Loading M885 velocities for a 16" barrel

[Underwhere]

I have some SS109 I'm loading for a friend.
Both of us have 16" barrels and I'm having trouble finding the ideal velocity to mimick M885.

I can find velocities for a 20" barrel, just not 16"

Anyone happen to know this, or know where I can find it?

24.6gr of H335 with wolf primer in a RORG case gives me about 2800fps.

 

[rcmodel]

M855 should give you around 3,050-3,100 from a 20" barrel, and around 2,950-3,000 from a 16" weapon.
Duplicating it is pretty hard to do at safe pressure levels.
You could probably come closest with Varget powder.

Personally, I never load that hot.
I can get better brass & gun life by dropping down a tad from MAX loads.
With less risk of a tired case ruining my gun & face.

The steel targets & hedge balls I mostly shoot at can't seem to tell any differance.

Were I fighting in Iraq, that last 100 -200 FPS might matter.
Here, it doesn't.

rc

 

[Underwhere]

Thanks for the advice.

So do you think that around 2800 or so should be a good upper limit for this?

 

[rcmodel]

Your load sounds fine to me.

It is 0.4 grains below max listed in the Hodgon powder guide with the 63 grain Sierra.

Better safe then Mil-Spec I think!

rc