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I've shot 1000's of white box ammo. Mostly 147 BEB's and 124 grain BEB's. They shoot good enough for government work outta my G17C. My Sig226 shoots them ok but really likes good old dirty American Eagle 124's.
The type of rifling does get gummed with lead as mentioned already. If you are set on shooting lead buy a spare barrel with conventional rifling. There are some available from dealers here on Gunnutz.