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Never dreamed .001" would make that much difference.

Couple of thoughts come to mind. Did you wipe the bore with a wet patch before trying to seat the .501" bullet? It's a common routine.

Do you know the hardness of the alloy those bullets are made of?

I am..........disturbed.

Concerning the difference between man and the jackass: some observers hold that there isn't any. But this wrongs the jackass. -Twain