Velocity Reallity Check

[Dean]

I just started load development on my new 6BR.

Its a 24" Pac-Nor 13.25" twist.

I am using 68gr Berger's and Varget.

All that I have read told me that 34.2gr of Varget is the standard for this bullet weight so I started at 32.1gr and worked up to 34.2 in .3 increments.

My question is ...are my velocity's real or is my chrony messed up?

The most accurate load was 33.9gr of Varget but it produced a velocity of 3420fps.The standard 34.2 was 3435fps.My starting load of 32.1 was 3250.

I have a col of 2.145,this is a .010" jam.

Do these speeds sound about right,is my chrony messed up or do I have a fast barrel,maybe a hot lot of Varget?

I didn't think I would be going over 3350fps.
This load is strictly for paper punching.

Any thoughts?

Dean

 

[tightneck]

I don't know what kind of cronograph you have but I don't think these velocities are abnormal at all. So many variables that its hard to say what kind of speeds you might see. I wouldn't be at all surprized to see much greater velocoties actually, it just depends. I've pushed 68's into the 3500's with a PPC using quite a bit less powder in a 21.5" barrel.

 

[Cheechako]

Dean

Tightneck is right. A BR, 68 grain bullets, and a 24 inch barrel should get you in the 3500 fps range and higher. I too shoot a 6PPC, with 71 grain bullets, at 3350 and it's not the top load by any means. In another PPC I shoot the 60 grain Berger MEF at 3550.

If you still have doubts, ask to shoot your loads across your buddy's chronograph. That should ease your mind.

Ray