Subsonic 6.5 creedmoor

Anybody tried loading any for varmit control around the house . I have seen where people have loaded 156 gr flat base type bullets with pistol powders and magnum primers to achieve a pretty accurate 100 yard groups . Anybody tried it ? Thoughts ?
Two things I don’t want is a bullet hung in the barrel or an inaccurate round. I’d say 3-3.5 moa @100 would be accurate for a sub round .

I've only loaded subsonic ammo for my 308. About 9 gr Trail boss powder with 175 gr bullets gets about 1050 FPS.

Mixed some 308 down to 1200 fps ,walked up on a huge buck eating in a green field a started grinning , until I shot and realized I had gotten them mixed up with my good loads