MiHec 359 220 in 35 Remington Contender.

[R8ed]

Back in 2015 I recieved the group buy MiHec 359 220.
I haven't cast it yet due to a move, but casting and reloading bench are almost ready.

Will I need to size bullets cast from the 359 220?
Do I need to slug barrel first to determine if sizing is needed.

Thanks in advance.

[Tatume]

Load a dummy cartridge. If it will chamber, then with reasonable charges of appropriate powder, you can use the bullets without sizing. However, best accuracy may be with or without sizing. You will have to make that determination.