cablecutter, I changed to the Wolff Gun Springs, non-captive two piece recoil rod with 21 lb dual spring set, this has worked very well for all the loads I've run thru mine to date. Many loads matching Underwod's line up. also switching to a 40S&W, 357Sig or 9x25Dillon conversion barrels no problem cycling the any of them using this RSA.
Do you need the heavier springs maybe not, but if you see the slide over running the ammo during feeding you may want to consider the extra power springs.
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