A little advice please

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I just purchased a like new Swing Lock sizing die in .45 cal and I'd like to ask for advice on what diameter to size the bullets. I will be likely using pure lead I bullets. I slugged the barrel and it measures .451". Should I size to that or go .0005"-.001" larger.
 
That's the beauty of this sizer in that it can be adjusted for any bullet. I'm planning on using some pure lead I-bullets, some Hornady XTPs and Sierra 300 gr jacketed.
 
The jacketed bullets that are not bonded will not hold on size, they will spring back after a few hours or few days.
 
Hankins Custom Rifles has a video demonstrating how to size the bullet to fit your barrel. Arrowhead also has a video where he runs the bullet through two or three times to limit bounce back. An .50 caliber wool wad or a vegetable wad are recommended by most shooters.
 
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