Are the Speer cases made with smaller case capacity or something?? I have a ton of those.I sort by caliber and pluck 1 sample case per headstamp/manufacturer and do a case volume check using water--I have a conversion chart taped to my bench I made-up using online sources and Excel...if they are consistent or darn close, I mix em up into 200 round lots and load...if one maker (SPEER brass in .40 comes to mind) is quite a bit different, I pull them from the lots and load them all together...
in 9mm or .45 you should be ok to just mix em up and run loads; I just like the security and consistency of the additional step because of the .40s pressure levels...
Excellent Question OP
I no longer load 9mm...so I hadn't looked at specs in awhile...9 mm has same SAAMI operating pressure as .40 , or dang close. if you sort for 40 bc of operating pressure you may consider doing it for the 9 also????
they seem to be a tad smaller volume-wise...I believe it has something to do with the thicker web at the base...not a gigantic difference but its enough to make loads chrono wonky...so I add a tiny bit less charge to them, seat the OAL .001 shallower and they run fine...Are the Speer cases made with smaller case capacity or something?? I have a ton of those.
I'm sure you actually could have...I only use reloads for targets and practice. If you use your own reloads in a defensive situation you will get put in prison.
Sorry. I couldn't stop myself.