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Ted,
You might also try seating the bullet out to where it lightly touches the rifling.
This might end up with a longer OAL than will feed in the magazine, but try some single-loaded. You probably won't be able to crimp them in the groove anyway, doing this. If it works then you can hunt down a Lee factory crimp die and make your own crimp groove.
Also make sure that there is no copper fouling in the barrel.
You might also try seating the bullet out to where it lightly touches the rifling.
This might end up with a longer OAL than will feed in the magazine, but try some single-loaded. You probably won't be able to crimp them in the groove anyway, doing this. If it works then you can hunt down a Lee factory crimp die and make your own crimp groove.
Also make sure that there is no copper fouling in the barrel.