A bit odd I went from 243 to 300BLK for fallow. I was finding that the 243 would do a huge amount of meat damage. (Howa Ranch 243 with a 20" barrel suppressed, and federal 80 grain). I did headshot one fallow at 250m, and heartshot one at 335m.
I went to a Ruger 300BLK American using 125 grain. What I found was the 300BLK had bigger wound channels but less overall meat damage. Have since sold the 243.
Using a scope with drop marks (Nikon BDC) I have worked out the different range drops. I write them on my arm before heading off hunting. You can also do some basic range finding using the reticle subtensions (for example if the deer is the the 3rd hash down in height then it is ~ 200m), which is the 2nd circle down for zero.
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