Please may I ask for some advise:
I want to do some target practice from different unsupported positions at, typically, 25-50 Meters. My objective is getting familiar with a new rifle and ching-sling (so the amo is not for hunting use) and keeping the noise down while practicing! Accuracy is not what I am after, just creating 'muscle memory' for unsupported standing or kneeling shots.
Is this type of factory amo generally available, what is the typical cost, and are there any issues (safety?) when using sub-sonic amo in a rifle with a twist and moderator designed for standard amo?