300 prc N568 load development

[Mschroeder40]

To start off my rifle is:
Christensen arms ba tactical 300prc 26"
Dead air sandman s suppresor
Nightforce nx8 4-32x50 f2 mil
Vortex pmr rings
Mdt bipod
All shooting is off bipod and Armageddon gear bag on a table.
I have loaded for it with Ramshot Magnum with 78.5 gr and average of 2880 fps and .5 groups with 220 eld-x. I'm happy with it but I like to tinker and picked up some N568.
This load development is with Hornaday match Dies, Hornaday brass, CCI 250 primer, N568, and .20 off the lands with 212 eld-x. I started my ladder at 78gr and ended at 82.5 with no major pressure just light ejector marks. When I got higher in the charge weight around 81.5 and up they seemed to stack up closer in groups. I think I could go higher but I'm already past max which is 81.2 per Vihtavuori published data. Not the fastest but seems very accurate so far. I know my target isn't the greatest but it was just sitting there and it doesn't need to be official. There isn't alot out there on the N568 for the 300 prc so I thought I would throw this out there. Where do you you guys think that I should start on the ladder or should I push on up a couple of grains for more fps to see?
78 2731
78.5 2719
79 2765
79.5 2777
80 2782
80.5 2802
81 2821
81.5 2824
82 2876
82.5 2897

 

[Phil Rizzo]

Were 81&81.5 impacts close like the velocities?
What distance was this test conducted?

 

[Dmagna]

Can't get enough of it in the case, N568 doesn't give the speed needed in the 300 prc. You should be over 3000 fps with a 212. Also invest in better brass, go buy some lapua, hornady is junk in the PRCs

 

[Dmagna]

I ran into the same problem with n568, N570 gives way better speed but wasn't accurate in my rifle. I settled in with H1000 and a Berger 215 at 2980 fps.

 

[Mschroeder40]

Were 81&81.5 impacts close like the velocities?
What distance was this test conducted?

They were a little farther apart. 100 yards

 

[Phil Rizzo]

They were a little farther apart. 100 yards

If you have access, go to 200-300yds or beyond.
It will provide more obvious data for you, as far as grouping and separation.
And DO make .1gr changes to find the best load.
Good luck

 

[Mschroeder40]

Yeah I have Lapua in 6.5 prc it's definitely better brass. But I have about 300 pcs of once fired Hornaday brass in 300 prc from all the factory ammunition I've shot. I also have Ramshot magnum and Rl26 but I want to develop a load with N568 because it seems to be very consistent and accurate.

 

[Mschroeder40]

I'm thinking of going a little higher in charge weight by .2 increments and seeing how it goes. May go just above 83gr. The grouping seems decent thus far.

 

[Dmagna]

I filled the entire case and couldn't get the performance of H1000.

 

[captainemil]

Might have a weak ejector spring, Were the pin hits the primer is not wavey and the primer is not flatted out either, I do not see any pressure signs that are really bad. My brass looked horrible compared to yours and was with factory ammo . The 212 Precision was flat and wavey primers and the 225 match had a sticky bolt along with flat primer, ejector mark and wavey primer where the firing pin hit.

 

[Dmagna]

The ejector marks are very typical of a Christensen arms. Never shot one that doesn't do this.