All I know is the two 270’s I’ve been around with suppressors on them weren’t really that quiet. One of the guys even changed to a different suppressor but it didn’t help.
I suspect that has to do with the particular suppressors, rather than a suppressor on a 270 per se. I've been around a suppressed rifle in a large 30 cal burning about 100 grains of powder and it was impressively quiet.
No suppressor can quiet the supersonic crack of the projectile traveling downrange.
