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Originally Posted by dcon27
Is the difference really that SIGNIFICANT when comparing a 509mm to a 650mm tight barrel?
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529 is the longest I've used, so I'm afraid I can't help you with that one.
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Originally Posted by dcon27
PDI is better than guarder?
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That depends. I think that Guarder springs are generally more consistent than PDI ones, but I've had very good luck with PDI 150% springs. PDI springs tend to lose velocity faster over time after breaking in, in my experience.