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RE: some 44-77 questions
For that ten thousand deep groove I would suggest using a bullet with the right nose profile that will work with a soft 1/30 alloy and patch it at bore diameter or a little beyond if the throat will allow. I went with this problem with a groove a little deeper then your .010"
For that deep groove I would go with something on the order of this profile with a soft alloy but with a lesser diameter for your .436 bore that will make your paper thickness work.. https://www.buffaloarms.com/434-470-grai...-jim434470
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