The best place to get detailed information about the March reticles is at the March website. Here is a link to the exact page.
MARCH Scopes Official Site
marchscopes.com
Click on the MTR-1 or MTR-3 and make sure you scroll down a bit to get the table.
Now for a bit of information. There are essentially two types of March-X 8-80X56 (it's also the same for the 10-60X56 and the 5-50X56):
One type has the wire reticles such as the FCH, the Dot and the Diplex.
The other type has etched reticles, essentially al the MTR reticles, MTR-1 to MTR-5 and the MTR-FT.
I bought my first March scope, 8+ years ago, a March-X 5-50X56 with the MTR-2 reticle. A few years back, I sent it to March to have them replace the MTR-2 with an MTR-5 reticle as my then 65 year old eyes could no longer see the fine reticle. When it came back with the MTR-5, it was perfect for my eyes and I've been happy with it. I later got a March-X 10-60X56 and made sure it came with the MTR-5 reticle. These scopes last a very long time.
If you get a wired reticle, you cannot get it changed for an etched reticle and the other way around.
The dot comes in 1/8, 3/32, 1/16 MOA. I seem to remember that the 3/32 size is quite popular in the old geezerhood.
EDIT: I found this page with the Dot details:
I have no clue what UBR targets look like but do remember that the 8-80X56 is a second focal plane scope so as you increase the magnification, you reduce the apparent size of the reticle on the target. The MTR-1 is .08 MOA thick at 10X, at 40X it will be .02 MOA thick and at 80X it will be .01 MOA thick. At 100 yards, that subtends about 3/32" at 10X, under 1/32" at 40X and about 1/64" at 80X. Double those sizes for 200 yards, triple them for 300 yards. For meter distances, add a smidgen more.
I do recommend you check my math; it is Monday morning.