03-07-2025, 12:56 AM
6 Arc and 6.5 Grendel have a disadvantage in the weight/volume arena b/c they are relatively small... so a 1 gr delta translates to more % volume change than in larger, like 6.5 creed or 308 brass.
It's reasonable to find that weight delta=volume delta for a given mfr of the brass. I'd bet that hornady does their stuff in batches, and the QC is not real strict batch to batch.
The gr/vol relationship would a bit more, tenuous, when looking at 2 or more mfrs, since they can have differences in their actual mold/brass specs. Stonehenge did a study , IIRC, on this with lapua and some other 6.5 grendel brass, when looking at the specifics of the case head designs.
So far knock on wood my hdy 6 Arc brass seems, well, ok but not great, in consistency. I like starline more for that, and in 308 I have some great LC brass and some lapua's that are outstanding in consistency. At least, they are the easiest to get a good load for. I'm not in the league of Stoney or others who are shooting competitively (that would include you if you are so inclined!), just an average guy who likes to find a good load. When I get single digit SD and teen's for ES, I feel like I can take them to the field.
I am starting to break into my starline 6 Arc brass, so even these hdy's could be getting left on the shelf soon.
It's reasonable to find that weight delta=volume delta for a given mfr of the brass. I'd bet that hornady does their stuff in batches, and the QC is not real strict batch to batch.
The gr/vol relationship would a bit more, tenuous, when looking at 2 or more mfrs, since they can have differences in their actual mold/brass specs. Stonehenge did a study , IIRC, on this with lapua and some other 6.5 grendel brass, when looking at the specifics of the case head designs.
So far knock on wood my hdy 6 Arc brass seems, well, ok but not great, in consistency. I like starline more for that, and in 308 I have some great LC brass and some lapua's that are outstanding in consistency. At least, they are the easiest to get a good load for. I'm not in the league of Stoney or others who are shooting competitively (that would include you if you are so inclined!), just an average guy who likes to find a good load. When I get single digit SD and teen's for ES, I feel like I can take them to the field.
I am starting to break into my starline 6 Arc brass, so even these hdy's could be getting left on the shelf soon.