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Most plated bullets are not stable beyond 1200 fps or so. I am guessing you are about 200 feet per second above that?
Do your targets have what look like tears where the bullets go through? That indicates tumbling bullets and you won't get accuracy from them at high speeds.
I have even found the 1200 fps can be too much. It depends on your barrel twist and length too but in your case I'm guessing your too fast for those bullets which are probably made for 380 use.
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