Seating Depth Results

smoothie25

Well Known Rokslider
Joined
Mar 6, 2016
Messages
120
Location
Illinois
Hi All, I'm working up a load for a new bullet. I found a powder node that had SD 11, ES 21.

Ruger American 243
Sierra Gamechanger 90gr
H4350
Fed 210
Win brass (fired several times in the rifle, trimmed and annealed)

I shot the ladder at 2.26" which is mag length. I used Berger's suggested seating depth test and loaded at 2.22", 2.18" and 2.14". These are my results. Let me know your thoughts on whether or not I'm close or should seat deeper. Should I try another primer?

Also, any idea why my first two shots were nearly touching then 3rd shot is off? I shot three bullets with no break between shots then waited to cool to ambient temp before shooting the next group. It's a sporter barrel so barrel warming up?
 

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smoothie25

smoothie25

Well Known Rokslider
Joined
Mar 6, 2016
Messages
120
Location
Illinois
Is that the only bullet you've tried?

I shot several hundred Nosler Varmageddon 70gr thru this gun. They shot MOA out to 500. Just wanted to try something else I could get my hands on since inventory has been low lately.


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RS_Non-Res

Well Known Rokslider
Joined
May 1, 2021
Messages
248
I've been told to work out the seating depth first. Then matrix the powders and charges. Also 5-shot min, 7 better for reliable stats. Barrel temp often makes a real difference, the only uniform possibility is "cold", so it takes time.
 
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