The Berrys I have shot were soft lead inside with a thin copper shell so the bullets obturate well and fill the bore.
Like wvbearhunter said I would slug the bore to see the exact size.I have a Marlin Cowboy that will not shoot and .429 bullet well at all so I slugged the barrel and got real close to .431 so I cast my bullets for it or places that cast bullets can cast a custom order for me like Montana Bullet Works.Just a thought.
That rifle now is a tack driver!
Like wvbearhunter said I would slug the bore to see the exact size.I have a Marlin Cowboy that will not shoot and .429 bullet well at all so I slugged the barrel and got real close to .431 so I cast my bullets for it or places that cast bullets can cast a custom order for me like Montana Bullet Works.Just a thought.
That rifle now is a tack driver!