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Keep in mind that the tumbling and keyholing of the SS109 may be because its cheap SS109. Its a steel core wrapped in copper, in a lot of it the steel cores are not well centered so it isn't going to fly straight. That's why unless you're feeding a full auto gun (preferably belt fed) and plan on shooting at a lot of dudes in body armor its really best to just leave that crap alone.
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It's certainly not cheap ammo. It's General Dynamics stuff...part of a DEA (I think) overrun. It shoots really well in my M4. But it's got a 1/7 barrel, of course.
