalyst primer. That makes me think the issue with general availability might be that load manual data would need to be redeveloped with these primers to avoid excessive pressure from faster ignition, but I want to be careful to say I don't know that is a fact; it is speculation. That impression is reinforced by their claim powders burn more cleanly with Catalyst primers. Clean burning is associated generally with higher pressures and temperature or a less negative oxygen balance than powders normally have. If the latter is being achieved because the Catalyst contributes a little excess oxygen to the powder burn, then you can expect that would increase pressure by speeding up initial ignition a bit.