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The Trijicon 4x32 BAC ACOG Rifle Scope could be used for that rifle and ammo, however, the BDC reticle holdovers will not be as accurate since they are designed for 300BLK. These models will be closer than the 5.56 or .308 reticles though.
Yes, the Trijicon 4x32 BAC ACOG Rifle Scope will work for your 10" 300 Blackout rifle. This reticle was specifically optimized for 300 Blackout with a 16" barrel. Since you have a 10" barrel, the holdovers will not translate perfectly.
The Trijicon 4x32 BAC ACOG Rifle Scope BDC reticle is essentially designed based on the average performance of different types of commonly used ammunition. The BDC reticle will still be fine with subsonic ammo or shooting with a suppressor. This is what the manufacturer says in regards to the BDC reticle and different ammo. "The supersonic BDC (out to 600 yds.) has been merged with the subsonic BDC (out to 200 yds.) to provide one set of aiming points for both types of ammunition. The reticle drops are based on an average of commonly available off-the-shelf subsonic and supersonic ammunition from a 16" barrel. This BDC reticle is not limited to one or two specific bullets: a majority of commonly available ammunition will fall within the 2 MOA diamond aiming points."
You can use the Trijicon 4x32 Scopecoat linked below.
https://www.opticsplanet.com/trijicon-ta64-4x32-acog-scopecoat-nsn-models.html
Trijicon makes quality optics and will do just fine.
The BDC gives information for sub-sonic drops on the left and super sonic on the right.