What features are you after in a pack?
Myself...
-Some kind of scabbard system that you can lash down around the rifle like a Triad Cover that wraps around the rifle and buttstock and is detachable from the outside of the pack with clips or something. Make it an add on option so guys can use it if they want and if not they can keep the cost of the overall pack down.Maybe make it so it could work for a rifle, or a tripod, that way if you are shooting a Competition Dynamics match and expect to need a tripod you can lash the tripod to the pack and sling the rifle.
-Contoured and padded straps like a TAD Gear pack
-Another add on option, but some kind of molle battle belt for mags and accessories and distributing weight if you have heavy gear in the pack, but with some kind of quick detach option so you could get to a stage, or a hunting spot, or after hiking to a shooting spot, reach back and unclip the belt from the pack and you can dump the pack while retaining the belt, mags, etc.
-One large inner compartment that clamshells open so you can get to everything without having to unload it all to reach whats at the bottom
-Multiple smaller outer pockets of varying sizes for things like a TAB Silent Ammo Carrier, magazines, shooting glasses, maybe some kind of clip or strap for hearing protection
Keep the overall size down, enough to stuff a jacket in it if things are expected to warm up or cool off, room for ammo, range finder, etc, but it doesn't need to be super huge like a three day pack that people want to stuff all kinds of crap into. Go for a purpose built, competition pack with room for gear common to tactical rifle competitions and not much else. Everything you need, nothing you don't.