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  • 2 weeks later...
On 2/12/2021 at 4:39 PM, Teamsterjohn said:

I’m showing factory loads out of my 40 cal STI/ McCormick gun. What weight spring would be best for me. Thanks

How fast are the factory rounds moving?

I'm shooting 180gr at ~950fps and using a 12# spring with my 2011.

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