I sure wish the March had a smaller center dot on the reticle like the ZCO. Would definitely be better for the times I used it in F-Class shooting.
The MPCT3X reticle has that dot in the middle that is 0.036MIL. Ok, let's look at the reticles that are available in the March scopes I listed above. In the March-FX 5-42X56, the one with the large adjustment range and the ultra-wide eyepiece, that make you think you're viewing the target in IMAX due to the huge FOV, the TR1 reticle has a dot in the center that is 0.06MIL. The March-FX 5-40X56, the one that compares more equally with the ZCO for FOV and adjustment range but is $1,000 less, can be had with the PDKI reticle. This reticle has a center dot that is .075MIL. (I'm very familiar with the reticle since I was one of its designers; I'm the D in "pDKi".)
So, the sizes are as follows:
MPCT3X: .036MIL or .125 MOA dot.
TR1: .060MIL or .200 MOA dot.
PDKI: .075MIL or .260 MOA dot.
We know what the size of the rings are on F-class target, the X-ring is 0.5MOA. So any of those reticles will allow you to hold anywhere inside the X-ring.
I've shot a bit of PRS, but a whole lot of F-Class. What I find interesting when discussing riflescopes is how people talk about them looking at the target in superb conditions. Unfortunately, the conditions rarely stay superb where I shoot most of the time; South Texas. We have something called "conditions" which refers to mirage.
This phenomenon has as its mission to screw up your sight picture. The scope which presented a super clear and crisp picture of the target early in the morning, is now showing a blackish amoeba. You can't even identify the target itself, let alone the rings and the X-ring is simply not there. So, you back off on the magnification until the amoeba settles down and at that point, surgical placement of the shot is more like crap shoot.
When I upgrade from Nightforce to March-X 5-50X56, I slowly realized that I was able to stay at 40X (my then favorite magnification), regardless of mirage conditions. When people around me were backing off into the low 30s or 20sX, I stayed at 40X. A few years ago, I discussed this observation here in a thread, in which I hypothesized that mirage was degrading the IQ produced by ED glass less quickly and severely compared to non-ED glass. A that time, I upgraded from the March-X 5-50X56 HM to the March-X 10-60X56HM, the one with Super ED glass. I had compared the two side by side and I could actually see the difference the Super ED glass was capable of producing. On the range, I found that I could go to 50X and stay there regardless of conditions. In fact, my riflescope has been a 50X only for the last 2 years.
The March-FX 5-40X56 has ED glass, the same as in my March-X 5-50X56 that I always ran at 40X.
The March-FX 5-42X56 has the High Master lens system that uses Super ED glass elements. The same as in my March-X 10-60X56 HM. The doublet lenses at the front that compose the objective lens group are Super ED glass, which is very close to pure fluorite crystal without the latter's inherent fragility and issues with changing temperatures.
March scopes were the first ones to incorporate ED glass, starting 14 years ago. March scopes are the first and still the only ones that have Super ED glass, in a few select models. The 5-42X56 HM is one of those. The others are the March-FX 4.5-28X52, the two Genesis models, and the March-X 10-60X56 HM, the one that I run at 50X regardless of mirage conditions.
Before everyone goes all nuts, when the mirage is running, the IQ is degraded but the target is still round, I still see the rings and the X-ring, but the image is fuzzy; it's actually quite impressive to see. I can still observe the mirage and that's important. When I look at the target line with a 5-42X56, I am in awe of the field of view its eyepiece produces, but I want 50X.
Anyway, good luck with your decision and I hope it works out well for you.