jschuerg62
Member
- Joined
- May 16, 2019
- Messages
- 2
I've got a question about whether to use an expander ball with a bushing die or not. I am in the process of working up a
load for a 6.5 PRC. I've got an RCBS Gold Match bushing die. I have been doing a lot of reading on bushing dies and
trying to fully understand the advantages/disadvantages of using one and also if it is intended to be used
with the expander ball or not. My understanding is that most expander balls are sized .001" smaller than the
bullet diameter, which in my case (using a .264 bullet) would be .263". Sooo below are two examples of cases with different
case neck thicknesses which I am going to calculate the bushing size for (-.001")
Case 1 (.015" neck thickness)
Bushing Size = (.015 + .015 + .264) - .001 = .293
Case Inside Diameter = .293 - .015 - .015 = .263 inside diameter
Case 2 (.013" neck thickness)
Bushing Size = (.013 + .013 + .264) - .001 = .289
Case Inside Diameter = .289 - .013 - .013 = .263 inside diameter
In every scenario if you are sizing the bushing .001 less the inside diameter of the case ends up
being .263 which is, from my understanding, what most expander balls are (.001 less than the bullet). Am I looking at this
correctly? If I am I don't see the advantage in using the expander ball.
Thanks in advance for any feedback....
load for a 6.5 PRC. I've got an RCBS Gold Match bushing die. I have been doing a lot of reading on bushing dies and
trying to fully understand the advantages/disadvantages of using one and also if it is intended to be used
with the expander ball or not. My understanding is that most expander balls are sized .001" smaller than the
bullet diameter, which in my case (using a .264 bullet) would be .263". Sooo below are two examples of cases with different
case neck thicknesses which I am going to calculate the bushing size for (-.001")
Case 1 (.015" neck thickness)
Bushing Size = (.015 + .015 + .264) - .001 = .293
Case Inside Diameter = .293 - .015 - .015 = .263 inside diameter
Case 2 (.013" neck thickness)
Bushing Size = (.013 + .013 + .264) - .001 = .289
Case Inside Diameter = .289 - .013 - .013 = .263 inside diameter
In every scenario if you are sizing the bushing .001 less the inside diameter of the case ends up
being .263 which is, from my understanding, what most expander balls are (.001 less than the bullet). Am I looking at this
correctly? If I am I don't see the advantage in using the expander ball.
Thanks in advance for any feedback....