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Author Topic: Jasonís 338-375 Ruger Build  (Read 3732 times)

Offline Jason

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Re: Jasonís 338-375 Ruger Build
« Reply #45 on: December 28, 2019, 08:49:23 PM »
Loads development as follows, 5 shot strings at 100yds.

H4350 with 250 Accubonds
76.0gr avg speed 2888fps, 1Ē group
76.5gr avg speed 2912fps, best group at .75Ē
77.0gr avg speed 2938fps, 1Ē group
No pressure signs with above loads.

H4350 with 250gr Berger Elite Hunters
76.0gr avg speed 2863 fps, 3Ē group
76.5gr avg speed 2900fps, 2.25Ē group
77.0gr avg speed 2915fps, 3.375Ē group
Loads speeds were all over the place. Groups were bad, will run strings again with Bergerís seated to the lands. Above Berger loads seated short to fit in mag. No pressure signs.
« Last Edit: December 29, 2019, 05:31:10 PM by Jason »

Offline jasnt

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Re: Jasonís 338-375 Ruger Build
« Reply #46 on: December 29, 2019, 04:47:02 PM »
With the 250gr Berger I had best groups at 20 k off or 10k jammed   Jme
243Round ct. 639
338rc 773
338 lapua rc 174
37XC rc 75
2020 Rifle rc 14

The commission shall attempt to maximize the public recreational game fishing and hunting opportunities of all citizens, including juvenile, disabled, and senior citizens.
https://apps.leg.wa.gov/RCW/default.aspx?cite=77.04.012

Offline Jason

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Re: Jasonís 338-375 Ruger Build
« Reply #47 on: December 29, 2019, 05:04:52 PM »
With the 250gr Berger I had best groups at 20 k off or 10k jammed   Jme
Thanks for the info 👍

I loaded them 20k off, I will load the next Berger rounds 2k off, touching and jammed and see what those groups look like.
I still have plenty of room for the Accubonds to go longer. I will run another batch of virgin brass at a half to full grain higher and see what pressure looks like.

Offline Jason

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Re: Jasonís 338-375 Ruger Build
« Reply #48 on: December 29, 2019, 05:36:47 PM »
Jasnt, FYI Atlas Development Group is taking preorders on 300 prc brass.

Offline jasnt

  • Predator hunter
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  • Location: deer park
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Re: Jasonís 338-375 Ruger Build
« Reply #49 on: December 29, 2019, 06:36:13 PM »
Jasnt, FYI Atlas Development Group is taking preorders on 300 prc brass.
Thank you but I got enough brass to finish this barrel off. 
243Round ct. 639
338rc 773
338 lapua rc 174
37XC rc 75
2020 Rifle rc 14

The commission shall attempt to maximize the public recreational game fishing and hunting opportunities of all citizens, including juvenile, disabled, and senior citizens.
https://apps.leg.wa.gov/RCW/default.aspx?cite=77.04.012

 


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