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McGuire Ballistics .277 High BC/Heavy hunting bullet

I just finished testing with McGuires 129 today and got up to 66gr of H4831SC. No pressure and 3211 FPS. Printed a half moa group at 64.5 with virgin ADG brass. Now that I've got some fire formed brass I can really dial this in. Looking forward to the heavier one coming out.

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