The DMR Pro is better glass than the DMR II, and I might say I wish my DMR II was a DMR II-i so I could use it for night matches too, instead of swapping scopes for illuminated reticles. I'm very happy with my DMR II though, it's very clear out to 1400, and I pick up mirage a lot of other guys can't see. I don't feel disadvantaged at all using it - but if I were buying again, I'd spend a little more and get a Pro or at least the DMR II-i.
The Horus reticle might be a little busy for the game. Like we've said already - you're going to dial most of your shooting, so you won't be playing around down in the matrix anyway. The G3 Christmas tree is a nice compromise, it's there if you need it, but you don't notice it much if you don't. If your club has a huge infrastructure to afford movers and has a lot of wind, MAYBE I'd justify a Horus, but that's usually the exception, not the rule, and the ones I have seen have been really generous, since most guys don't shoot them too often. MD's aren't out to screw guys with super difficult objectives, they're trying to make a competitive match which doesn't offer any
How many rounds are you shooting in an average PRS match?
You can usually count on about 70-120 per day.
A bit more expansion on Match Day expectations: Plan for 7-12 stages, running 60-120 rounds. Most club matches I've been to are 8-10 stages at 70-90 rounds.
Stages are limited to 90 or 120 seconds, which means the average shooter can only get 8-10 rounds downrange from 3-5 positions. Targets will generally be 2-4 MOA, but you'll usually see at least one half moa target and usually some really big targets too at any given match. You'll usually see one or two stages per match where they'll push the pace by forcing a lot of positions, or force a mag change, or force port loading, etc. - stuff to keep it interesting, but not overwhelm the match with too many stages which might give some shooters an advantage, or disadvantage. Squads are usually 5-8 guys. With less than 5, guys get rushed because you need a spotter, shooter, and scorer up and going, while a 4th is getting ready. Guys need time to prep their range card, load mags, record dope, get a drink, etc. Then it's nice to have an extra spotter and a guy shagging brass. With more than 8, you have guys standing around too much waiting on the rest of their squad to finish. So say there are 50 shooters, break that into groups of 7-8 guys, that's 7 squads, which means at least 7 stages, and better 8-9 stages to let all squads be shooting without log jamming. If you run the math - 8 guys x 2 min per stage + 1min between shooters = 24min active shooting on stage = ~4hrs on stage, plus a few min walking between stages, RO/Squad Mom reading each stage briefing, safety briefing in the morning, lunch, any delays, awards after... Try to fit in 14 stages, then you're talking about ~7hrs on stages, plus all of the administrative stuff - makes for a REALLY long day. Alternatively, if you only draw 30 shooters and run 4 stages, guys will only shoot 30 or so shots, get done too quickly, and be left wanting for more. REALLY well ran matches with good squad moms/RO's can clip off 14 in a day and not feel rushed, but that's usually an accident.
Most matches have accommodations to zero the day before during check in, but usually don’t allow zeroing the day of. No sighters, all shots are on the clock for score. Some matches may have a cold bore validation at check in to be sure new shooters are good to go before they send them out onto the range, reducing the risk of newbies sending rounds over the berm.
Another tip I'd offer - a big mistake I made at my first matches - carry what you need on hand, but don't get a bag too big. Something the size of an Eberlestock Lo Drag II is about perfect (or Hi Speed II - same pack without the scabbard). You can carry what you need without breaking your back with stuff you might need, but could have left in the truck. I've had a rod in my truck at every match - it has been used at every match, never by me. I'm tempted to stick a 3 piece rod on my tripod from now on instead, so I don't have to run to the truck to help guys out. First aid kit as well (bandaids, gauze, bandage tape, alcohol and iodine wipes, rubber gloves) in my pack has been used at about half of matches, and SUNSCREEN. Something to cover your rifle & spotter from the sun, and rain gear. For shooting bags, get the Armageddon Gear Game Changer or Wiebad Fortune Cookie. Take your pick on whether you want a Pint Sized or Mini, or the full size versions. I use the full sized Fortune Cookie, but it's the biggest and heaviest of these - nice for filling in tank traps and odd barricades, not nice for carrying.