You are wise to have these concerns.
My DW 1911 throws brass into the next county, even after spring changes, extractor tuning, etc. The brass bounces off the surrounding structure(s) and goes...who knows where.
Note that this is an indoor range, where I shoot regularly...but I can lose 30-40% of my brass...and to be honest, that annoys me enough that I shoot that pistol quite a bit less than I would otherwise.
On rare occasion I find some 10mm brass at my range. We are talking maybe 15-25 rounds...and that is enough to make my day, because it happens so infrequently.
Most recently (maybe a month ago) I found almost 50, and was practically beside myself.
However, a couple had some 'out-of-round' that was notable even in the dim light of the range.
As soon as we walked out of the actual firing lanes, I dumped them all on the counter and started examining them under better light. And rolling them around.
Bottom line, I ended up throwing all of them in the trash before I left. Just about killed me to do it...I was rationalizing to myself that I only reload lead target rounds at modest velocities, and...and...
Nah. I'm old enough to realize that I've done about a million stupid things in my fairly long (so far) life...and gotten away with a large percentage of them. Even at brand-new Starline prices, I threw away what? Eight bucks worth of brass (that I paid nothing for)?
And whether it matters or not, yes, they all had the distinctive rectangular striker mark.
I don't want to derail the conversation, but for the last 18 months or so, I had been considering buying a G20SF just to double my 10mm fun.
After doing (quite) a bit of reading, I'm going to pass on that. I have enough heartache in my life already.
I've reloaded nickel case's on the 10 mm 4 round's and more.
Wow, four whole reloadings? That is bottlenecked rifle brass territory.
I guess I am spoiled by loading/shooting .45acp. Brass or nickel, I have yet to see any reason to toss any of them. That's the difference between a round that operates at 18,000 psi and one that operates at twice that pressure. And if I lose some .45acp brass...who cares? If I only get four loadings out of every piece of .45acp brass I own, I will have to work hard to use them all.