Ladder Test Results

[rustyinbend]

Seems like great data from today's 6.5 Creedmoor Ladder Test.

Tikka T3x TAC A1
Berger 140gr Hybrid Target bullets
Hornady once-fired brass
Winchester StaBall 6.5 powder

My question is ... "What do I do next?" ... based upon this data. Seems like I should load 5-rounds at 42.6, 42.8, and 43.0 ... and see which gives me the smallest ES and SD.

Am I thinking about this correctly?

 

[spife7980]

You shoot it on paper

 

[TheOfficeT-Rex]

Did you hit pressure? Because that seems very slow. I'm also suspicious of a "flat spot" that's over a grain wide.


ETA: If you intend to run it that slow, I'd work the 43 to 43,4 range.

 

[NiteQwill]

It's your goal to shoot less than 2700 fps from a 6.5??

 

[TheOfficeT-Rex]

We are a real helpful bunch, aren’t we?

We're no accurateshooter, but we help in our own "special" way...

 

[leclairk]

Your velocities don’t add up. If those are each 1 shot I would rerun the entire series with 3 shot groups to get an average velocity that’s more accurate.

 

[rustyinbend]

No ... no signs of pressure.
Yes ... one shot at each charge weight.
Also tested ladders with different bullet (Hornady 147gr ELD-M) and less neck tension (.291) and the groups for those showed less consistency ... more of an upward jagged line vs. displaying a flat spot.

I'm kinda with the guy that says "Accuracy is better than Velocity" ... so I think next I'll go with my gut and load up 5-round groups and shoot the "flat spot" ... and see what happens.

I'll also load up a ladder test that targets the high end of this and search for early pressure signs ... and see if I can get a flat spot on the high end.

 

[R0man]

My TAC factory barrel is also quite slow. Maybe 30fps faster than yours.
I would check 42.6-43 with 5 rounds