Haven't run both packs, more interested in field shooting than PRS, so take that into account:
I think the original 22 Mag, at about 1600 CI / 26L for the main bag, plus 1400 CI / 22L for the side pockets, is about the right size for field events - it's big enough to fit one front and one rear bag, ammo, small tool kit, cold weather gear, ear muffs, and some food. Has a water bladder holder and port. Also has enough room that you can stow a bino chest harness, as well as outer belt with field shooting gear (trauma kit, mag holder, dump pouch, etc) inside so everything is in one place.
The open sleeves on the side can fit a tripod in one side, and wet weather gear and rifle rain cover in the other. Shooting mat, if you want one for really wet and/or muddy conditions, can stow underneath.
As others have mentioned, the pockets give a lot of options - small belt pocket for small things you need frequent and fast access to, such as lip balm, sunscreen. A medium belt pouch fits a beanie/wool hat and sunglasses, for example.
The PALS webbing on the back can be used to mount some tripod straps, or run some other pockets - a large for cold weather gear, and their Organiser Pocket can carry all of your admin gear.
There's already three internal pockets, making it easy to group similar items (such as cleaning, field gear, ammo & mags), as well as a top pocket.
All up, it's a pretty good layout.
My only gripe is that, once the side sleeves are stuffed full, getting access to the internal side mesh pockets is tricky. Similarly, when the whole bag is full, access to the side sleeves can be a squeeze.
The 2nd gen 22 Mag doesn't have full-length side pockets, just stretchy water bottle pockets. This is possibly a better option for tripod carry, but takes away the ability to use a sleeve for wet-weather gear.
For this reason, the
357 Mag *might* be a better choice - it's pretty much the same-sized main bag, but on an internal frame, so lighter overall. The side pockets are zippered, not open - meaning less crud / rain can enter. Still large enough to run a tripod up and poke out the top. And the internal pockets are better located on the front flap panel.
However, this then makes for a slightly larger overall package, at 3400 CI / 54.75 L for the 357 Mag vs 3000 CI / 48 L for the 22 Mag ... still fairly small as far as hiking/hunting packs go, but larger than most would carry for a day hike ...
And likely bigger than many would need for PRS, given the short gear lists in the
PRS loadouts? What you got thread.
However, if you think of what you'd usually take on a self-sustained day hike and add field comp shooting gear ... the 357 Mag might be just about perfect.