Pulled the trigger on a new 6xc CBI barrel yesterday, 7 twist. Anyone shooting this twist with 105, 108 grs and if so what is your best load data.

[koger]

I have ordered a new CBI 26" Varmint taper 7 twist. I ordered a new barrel for myself yesterday since I opened my mouth and sold my 8 twist Savage 110 build 6xc. It will be put on a Savage 110 or Axis Precision, both with actions trued up on the face of the receiver. I have several 105-108 gr bullets of all makes, and would prefer to focus on them, also have about 300 115 grs, that shot great with D Tubbs loads of H4350 or Varget, and I know they should shoot good in this 7 twist, since they shot great in the 7.5 twist I put together for other folks. I have a large selection of powders, Rel, 15, 17 19, H 4350, Varget, H 335, H4895, Imr 4350, H4831, IMR 3031, BlC-2. All data with the 105, 107, 108 gr bullets would be appreciated with any of these powders. I have also had great luck with Rel 15 in this caliber in the past.

 

[Precisionhunter417]

Is the cbi barrel a 4 land or a 5R? Twist rates like 7 with high speed can cause jacket failure at max pressures.

I have loved the 105-108 grain bullets under H4350. 38-40.5 grains is my recommendation.

115 DTACS work well with 37-39g H4350 too.

Been working on a powder replacement similar to H4350 but at a better price point as 60/lb is getting steep.

 

[EdHarley]

The 107SMK shot very well for me with RL 16 at ~39gns. The 115DTAC shoot lights out with nearly the same powder charge.

 

[STOMP442]

I have the exact barrel except with 7.5 twist. I have great results with 107 Sierras with H4350, R16 and N560. N560 is giving me 3116 fps and shooting in the .3s consistently. Peterson SR brass CCI 450s and somewhere around a grain under max load.

 

[koger]

Thanks guys. Anyone using R15?

 

[LBEdgin]

Mine is a 1-7/5 twist, the H4350 never preformed as others reported for me. I used IMR4831 & RL19 with good results but also tried VihtaVuori N-160 with very good results with 107gr Seirra MK, 105gr Lapua, Berger hybrid 105gr and Berger 108gr Elite hunters. Of the bullets listed the Sierra 107gr & Lapua 105gr shot the best but the gap is small between all of these bullets. Again my 6xc shoots a lot of different powders good, but the N-160 shot the best.

 

[koger]

LB pm sent

 

[majohnson]

My 6XC 26” 6 grove 7.5 twist installed on an AI AE MK III action and chassis. With 17 HV barrel profile, loading with RL17 and Berger 105, 107, 108. It a rock solid out to 1050yds. The 108 Bergers showed great potential.

 

[Greg Y]

I built a 7 twist 4 groove Mullerworks to shoot the hornady tap bullets they were giving away and be able to use srp in the process as I have a zillion of them.

Mine shoots 39.5grs of h4350 into the .4's more often than not at 3050fps from a 26" tube.

I've never tried anything else.

 

[Fast14riot]

If you got this from NSS, what is their current lead time? I'm considering ordering a barrel this week from them.

 

[koger]

If you got this from NSS, what is their current lead time? I'm considering ordering a barrel this week from them.

Got my barrel in 5 days.