I thought about posting this in the ammo/reloading section, but I know I would get more help here. First let me say that I know it would be probably better to have a .22 and a suppressor for it for the ultimate quiet. However, I currently have neither....YET! So I am trying to get a good .223 subsonic load together. I have been researching and have found alot of guys say to use the heaviest bullet your gun can handle to have the hardest punch. So my gun really likes the sierra 69r hpbt. I loaded up a few loads with them and nothing but keyholing at 100yd. Also I don't think any of them were truly subsonic.
First load.
69gr hpbt
5gr trailboss
Second load
69gr hpbt
4.5 gr trailboss
Since both loads were not subsonic and still keyholed I gave up from there.
Do I need to go with a lighter bullet?
Should I be shooting shorter (like 50 yds) to look for tumbling?
Any advice/loads to share?
The gun is a remington 700 sps tactical, 20" 1:9 twist barrel.