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Bullets in the .455 range are probably meant for .45 Colt. The most important question is the weight appropriate and will they feed correctly.
To answer your other questions - Yes, a starting charge will be OK.
Yes, they make "bullet sizers" Google "Lee .452 sizing die". Bullet casters use these to size bullets.
Honestly, the bullets will probably swag down in size when seated into the case. If you use a Lee factory crimp die it should size down any bulges in the case.
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