Neck Runout
Quote from Reloader on January 8, 2013, 4:40 amI am running Dillon 308 dies on my 550B and experiencing more neck runout than I like during sizing. In some instances the runout is in excess of .012. I am lubricating the exterior of the cases with either One Shot or DCL but not the inside of the necks. I have been reluctant to lube the inside of the necks due to powder sticking to the inside of the necks during charging. I believe the problem is being caused by the expander being drawn through the neck on the ram downstroke. I have run cases through the sizing die without the expander and runout is .001 or less. Runout is greater with cases with thicker neck walls with the expander plug installed. I have a Whidden floating tool head installed on the press.
Has anyone experienced a similar situation and effectively solved the problem? I guess one option would be to use brass with thinner neck wall thickness, turn the necks or find a lubricant that impair powder flowing into the case. BTW the greatest runout is being experienced with Federal Match Brass with a samples yielding neck wall thicknesses between .015 and .016.
I am running Dillon 308 dies on my 550B and experiencing more neck runout than I like during sizing. In some instances the runout is in excess of .012. I am lubricating the exterior of the cases with either One Shot or DCL but not the inside of the necks. I have been reluctant to lube the inside of the necks due to powder sticking to the inside of the necks during charging. I believe the problem is being caused by the expander being drawn through the neck on the ram downstroke. I have run cases through the sizing die without the expander and runout is .001 or less. Runout is greater with cases with thicker neck walls with the expander plug installed. I have a Whidden floating tool head installed on the press.
Has anyone experienced a similar situation and effectively solved the problem? I guess one option would be to use brass with thinner neck wall thickness, turn the necks or find a lubricant that impair powder flowing into the case. BTW the greatest runout is being experienced with Federal Match Brass with a samples yielding neck wall thicknesses between .015 and .016.
Quote from Reloader on January 9, 2013, 4:29 pmI can't comment on an aftermarket toolhead. With the factory toolhead, we suggest you always tighten die lock rings with cases up in the dies. The Dillon size die, whether steel or carbide, has a carbide expander ball to reduce friction.
I can't comment on an aftermarket toolhead. With the factory toolhead, we suggest you always tighten die lock rings with cases up in the dies. The Dillon size die, whether steel or carbide, has a carbide expander ball to reduce friction.