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Excatly!
First I use a pipe-cutter to remove the case head. Then I size it to .458-.ish, using a home-made pushthrue sizing die in my hydraulic press. Last step is to drill a hole true the Berdan...

No lubing as the original design had a longer brass section with litle to no lead that did touch the rifling. Newer design does have lead engraved by the rifling so powder coating might be a good...

Yeah good plan to slug the bore.

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I'm thinking of converting the nose to a bore riding design. Any idea what dimension is suitable for a .458.

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300 m/s into sand.https://uploads.tapatalk-cdn.com/20200521/4884a7af437e79acaaf343a5fc9c6689.jpghttps://uploads.tapatalk-cdn.com/20200521/a1d5f12e81036bd3941ce1ee5f94eafc.jpg

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Yeah. Quick test.
Better now?
690 to 550 grain.https://uploads.tapatalk-cdn.com/20200520/3ce158dc671de199e8a910852d763594.jpg

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I've just finished my first mould. It uses the first 10mm of a 308 case as gas check.
A bit scruffy but works decently.
The aim is to shot the bullet subsonic in 458 win mag loaded with TinStar...

I'm building a .458x2 American out of an Savage 110.
Twist is going to be 1:10
17.7 inch barrel
Fully integrated silencer all the way back to the barrel nut and 8 inch in front of the muzzle....