11-03-2021, 11:55 PM
Hmmm. That's funny the gas gun Hornady load data I have 1) only goes up to the 105, 2) lists varget for that bullet as 24.2 (2200) to 27.0 (2450). Unless there's more Hornady data, this was released with the release of the 6Arc.
So even if you use the 108 you're liable to get only 2400 under these circumstances with Varget. It is a relatively big kernel for the 6Arc case. ps, do a seat-to-lands measurement also with an OAL chamber gauge and modified case. Guys have been known to stick the bullet in the lands and make a powder mess getting it unstuck.
When I model the 108/varget in my grt - which differs from QL -- I do not show over pressure.
All that being said, QL is known to be first of all, needing of lots of tweaks to set up for your gun, and second, it has trouble modeling short, fat AR cartridges like grendel and 6Arc (which is derived from the grendel). This is a well-known talked about feature on 65 Grendel forum.
I will admit I am not expert in QL, I find it too hi-maint for my personal tastes. The users on the 65 forum that do use it have worked on their models for quite a bit, and use it only as a guide at that.
Best way for you to do load development is to start out low and increase your loads in a 0.2-0.3 gr increment. Watch for pressure signs. And do it over a chrony. That way you will know what your rifle/barrel will do. I would advise starting at low, 24.2 but IMO the first grain doesn't give you much useful data... but starting no higher than 25.0. Get a ladder for your case, primer, powder lot, seating depth and chamber specs and barrel performance. The real thing is better than anyone's data model.
So even if you use the 108 you're liable to get only 2400 under these circumstances with Varget. It is a relatively big kernel for the 6Arc case. ps, do a seat-to-lands measurement also with an OAL chamber gauge and modified case. Guys have been known to stick the bullet in the lands and make a powder mess getting it unstuck.
When I model the 108/varget in my grt - which differs from QL -- I do not show over pressure.
All that being said, QL is known to be first of all, needing of lots of tweaks to set up for your gun, and second, it has trouble modeling short, fat AR cartridges like grendel and 6Arc (which is derived from the grendel). This is a well-known talked about feature on 65 Grendel forum.
I will admit I am not expert in QL, I find it too hi-maint for my personal tastes. The users on the 65 forum that do use it have worked on their models for quite a bit, and use it only as a guide at that.
Best way for you to do load development is to start out low and increase your loads in a 0.2-0.3 gr increment. Watch for pressure signs. And do it over a chrony. That way you will know what your rifle/barrel will do. I would advise starting at low, 24.2 but IMO the first grain doesn't give you much useful data... but starting no higher than 25.0. Get a ladder for your case, primer, powder lot, seating depth and chamber specs and barrel performance. The real thing is better than anyone's data model.