I’m completly happy with my 40s. I have NOE 403165 running at 1140 fps out of my 5 inch Springfield. Gets 1050 out of my P229. The Sig did an 11 inch 5 shot group at 100 yds with that load. Very happy. But, my mind keeps drifting to 10mm.
I’m never shot one...yet. But looking at my reloading manuals, I don’t see much gain to be had. Going from 38 Spl to 357; it’s all about getting twice as much pressure. From 40 to 10, based on SAAMI, 2500 psi difference. That means not a discernible difference when you’re at 35,000 psi.
Of course 40 brass cost somewhere between free and cheap. 10 brass will cost money.
What would I use a 10mm for? I’m guessing not much after getting loads worked up and exploring the caliber a little. Here outside of Austin, we don’t have any bears. We do have bares. But they pretty much keep to themselves in Hippy Hollow so they’re not a problem. Me being a redneck, they’re as scared of me as I am of them.
So what would another 0.145” case length do for me? Anyone tried a 10 and thought it was not worth the effort?