Which load? Help please

[LongGun-308]

I have a custom 6.5 prc. It’s on a defiance tactical with an ace straight contour barrel at 32” at 1 1/4”. I’m using 147 eldms and h4831sc. I have n565 but I like the velocity with the h4831sc. I have some data from my last range visit. I’m not sure where to pick, for my seating depth tests

 

[KMW 1954]

I cannot make out the numbers you have written on those targets but in this order I would retest to see if I could get them to repeat.

1st picture, center target, then bottom left. 2nd picture, Top left, center. Would also load .2gr higher and lower of each of those. Se if those repeat also.

 

[williepete]

I would go with 54.1 and start seating depth test

 

[Doom]

I'm assuming this is some sort of OCW test. I would not put a lot of value in the 3 shot chronograph data outside of giving you approximate velocity vs charge. The target you used makes it hard to judge the average point of impact between each charge weight and unfortunately there doesn't seem to be any consistency which is what we are looking for. I don't know if you are shooting round robin or not but the sight-in target you are using is making you move the rifle/setup quite a bit between charge weights that can introduce some changes in the POI. I use this target:

https://accurateshooter.net/pix/ocwtarget.pdf

Others like to use a wide horizontal line with aiming dots which works very well.

I hesitate to pick a charge for this test because there doesn't appear to be any consistency in POI from one charge to another. You have a couple of good groups but both are on the center target. The outer groups are much worse which leads me to believe this is shooter induced from changing the setup.

 

[KMW 1954]

I use something on this order. though in this instance this was a practice target.

 

[Sandstorm]

Shoot them over a horizontal line in 3 shot groups and you will see a clearer pattern. Like above post
Then find your lands in the rifling and move out in .003 or .005 and see what ya get as you move further out.
You can go the other way but I dont like to jam them myself.
Also consider you may not have the right bullet.....so more to ponder..try a Berger

 

[LongGun-308]

I did shoot them in three shot groups. I wasn’t really looking for group size. Mostly just trying to find velocity node. Every other gun I have hasn’t shot this wide spread before. So I was just seeing what people would recommend for a good node and then try seating depth and tightening up the runout. But the run out that I do have right now is very minimal. I have been wanting to try some Berger bullets and I was thinking the 144s. This rifle is gonna be strictly for 1000 yards and beyond. It’s just a intro into ELR shooting and tuning

 

[L.Sherm]

There is no velocity node.
It is true that certain cartridges with certain bullets shoot good at a certain velocity but thats only because everything else is in tune( powder, primer, seating depth etc) not just because it shoots a certain velocity

 

[L.Sherm]

Numbers mean nothing, did you notice your biggest E.S was your smallest group.