Bullet jump

[Trad_man]

I've ran a 3 shot ladder test on my 6.5 prc using hornady 143gr eldx with Hodgman US869 an Federal 210 primers. My question is first 2 shot are close together but the 3rd shot is about an inch out from the others. Im just woundering Why? An what causes this? An how can i fix it? Thanks for your help in advance..

 

[Rick Richard]

I would think seeing the target it doesn't like that powder or load. It could be a lot of other factors, but I am assuming you checked action screws, scope mount and etc.

 

[RidgeTop]

What rifle?

 

[HSmithTX]

If it isn't you and the rifle is sorted out I would change seating depth drastically. I would go shorter by 20 or 30 thousandths steps back to 120 thousandths jump. Somewhere in there they will tighten up.

 

[manitou]

I have a rifle like that. Two very close... touching many times and one out 1/2"-3/4". All horizontal. Tried four bullets, three powders and seating from .005-.070. Nothing worked, so gave up for the time. A full custom nonetheless.

 

[RidgeTop]

Years ago there was a magazine article on just that. They had slow motion photos of the gases and how they could affect the bullet. Don't remember much about it.

 

[Trad_man]

What rifle?

Ruger American 6.5 prc

 

[Trad_man]

If it isn't you and the rifle is sorted out I would change seating depth drastically. I would go shorter by 20 or 30 thousandths steps back to 120 thousandths jump. Somewhere in there they will tighten up.

Ok ill try that.

 

[RidgeTop]

I found this for Santa. There is talk about boat tails having a factor.

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[dogz]

I've ran a 3 shot ladder test on my 6.5 prc using hornady 143gr eldx with Hodgman US869 an Federal 210 primers. My question is first 2 shot are close together but the 3rd shot is about an inch out from the others. Im just woundering Why? An what causes this? An how can i fix it? Thanks for your help in advance..

Ah...perhaps human error gave one a ride...?

Did you try the same group another time or two?

 

[Trad_man]

Every single time had a bullet jump. But the 65.5 grains of powder an the 68. Grs but the 68 grain load was a very hot barrle??

 

[ShtrRdy]

Is it always the third shot that is away from the first two?

I would suggest firing more shots as part of the group to see where the 4th, 5th, and 6th shots impact.

 

[Bob Wright]

Do you have speed data?
Velocity changes are vertical and seating depth is left to right generally. There is about a thousand other things if the gun needs accurizing.
But, I would try 1 powder load and look for velocity swings. Then doing a seating depth test with same weight of powder. Do a primer swap next. Each is it's own test.
It's tough to tell if more than one thing in your reloading is happening like different charge weights, primers etc.

 

[DENRIK89]

I've ran a 3 shot ladder test on my 6.5 prc using hornady 143gr eldx with Hodgman US869 an Federal 210 primers. My question is first 2 shot are close together but the 3rd shot is about an inch out from the others. Im just woundering Why? An what causes this? An how can i fix it? Thanks for your help in advance..

Before you pull your hair out BED the thing. Just a good recoil lug/action screw area bed job. And make sure the barrel isn't touching in the channel. Seriously