How does Pistol length vs Carbine length effect load development (300 AAC BLK)?

incorrigible

incorrigible

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According to the Hodgdon website for 300 AAC Blk the load development table suggests between 14.3 and 15.3 grains of H110 pushing a Hornady 168 grn HPBT (COL 2.230") , Small Rifle Magnum primer.

However the load is developed for a 16" barrel 1 in 8 twist and I'm developing a load for a 7.5" barrel (piston length gas system) with a 1 in 10 twist for an AR15.

Any suggestion from the more experienced amongst us as to how the different barrel lengths would effect the load and perhaps a suggestion by as to what a reasonable start range may be for supersonic?
 
Keep in mind that not all published data will cycle a semi auto rifle.
You'll just have to try loading some and see if they'll cycle your rifle. I found that H110 isn't the best powder for loads over 130gr in a semi auto. For semi's I've found that H110 is good for 110-130 gr and Lil'Gun is a better powder for 130+ gr projectiles. I also switch to A1680 for shooting 208gr subsonics.
In a bolt action you can use all published data as long as you start below max and work up slowly watching for pressure signs.
I have two semi auto's and a bolt action in 300BLK.
 
The blackout is so new and there are so many varables you will not get a carved in stone answer

ask a question about 45acp and you will get hundreds of answers

I have also heard that Some of the 300BO Load data is on the hot side so work up some loads and Dont make 500 pcs before you try it

Do a search and let us know what your results are
 
cr5 said:
Keep in mind that not all published data will cycle a semi auto rifle.
You'll just have to try loading some and see if they'll cycle your rifle. I found that H110 isn't the best powder for loads over 130gr in a semi auto. For semi's I've found that H110 is good for 110-130 gr and Lil'Gun is a better powder for 130+ gr projectiles. I also switch to A1680 for shooting 208gr subsonics.
In a bolt action you can use all published data as long as you start below max and work up slowly watching for pressure signs.
I have two semi auto's and a bolt action in 300BLK.
Click to expand...

I was able to get a lb of A1680 for my 208s as well... seems to be like hens teeth to find any more though. I'll see what I can do about grabbing some Lil'Gun for the 168s. Thanks for the feedback ;)
 
incorrigible said:
According to the Hodgdon website for 300 AAC Blk the load development table suggests between 14.3 and 15.3 grains of H110 pushing a Hornady 168 grn HPBT (COL 2.230") , Small Rifle Magnum primer.

However the load is developed for a 16" barrel 1 in 8 twist and I'm developing a load for a 7.5" barrel (piston length gas system) with a 1 in 10 twist for an AR15.

Any suggestion from the more experienced amongst us as to how the different barrel lengths would effect the load and perhaps a suggestion by as to what a reasonable start range may be for supersonic?
Click to expand...

You won't see subsonic velocities until you get down around 10gr of powder.
 
I have tryied the 167gr scenar in both my AR-15 (Daniel defense 16'') and my bolt action and have very good result with 18.5gr of AA1680 @ 1860fps very accurate
also in my Ar with some 220round nose sierra around 10.5 gr of AA1680 for subsonic load
 
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