Originally Posted by locotrician
how are you necking up your 300 rum to .338 i searched and searched and found nothing on it, been reloading for 10+ years but never necked anything up or down. thanks.
You just use the 338 sizing die and do a normal sizing and the expander ball will
take care of the rest.
Just make sure that you lube the inside of each neck before you start. (I use a cotton
bore swab the right size and rub the sizing lube on it or roll it on you size lube pad.
You are only enlarging the neck .030 so you should not have any problems.
J E CUSTOM