Help with 6.5Grendel OCW

[ZLBubba]

I need some help translating my OCW results. I’m shooting a custom 6.5Grendel gas gun with a 22” 1:8 JP barrel. The load is with 8208 XBR, Hornady brass, federal match primers, and Hornady 129gr SST. I only saw a couple light brass swipes and no other pressure signs. Not sure what these results tell me. I know anything over 28gr of XBR is supposed to be nearing red line, but this rifle didn’t seem to mind the loads.

My shooting game wasn’t great today, but let me know what you think.

View attachment 6868551

 

[ZLBubba]

 

[padom]

You need to shoot a wider sample size. I see no consistent POI. Reshoot going down to 27.0 in .2 or .3g increments and repost.

 

[ZLBubba]

Here’s the first seven groups, all shot at 200 yards. Started at 26.7gr and went up by .2gr per load.

 

[padom]

27.7g. Now do a seating depth test to shrink that group size.

 

[ZLBubba]

Thanks!