04-15-2022, 02:58 AM
I went back to the range with a variety of charge weights from a variety of different powders. I used AR Comp, Benchmark, Varget, BLC(2), and CFE223. Still ran into ejector swipe earlier than I figured. I still need to go lower to find charges with no swipes.
While processing some brass I realized something that I'd like to get some opinions on. The fired cases are coming out with a 1.223" length to shoulder using the proper comparator. I'd sized the cases to 1.213" previously because my other Grendels produce fired brass that measures 1.217" or 1.218". It seems that the chamber/bolt combination for this rifle allows for significantly longer cases than my other Grendels. I swapped the BCG's between the Grendels and the results were kind of interesting... at least to me. With this rifle, I can bump the shoulder back to 1.218" and they chamber just fine. If I try to chamber that same round in my other Grendel it won't return to battery. My 1.213" cases do allow the BCG to return to battery in that other Grendel. Both bolts have bolt head depth measurements .137" so the variance is somewhere else.
I really don't mind keeping my brass separate for different guns. I also don't want to have to if I don't need to. Would an apparent headspace of .010" have any impact on the marks that I'm seeing? Obvoiusly case life may suffer from oversizing the cases and I get that part.
While processing some brass I realized something that I'd like to get some opinions on. The fired cases are coming out with a 1.223" length to shoulder using the proper comparator. I'd sized the cases to 1.213" previously because my other Grendels produce fired brass that measures 1.217" or 1.218". It seems that the chamber/bolt combination for this rifle allows for significantly longer cases than my other Grendels. I swapped the BCG's between the Grendels and the results were kind of interesting... at least to me. With this rifle, I can bump the shoulder back to 1.218" and they chamber just fine. If I try to chamber that same round in my other Grendel it won't return to battery. My 1.213" cases do allow the BCG to return to battery in that other Grendel. Both bolts have bolt head depth measurements .137" so the variance is somewhere else.
I really don't mind keeping my brass separate for different guns. I also don't want to have to if I don't need to. Would an apparent headspace of .010" have any impact on the marks that I'm seeing? Obvoiusly case life may suffer from oversizing the cases and I get that part.