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Discussion Starter · #1 ·
I'd like to have 500 FPS with .30s at a manageable bolt pull. Is there anything higher than the PDI SPR 300% or would that suffice?

What's the FPS with .30s if you get 550 with .20s?
 

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The PDI 300% is way more than you need. The 250% is about 590 with a .2 ('jsut bought an SS3000' thread). You can hit 500 with a .2 with the stock spring, and a nicer piston, you might need the equivalent of a m150-m160, I think the laylax sp150 or sp160 will do the job, not sure what that is in PDI terms.
 

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Laylax et. all rate based on meters/second w/.2's. I believe Guarder rates on .25's.

PDI rates based on a percentage. a PDI 100% will give you 1.00 joules (presumably measure with .2's) which equates to 328 fps with .2's. Thusly, a PDI 250% will give you 2.50 joules.
 
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