Thanks for all the replies and suggestions.
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The 62gr bullets are steel core and longer than they would be if fully lead core. This adds overall length.
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These aren't pulled surplus bullets, and I think they're just conventional copper-jacketed lead-core.
Here's the link to the bullets on Midway's site.
These are being used in an AR, with a 1:9 twist. They function fine with about 24.0 gr of H335, but I just ran out of H335. I was given an 8-pound jug of AA2230, so I'm working up a load with that powder now. It sounds like there's really no point trying to "gnat's-ass" the charge weight or even the powder type with these bullets, since they're just range fodder for me (and it's a 25-yard indoor range, so I'm pretty much just shooting the 25-yard reduced Navy qualification target anyway).