190gr Hornady BTSP subsonic!!
 

I just finished shooting 10rnds at 100yds!!
300 Blackout/Whisper
190 gr Hornady BTSP
10.5 gr 4227
cci 400
LC brass
coal 2.240"
I fired 6 rounds then had a flier ( when I got finished cursing) I fired 4 more to have a total group of 10 rnds.
[IMG]http://img200.imageshack.us/img200/9...10rndgroup.png[/IMG]

Well done!

Wow! Are you sure you didn't shoot 5 times and then shoot the other 5 up through the air or into the ground? LOL! Good shooting, what where you using (the firearm)?

Bolt action rifle
Howa action, Schillen 1x8" 16" barrel #7 taper
Boyds stock
was built and trigger work by Kevin H. at ole's gunshop salem ore.:smile:

Any idea what velocity this load is giving? I am guessing close to 1200 fps.
I am now trying to develop a subsonic load for a 16" bbl.

I have no chrono but It sure sounded subsonic to me! I am shooting through a 16" barrel.

190 gr HPBT load
 

I am exceedingly impressed with your load for 300 blackout. I am considering building one and I have tons of 190 gr HPBT I use for my 300 wm and I am considering using this for a load for 300 blackout.

Anything I should look out for?

I have had no problems withit through my rifle..It shoots great.
My rifle was built for me By Kevin at Ole's Gun shop here is Salem oregon
his number is 503 585 3889 they are open Weds to Sat. Kevin has built me an AR15 Carbine upper and an AR pistol upper in this caliber also. and they all shoot great.:grin:

col for ar15
 

I am looking to use H110 with 190gr hpbt. what is a good col for use in an ar15 with this load? does 2.240' work well? all my other loads have been 1.950