Fell Victim to the 300 Blackout

[MGYSGT]

Yep, fell victim. So loaded up 100 ctgs. using the Sierra load data for 150 grain sub-sonic ammo. Ran some through the speedo-meter and was sad to discover, they were 1159 fps (sub-sonic is 1123 fps at sea level). Not sub-sonic. Had to pull the rest and start over. That's what happens when you break the basic rule of loading a new cartridge. Load 10 and test. Shame on me.

 

[ourflat]

Here Here…..load 10 and test!

 

[garandman]

I ended up running 220 gr to be sure they were subs. Coukdnt find anything much less gr weight..

 

[DocDoc]

I hope you unloaded them by firing?

 

[dellet]

Yep, fell victim. So loaded up 100 ctgs. using the Sierra load data for 150 grain sub-sonic ammo. Ran some through the speedo-meter and was sad to discover, they were 1159 fps (sub-sonic is 1123 fps at sea level). Not sub-sonic. Had to pull the rest and start over. That's what happens when you break the basic rule of loading a new cartridge. Load 10 and test. Shame on me.

You could just save them for next summer and shoot when it’s about 105+.

Altitude has little effect, temperature is what will get you.

Speed of Sound Calculator

 

[B23]

AR15 type or bolt gun? My 300BLK is in the form of a AR pistol.

 

[DirtySteve]

Just wondering are you at sea level? If not shoot them. If you are at sea level, shoot them.

 

[MGYSGT]

AR15 type or bolt gun? My 300BLK is in the form of a AR pistol.

AR Platform carbine.

 

[MGYSGT]

Just wondering are you at sea level? If not shoot them. If you are at sea level, shoot them.

I am retired, so lots of time to kill. Pulled them and reloaded. Good round nose 30 cal bullets are not too available around here right now.

 

[MGYSGT]

I ended up running 220 gr to be sure they were subs. Coukdnt find anything much less gr weight..

150 gr round nose. Wanted 180 round nose but couldn't find them

 

[DirtySteve]

I am retired, so lots of time to kill. Pulled them and reloaded. Good round nose 30 cal bullets are not too available around here right now.

Your doing retirement better than me. I still don’t have much time.!!! Lol

 

[LVLAaron]

Just cut 1 inch off your barrel.

 

[GotRDid]

Worked with supers yesterday and 135 gr Sierra SSPs in prep for Youth Whitetail weekend on Oct 9-10 here in KY.
Grandchildren of my Former Partner (shooting) and Son of a KTP Buddy will be using my BOs to hopefully take their first Deer. They are all 7-8 yrs old, and are excited to be going out with Papaw and Dad.

 

[GotRDid]

Are you shooting suppressed, and is this the reason you are striving for subsonic?
Likewise, are SP required for end use, and finally, why RN?
GotRDid.

 

[Park ranger]

View attachment 1283955
Worked with supers yesterday and 135 gr Sierra SSPs in prep for Youth Whitetail weekend on Oct 9-10 here in KY.
Grandchildren of my Former Partner (shooting) and Son of a KTP Buddy will be using my BOs to hopefully take their first Deer. They are all 7-8 yrs old, and are excited to be going out with Papaw and Dad.

View attachment 1283958

What is your load? Looks like a great bullet.

 

[Mikemci]

Be sure to test your drop at different ranges. Those rounds have a rainbow trajectory.

 

[MGYSGT]

View attachment 1283955
Worked with supers yesterday and 135 gr Sierra SSPs in prep for Youth Whitetail weekend on Oct 9-10 here in KY.
Grandchildren of my Former Partner (shooting) and Son of a KTP Buddy will be using my BOs to hopefully take their first Deer. They are all 7-8 yrs old, and are excited to be going out with Papaw and Dad.

View attachment 1283958

Nice expansion. Are they Sub or Super sonic.

 

[MGYSGT]

Are you shooting suppressed, and is this the reason you are striving for subsonic?
Likewise, are SP required for end use, and finally, why RN?
GotRDid.

Yep. After all the weapon was designed for indoor work so the neighbors wouldn't hear it.

 

[MGYSGT]

Be sure to test your drop at different ranges. Those rounds have a rainbow trajectory.

Thinking and tested at 50 yards. Farther than that and I have something different in mind.

 

[GotRDid]

Nice expansion. Are they Sub or Super sonic.

Supersonic.