6.5 PRC Seekins Element Seating Depth Results (N565, Berger 156 EOL)

[FattyBinz]

I know I know...I may have wasted way too much time and way too many components testing seating depth...and these groups aren't all dead-on reliable since your-groups-are-too-small...but I figured if someone on here wants to benefit off my results, best to share them.

Seekins 6.5 PRC Havak Element
N565, Berger 156 EOL, Federal GM210M Large Rifle Match Primers, Lapua Brass
Powder charge: 58.5gr

The shots at 200 yards are 4-shot groups, and those at 300 are 5-shot, shot on different days. Testing pretty much confirmed what people say about these Bergers: that they like to be around .020" off the lands. Really interesting to see just how insane the velocity ES and SDs got in that .010-.020" range (three consecutive groups with an ES of 1-2, sandwiched by three other groups with an ES of 6-9), not to mention the consistent group sizes. Farther I got out from there, the worse the groups and velocities got. Looks like I'm just going to pick the longer CBTO load of 2.347 and run with it!

 

[TradLife406]

You don't have enough sample data with four or five shots to see any real data.

The Hornady boys talked about this. They did a lot with 30 shot groups and couldn't see a big difference in seating depth changes. Out of an accuracy fixture too I believe. Set it to mag length and go.


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