I feel like you can approach that with the 130gr class of bullets in a 16" which would put you on par with the 115 in terms of BC. Interesting thought experiment. I feel like sierra is lying about the bc of the 105 blitzkings though. They were bucking wind way better and dropping far less than they should.
When the barrel goes sub 20" I kinda don't understand the arc at all vs grendel honestly. Grendel just makes more sense to me. Is the arc easier to load/more forgiving than grendel? I mean grendel is pretty easy. Shove enough lever in the case until you feel uncomfortable then send it with a projectile of your choice. Shoot sub moa all day. (Generalizing but you know it's about 90% accurate)
When the barrel goes sub 20" I kinda don't understand the arc at all vs grendel honestly. Grendel just makes more sense to me. Is the arc easier to load/more forgiving than grendel? I mean grendel is pretty easy. Shove enough lever in the case until you feel uncomfortable then send it with a projectile of your choice. Shoot sub moa all day. (Generalizing but you know it's about 90% accurate)