WM Caribou MF comfort range

I have a Caribou MF. I agree with its 35 degree lower rating. Sleeping in mid-weight wool socks, nylon hiking pants, lightweight Smartwool long sleeve top and light hat, I was good with the hood pulled up and tightened around me to 35 degrees F. I started to wake up from the cold below that. I could have added more clothing, but it was close to morning so I just endured the periodic awakening.

The upper temp ranges you outlined seem about right, but I usually don't monitor temps at that level. Wind/breezes/circulation around you (i.e. open tarp vs tarptent vs double wall tent) would affect the comfort some.

For sure. Everyone has their own comfort level as well. I just want to get a feel for the bags versatilty.

What kind of padding were you using in that situation?

I just got a Caribou in May so I didn't have the chance to test out the lower reaches of the temperature range. But I did get to use it several nights as a quilt with temps in the 50s. Two nights were spent under my tarp in my Vapr bivy and one night was in a lean-to (no bivy). Was comfortable each night with a silk baselayer and using a Montbell 120 pad on top of a 1/4" thinlight pad.

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The rating is very accurate. Great bag.

In my usage, I was in a SMD Lunar Duo tent with a Neoair regular pad under me. I don't fault the bag for "bottoming" at 35 degrees since that is the stated rating.

Does anyone have any idea what the EN rating for the Caribou would be?

I think your estimates are very reasonable. It is a very versatile bag for three seasons. I have used mine comfortably down to freezing and use it in summer as a quilt or with feet vented(like I did last night) in the hot, humid southeast. I see no need for anything else until the temp drops below freezing.