As far as other prospective bullets. A 165 ish grn pointy .358 bullet for the mgp, yeti, and I think 2 other wildcats for ar15 would probably go over well as the 180s are the nice zippy bullets but there's only 1 or 2 to choose from -anything lighter is a pistol bullet that is going way faster than its designed for and is no good for hunting . The 180s are almost at mag length so the 200s and 225s have marked fps decrease as it heavier and all the extra bullet is eating powder space.
Personally I'd love a 220ish pointy copper bullet for the .452 velociraptor. Barnes 460 s&w bullets are 200 and 275grn one a bit to heavy eats up powder space other loses energy to fast with low bc. Your cavity back at 220 would prob be a really decent bc for a big bore. Most of the FTX are the only other ok bc 452 bullets are probably going to fast at close in ranges. I realize both calibers are smaller market but there's definite holes in the useable bullets available
I don't have time to try out these new 6.8 bullets this deer season but I'm looking forward to crop permit does in the spring, I'm thinkin that 120 is made for the 12.5" arp barrel