I read this whole thread and learned nothing about either of the 2 scopes. Just that Lowlight doesn't like Shiraz.
And that March is just as bad as IOR? That seems like a low blow considering March has a good reputation for tracking accurately?
I was refraining from commenting because this whole thread was cringe.
At risk of being called a fan boy for saying something positive about March, I have a 5-40x56 and I like it, a lot. I also own 2x gen 2 razors, Nightforce NXS, A couple Leupold VX7/VX7L's, a couple Swarovski Z5's, Gen I PST, a Razor LH HD, a Sig whiskey 3 and even a redfield. Throw in a few red dots and open sights and that about sums up my collection. I want to add an S&B to the collection as well but they don't offer one in the configuration I'm looking for. I'm not a brand loyalist.
When I bought my March, I was using the NXS primarily, and had thousands of rounds behind it. My first range session behind the March left me feeling like it was in a whole other level compared to the NXS. I went on a (different) forum and said how it made the NXS feel cheap by comparison, and got utterly roasted for saying so. I had them both at the range that day and was comparing them side by side. Not allowed to talk ill of NF, I was told I was wrong by people who had never even seen a March in person. Apparently it was inconceivable for a $3600 March to be better than a $2250 Nightforce in any way. Hey, opinions right... (I still stand by mine)
I haven't spent time behind the new NF offerings, but a mate of mine has S&B PMII and a NF ATACR, and he rates the ATACR higher. If I was looking for another 'big' scope, I would buy the ATACR next, because I like a bit of diversity. That's not an endorsement to say it's the better out of the 2 OP is asking about. I just feel I'd be missing out if I didn't try others. Like when I swore I'd never own a Vortex scope after spending time behind a mates Gen I PST, now I own more of them than any other brand.
Lowlight made a few comments that I
think are outdated and incorrect. I bought my March quite a few years ago (2012). It is 1/6400 mils. The fact that it was 1/6400 wasn't a great secret that was exposed by some reviews, this was one of the first things I was told by the distributor when I was still considering the March, prior to purchasing. I'll admit, it wasn't advertised on their website, maybe it should have been? I believe they changed over to 1/6283 mils in the next release after the one I bought. So I think they've been using 1/6283 for at least 2 or 3 years now, possibly more.
Hairy Biker said all 5-40's were 1/6283. That's incorrect. There were 5-40's (including mine) that were 1/6400.
The comments about the Aus SF using March - I can't remember if I heard it directly from the AU distributor when I bought mine, or if I heard it second hand via a friend when he bought his a year or so after me, but that was going back a few years now. I thought I heard an order was placed for a few units? Don't remember, don't care, it was also well prior to the ATACR line of scopes being released.
Wish I could offer more advice to OP based on my experience, but I've never been behind an atacr so I can't tell you which one I prefer. I can tell you the 5-40 is a
lot of magnification, more than I need, anyway.
My next scope is probably going to be a 3-24x52 March, not because I'm sold on the scope and love March so much that I want to marry it, but because I can't find anything else with the same features and quality of glass (FFP, mil/mil, 3x min zoom, min 15x max zoom, 30mm tube, zerostop) and I'd also happily own another March.