05-05-2024, 12:22 AM
Interesting, thanks for doing this. It's a good starting point. Sounds like, in my terms, powder capacity of the starline is 0.3 grs bigger, which about the 1% charge delta for this cartridge case. Lever is pretty fine so that's a good reference to start with. Doesn't mean that each case will be ~30 fps different, have to see now what an equal powder charge in hdy and starline (1x of course) means for a typical bullet. I would figure that the ST then would be a slower MV but it should be checked to see.
Right now I'm using all Hdy 6Arc (but Starline in 6.5 Gr) but have some starline, just seems so far that the hdy is doing ok for me... or else I'm not noticing an issue. Consistency in case size is the most important thing. Biggest changes I've been handling so far is to fcd the AR rounds and use the fed 205M's for the bolt action (cci450 in AR). Those things are helping. I think!
In some Hdy 6.5 CM brass I have, I noticed that one batch (maybe from blank cartridges) weighs more than another bunch I have (I think these came from factory loads). Blank cartridges were 150-152 grs with some small outliers, and factory load cartridges were 144-145 grs with outliers. I set the 140-class brass aside and a couple test rounds with just the 152's seemed much more consistent (MV) for some 120 loads I'm looking at.
This 6Arc Hdy however, I don't notice a delta. But I could be missing it.
So the starline is just waiting on the shelf for its turn.
Right now I'm using all Hdy 6Arc (but Starline in 6.5 Gr) but have some starline, just seems so far that the hdy is doing ok for me... or else I'm not noticing an issue. Consistency in case size is the most important thing. Biggest changes I've been handling so far is to fcd the AR rounds and use the fed 205M's for the bolt action (cci450 in AR). Those things are helping. I think!
In some Hdy 6.5 CM brass I have, I noticed that one batch (maybe from blank cartridges) weighs more than another bunch I have (I think these came from factory loads). Blank cartridges were 150-152 grs with some small outliers, and factory load cartridges were 144-145 grs with outliers. I set the 140-class brass aside and a couple test rounds with just the 152's seemed much more consistent (MV) for some 120 loads I'm looking at.
This 6Arc Hdy however, I don't notice a delta. But I could be missing it.
So the starline is just waiting on the shelf for its turn.