Crimping check

[RichCoyle]

I was getting as much as a hundred feet per second spread in my velocities so I checked with Steve. He asked about the brass. I told him, "man I have no idea how many times I fired that brass," so he suggested I try some new brass. I did. While I was at it I decided to do a crimp test also since, well since that's what I do. Steve was right.

I used the same six pieces of brass throughout. Maybe you notice the velocities are way more consistent compared to the worn out brass.

Here are the results:

 

[Rosebud]

I use a lee factory crimp die at one eighth turn. How are you crimping? But the results look very good. Nice!

 

[RichCoyle]

Rosebud,

I use a Lee factory crimp die lightly screwed down to touch the mouth of the case. That is "zero" for me. I marked the lock ring and the top of the Lee die so I can see how much I turn it when it is turned. I first started with 1/8 of a turn and called it 2/16 and then I turned it 1/16 more and called it 3/16". When I was using H4831 I found the best accuracy at 7/16 turn.