300 BLK Build help

Leroy-J

Private
Minuteman
Oct 8, 2025
2
0
Oklahoma
Recently began considering doing a 300 blackout build. My criteria is quiet and accurate to 100 yards. Pretty simple right? lol. I always wrote the 300 BO off as a fad and didn’t get it but a dedicated subsonic rig seems like the solution for what I’m looking for. The reason is I live in a neighborhood but we have lots that are 2 to 3 acres and we are surrounded by farm land. Recently some coyotes have been seen and actually killed a neighbors little yip yip dog. So I’m looking for something to use on them hence it has to be quiet. The neighbors actually requested I take them out, but I don’t want anyone to know when I actually do lol. I have a spare AR lower so I have the option to build one in that platform or I was thinking a Howa Mini bolt gun. Any thoughts or suggestions? Still haven’t decided what can to go with either. I also thought about getting a big bore PCP air rifle but not sure.
 
I'm on the camp for a little bolt action with a cheaper ish thermal. You can use those digital night vision scope as well.

In all honesty the optic type (thermal/NV) is going to be a lot more important than the caliber.

From the sounds of it you can get pretty close and you will be taking pot shots.

I'm pretty sure a 22lr will work just fine with less risk than a full on high power cartridge.

A 300BLK with good ammo will smoke a coyote. If you take a good shot a 22 will work just fine too.

The concentration though should be on detection IMO.
 
  • Like
Reactions: spife7980
I'm on the camp for a little bolt action with a cheaper ish thermal. You can use those digital night vision scope as well.

In all honesty the optic type (thermal/NV) is going to be a lot more important than the caliber.

From the sounds of it you can get pretty close and you will be taking pot shots.

I'm pretty sure a 22lr will work just fine with less risk than a full on high power cartridge.

A 300BLK with good ammo will smoke a coyote. If you take a good shot a 22 will work just fine too.

The concentration though should be on detection IMO.
If it were only legal to hunt anything with a night vision scope in my state.
Coyotes now have a season on when they can be hunted.

You can own a night vision scope as long as you don't hunt anything with it.

And that could have changed in the last legislative session...
Last time I checked the scope could have a lighted reticle...but no other electronic gagets like a rangefinder inside the optic.
The rangefinder could be carried separately.
Catch and release fishing, if you raise the fish more than 12" out of the water while releasing it...that's a big fine...there are no small fine infractions these days.
 
The bolt gun is going to be cleaner and quieter than the AR pattern.

The AR pattern is quiet but you still have the BCG slapping about, making noise.
The drop on a heavy sub is stupid past 100yds. Off the top of my I forget what is was to 200 yds but it was significant but still fun.
For the AR pattern and 300 BO either use aluminum GI mags or 300 BO specific mags to avoid feeding issues. Been down this road.