6BRA Primers

[mikeeg02]

My next questions are what scale are you using ?

What shot came out of the groups ? 1? 5? In the middle ?

Was there wind flags ?

Were you being mindful of flags ?

 

[dgeesaman]

My next questions are what scale are you using ?

What shot came out of the groups ? 1? 5? In the middle ?

Was there wind flags ?

Were you being mindful of flags ?

1) Just picked up an Entris 64-1. I'm weighing out to within .02gr. I'm not weight sorting anything. Berger Hybrid 105's, Lapua brass annealed 1-2 firings ago. Whidden FL die and Wilson 6 Dasher seater.
2) By my recollection it wasn't consistent. They just walked around. I remember the 1.792 group started in the middle, then the two off center, and the fourth back in the first hole.
3-4) I know I should be lit on fire for admitting this, but not on the 200y day. Yes the BR guys were set up on the 100y target and I shot on hanging streamers only. There are hanging streamers along the perimeter of our wooded range. In any case winds were between dead calm and very light. On the 200y target the last two groups were shot with me mindfully waiting for dead calm.

On days like this I can shoot twice as tight with my 6PPC-USA Sako with less carefully prepared loads. So it could definitely be the nut behind the trigger, but this nut can shoot better most of the time.

 

[mikeeg02]

With that reply, I would want to see if 1.795 repeats. And play with powder again.

It also has the least vertical. But you might be a little on the hot side.

And pay attention to the streamers.

200y wind changes can be a lot.

 

[mikeeg02]

I’m not seeing any kind of tendencies from group to group, only the one depth that’s obvious, so how could a fella develop a diagnostic tree? It’s like exact or nothing.

What I see is the core of the group at 1.795 and 1.798 are in a similar location and better grouping than the others.

My fear is the node has gotten so narrow, meaning he's at the upper end of the powder charge, which means its likely going to be inconsistent and temperature sensitive. At least thats what I see with the limited information at hand.

Edit: The load I am shooting now doesnt seem to change at 1k from .007" in to .015" in. I havent tried backing them off any more. But so far it hasnt changed.

 

[dmoran]

I concur with Mike: ".... the core of the group at 1.795 and 1.798 are in a similar location and better grouping than the others."
Myself would revisit the powder and also would like to see how it performs at distance (primarily for vertical).

 

[lawman29]

You're jamming hybrids. Try 20 thou off. 1.770?

 

[dmoran]

You're jamming hybrids. Try 20 thou off. 1.770?

World records have been set with 6mm Hybrids seated into the rifling.
More then one way to skin a cat....

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[Poor Shot 65]

I did a load development thread awhile back that turned out quite well, lots of fellas chimed in and had a good time and came up with a very good load.
The exercise was no chronograph just reading the paper.

Can you send me a link to that thread ?

Thanks

Adam

 

[mikeeg02]

World records have been set with 6mm Hybrids seated into the rifling.
More then one way to skin a cat....

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I havent set any records, but my hybrids like to be in a little too.

 

[dmoran]

I havent set any records, but my hybrids like to be in a little too.

Ya.... but your close !.!.!
(PS .... Jim O'Hara and Alex Wheeler are who's records set with Hybrids I'm referring to)

 

[Terry]

1.795 is on a common velocity node.

 

[mikeeg02]

Ya.... but your close !.!.!
(PS .... Jim O'Hara and Alex Wheeler are who's records set with Hybrids I'm referring to)

I just got my new trigger, and its sweet. Maybe that will be what keeps all ten in there together.

I’m looking at the shape of the group, mine if I seat to close to the lands they start a vertical shape if I’m to far out they get erratic. If my seating is right at .018 and the load go vertical it’s a powder spike. So how would you analyze this grouping

The wrong seating depth will not shoot no matter how much powder you put into it. I've chased that for a while before. I dont have a lot of experience with jumping(I'm white and a little too heavy lol!), but if its that sensitive there, push them in the lands ~.005" or .010" and redo your powder test, starting a little lower.

 

[Larry Rizzuto]

I use CCI-450's in my 6 x 47 Lapua. My best load is 37 gr. of H-4350 with a Berger 105.

 

[dgeesaman]

I appreciate the suggestions. I think I’ll go back for another charge ladder using the dry neck lube and 1.795 seating depth.

David

 

[lawman29]

Granted they will shoot jammed, and there has been much success jumped 20-25 thou. But what the op has been doing isn't working. Let's look from the start:

The powder test target done 1.801 (10 jammed) at 100 yards. Look at target and observed mid-point of groups to see if any vertical from one to next. Kinda see from 30.0-30.3-30.6 going up...use your imagination. 30.3 picked for seating test. Op is testing .003 differences in unsorted berger hybrids, with most all of them jammed (1.804 13 jammed, 1.801 10 jammed, 1.798 7 jammed, 1.795 4 jammed, 1.792 1 jammed and 1.789 2 off). Look at targets not for group but what is happening vertically between targets.

I would suggest going back to the beginning with a powder test at 200 yards. 1 shot in 0.2 increments, look at targets for vertical or lack thereof (when you shoot more than one you get hung up on what the group looks like rather than discerning vertical differences). Do the test at 5 jammed, touch (1.791) or jumped 20 or all three

After picking a powder, do your seating test, .005 difference between test loads. Start at 5 jammed and work out to your own desires....

 

[X-Caveman]

The rings and scope passed a box test recently on another rifle. I rechecked the clamp screws are tight (Burris Signature Zee) but I have not checked the pic rail screws to the action.

I would still try a different scope - one that shoots small elsewhere. It's probably not the problem, but everything your doing is wasted if it is. It's an easy thing to try.

 

[lawman29]

Granted you are stuck with 200 yards. Fortunately I am able to test at 500 meters here in Cody (great data for 600 yard mid-range comps, but wish I could test at 1k for the long range comps). Just had a new barrel installed on my Dasher and did a ladder test this morning with a new bullet I'm trying. You will see how much easier it is to discern nodes at distance. I will go back and test 0.1 increments between 34.0-34.4 and 34.6-34.8. Hopefully the lower node works because it's wider.

 

[dgeesaman]

I would still try a different scope - one that shoots small elsewhere. It's probably not the problem, but everything your doing is wasted if it is. It's an easy thing to try.

This Sightron came off of a gun shooting .25 moa pretty consistently.

I could try one of my not-so-great-optics Weaver XR benchrest scopes. They've shot very tight before and are collecting dust at the moment.

 

[Nature Boy]

I havent set any records, but my hybrids like to be in a little too.

Just the tip