28 nosler ladder test

Blaster01

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Did a ladder test with my browsing hells canyon 28 nosler. New gunwerks brass, n566, 162g eldm, and federal 215m primers. Here are the results for velocities. Where would you start after seeing this?
FF622F3D-21AC-496F-BCFB-9CC8EF56A5E1.png
 

Bob Wright

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1. 79.2 to 80.0
2. 80.2 to 80.6
Seems like #1 offers a very wide flat in velocity. I would start here looking for a node.
#2 also has a flat, not as wide, but assuming you are close to max charge. It's worth doing if #1 doesn't settle down in ocw testing.

Speeds are very close in either so I would prefer to be off the max load in #2.
 

Blaster01

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1. 79.2 to 80.0
2. 80.2 to 80.6
Seems like #1 offers a very wide flat in velocity. I would start here looking for a node.
#2 also has a flat, not as wide, but assuming you are close to max charge. It's worth doing if #1 doesn't settle down in ocw testing.

Speeds are very close in either so I would prefer to be off the max load in #2.
Forgot to mention I never had any pressure signs and I was .2 grains away from max load in the book with the last shot. I was thinking of loading up 5 or 6 more going up the ladder and finding where I hit pressure and see if I can find another flat spot. I like that 80.2-80.6 velocity. I’m hoping I can get some good accuracy there.
 

Dmagna

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Keep going see what happens. Or load some up at 80.4 80.5 and 80.6. 5 shots each and see what the es and sd are. Then if it’s good do a seating depth test on that load and see if the groups tighten up.
 

Axl

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I would try it farther out- as far as you plan on hunting/shooting that combo if you can and look for least vertical
At 200 it's hard to tell what will be best.
 

Blaster01

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I would try it farther out- as far as you plan on hunting/shooting that combo if you can and look for least vertical
At 200 it's hard to tell what will be best.
Yeah 200 is the farthest I can get for now.
 

7mmTikkaShooter

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South Dakota
Did a ladder test with my browsing hells canyon 28 nosler. New gunwerks brass, n566, 162g eldm, and federal 215m primers. Here are the results for velocities. Where would you start after seeing this?View attachment 171817
79.8 or 80.4 appear to be the middle of two fairly flat node areas. I will suggest running the test a couple more times. One data set can be deceiving. If I had to pick one based off of this I’d say 79.9.
 

dsculley

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The problem with using just MV is that results can be misleading. For me, the target is always the final arbiter. Based on MV, you would expect 80.4 & 80.6 to be very close yet 80.4 is in the 7 ring and 80.6 is in the 10 ring. That is a lot of vertical. The problem with a ladder is that a one or more errant shots can skew the entire test. If it were me, I would set up an OCW test at 100 yds, find my node(s), then start testing at longer range to verify my load.

On this target 79.2 - 79.4 looks like a good place to start.
 

L.Sherm

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I shot a 3 shot group that all 3 were 3122fps at 100 yards, the group was 1.5.
The target at your intended range your gonna shot tells the story.
 

Blaster01

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Jan 26, 2020
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Salem
I should have clarified earlier in the post. But the test I’m doing is the ladder test that the 6.5guys are using. There’s a name for it but I can’t remember it. I’m kind of just experimenting with it to see if it works. I’m going to use it to find the nodes and then after that I’m going to try shooting some groups with charge weights that will put me in the middle of the velocity nodes and see how they shoot. And then finally I will do a seating depth test. I went out again today with 14 more shots loaded in .2 grain increments. Here are the velocities. The left side of the paper is the first time (same velocities from the top of the post) and the right side of the paper is from today. I still have not found pressure but there looks to be a node around that 3240 FPS area. Maybe someone with more experience with this test can help me interpret this better. I’ll be shooting it again and still going up in .2 grain increments until I find pressure. This gunwerks brass is tough stuff. There’s no load data for n565 on the 28 so I was using h1000 data and the max for that in the book is 81 grains. As you can see I’m well past that and still haven’t had a single sign of pressure.
 

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