6mm BR and 107 smk load - load - seating - inexperience question!

[chrismc]

I have been loading for this cartridge for a year now - have shot some crazy crazy groups with 29 and a bit of Varget with a 107 smk, prepped Lap brass, wolf primer, 272 no-turn reamer, concentricity 2 thou or less, Benchmark #8 contour barrel... however, these groups are not as consistent as I would like, and i tend to get 2-1 groups more often than not.
I tried everything from 20 jam to 30 jump in 10 thou increments - sweet spot was initially 10 jam, but after 100 or so rounds, with the barrel broken in, i tried again and found 10 jump was the place to be - but still 2 thru same hole, one shot usually 1/2" away (200yds)
My question is, why would the 10 jam change to 10 jump - barrel break-in?? Then addressing the 2-1 groups - makes me think i haven't found the right seat depth yet, and should try finer increments? Different powder/bullet/primer?
I hope to get some 105 hybrids and try those next - if same issue, then try H4895, and then cci450's. Sound like the right plan of attack? any further suggestions on something I may be missing? It may be my technique, but want to rule out load stuff first.
Maybe I am chasing ghosts?
Load development was both ladder and OCW - results both agreed on the load.
Thanks for the tips!

 

[No Fear in Accuracy]

My gun equipment is:

Trued Rem 700P
Krieger Heavy Varmint 28"
Twist rate: 1:7.5"

Load: Varget 31.2gr
Bullet: 105gr Berger Hybrid Target
Primer: BR-4
Jam or Jump: Jam into the barrel.
It shoots ragged hole many times.

That's what my rifle likes.
Hope it helps.

 

[b72471]

6BR Great caliber. If your groups are .5" at 200m, that's not bad. Varget is a good powder for 6BR, wolf primer or standard primers will work fine. If the jump and jam is changing it may be you (technique perhaps may need some work). BULLET, I like the Berger 105 VLD for short distances the Hybrids are not needed , out to say 500m. I find a larger group tells a better story (5). If you can leave the first target on the board for the day and overlap it with the fresh targets for each group; end of the day that target will tell you a better story than 3 shot groups. This is where a crony comes in velocity changes can make a difference.
Enjoy

 

[chrismc]

Yes, am working on technique - but can shoot other rifles to consistent results, just not this one. I will add that the 1/2" 200 are what the gun is capable of or even better, have even done (i assume an educated fluke) 1/2" at 300, but NONE of those small groups are consistent - its the 2-1 thats driving me bonkers! Sometimes its a vertical 2-1, other times horizontal 2-1. POI is the same place with all groups, and will try 5 shot groups in the future, but want to figure out this flyer (?) thing first before wasting rounds. All testing is at 200.
Its looking like i will continue to perfect technique with this rifle then try minor load component changes until it all gets consistent. Been using the inexpensive shooting crony, but the more i use it, the more i see the value in a better unit. Placed 20ft down from muzzle, the velocity is all over the place so i stopped using it. I even took 1250fps 22 LR and got anywhere from 1150 to 1300 fps, same gun, same day. 6 br gave me 2700 - 2900, which i don't believe the fluctuation - in either 22lr or 6 br .
I think my OCD is getting the best of me...