Load for 10.5 barrel with H110 and Sierra 175 HPBT

[milehipo]

Looking for a decent Subsonic load for a AR15 10.5 barrel using Sierra 175gr HPBT and Hodgen H110.
Thank-You

[Scalce]

Originally Posted by milehipo

Looking for a decent Subsonic load for a AR15 10.5 barrel using Sierra 175gr HPBT and Hodgen H110.
Thank-You

I am running around 9.2 grains of H110 in PMC or LC formed cases with Wolf 223 primers, 175 SMKs, and OAL of 2.17".

Your chamber may obviously be different.

This keeps me in the low 1000fps range.

[milehipo]

Can you tell me how many rounds down the barrel and what kind of groups are you getting?

[Scalce]

The barrel is a 10.5 SS 1x8 twist made by Teppo Jutsu with about 300-400 rounds through it.

I am not getting great results with H110 as I get severe stringing issues.

I need to run a bunch of supersonic loads to see if it helps the barrel settle down.

I am now trying AA#9 and 2400 to see if that works any better.

So far AA#9 does not show nearly the vertical dispersion that H110 does.

[milehipo]

Yes with my 10.5 SSK Upper and using H110 I am getting verticle stringing at 3-4" groups. Someone suggested smaller oal but I think I am going to try a diffeent powder.

[Rancid Coolaid]

I have experienced terrible vertical stringing with H110 loads, switched to lil gun and #9 and the problem went way.

I avoid H110 now.