Load Development w/ Masterpiece Arms 6.5 Creedmoor

[LVLAaron]

    40.6g H4350
    Stats - Average    2693.68
    Stats - Highest    2711.54
    Stats - Lowest    2668.51
    Stats - Ext. Spread    43.03
    Stats - Std. Dev    18.53
 
    40.9g H4350
    Stats - Average    2724.56
    Stats - Highest    2739.03
    Stats - Lowest    2713.53
    Stats - Ext. Spread    25.5
    Stats - Std. Dev    10.89
 
    41.2g H4350
    Stats - Average    2751.44
    Stats - Highest    2760.71
    Stats - Lowest    2741.33
    Stats - Ext. Spread    19.38
    Stats - Std. Dev    9.36
 
    41.5g H4350
    Stats - Average    2764.78
    Stats - Highest    2779.69
    Stats - Lowest    2750.48
    Stats - Ext. Spread    29.21
    Stats - Std. Dev    10.84
 
    41.8g H4350
    Stats - Average    2780.88
    Stats - Highest    2790.69
    Stats - Lowest    2770.67
    Stats - Ext. Spread    20.02
    Stats - Std. Dev    7.09
 
    42.1g H4350
    Stats - Average    2796.34
    Stats - Highest    2805.68
    Stats - Lowest    2786.44
    Stats - Ext. Spread    19.25
    Stats - Std. Dev    8.25



    H4350
    Lapua Brass
    CCI-450 Primers
    Hornady 140 ELD Match
    Seated @ 2.80 OAL

The rig: https://imgur.com/k7lC4IU

The target: https://imgur.com/BXxuKw9

The brass: https://imgur.com/uWtD8bN


Pretty happy with the first and last groups. Especially the last group at ~2800 FPS. Third group (top to bottom) might have been me getting uncomfortable in the cold and it being windy. Either way, happy with my first shots out of this gun

 

[walker2713]

Very interesting.....thanks for posting. I just bought Tikka T3X in 6.5CM, and plan to load some Hornady 143 ELDs.

 

[Texas10]

At that COAL, are you into or off the lands?

 

[LVLAaron]

At that COAL, are you into or off the lands?

I usually measure and use the comparator tools, but skipped it on this gun and just loaded them to mag length 2.800" since it's throated for Hornady 140's - I figured I'd start here and see how it did before I started monkeying with seating depth. It's definitely off the lands.

 

[Bart B.]

Looks to me like all those groups could have been fired with any one of the listed loads.

It's statistically normal for 5-shot groups to have a 3X spread in size from smallest to largest. Shoot 3 or 4 five-shot groups with the load that made the bottom (last?) one to see what happens.

 

[dmoran]

It's statistically normal for 5-shot groups to have a 3X spread in size from smallest to largest.

Would like to see these statistics your referring to.

 

[Bart B.]

Would like to see these statistics your referring to.

There are several on line to learn from. Search, find, evaluate then review to form your own conclusions. Or review what you mentioned earlier obtained from match results.

Then you may have someone else to disagree with.

 

[dmoran]

There are several on line to learn from. Search, find, evaluate then review to form your own conclusions.

Then you may have someone else to disagree with.

Thank you... that answers the question well, and as expected.

 

[LVLAaron]

Looks to me like all those groups could have been fired with any one of the listed loads.

It's statistically normal for 5-shot groups to have a 3X spread in size from smallest to largest. Shoot 3 or 4 five-shot groups with the load that made the bottom (last?) one to see what happens.

I have and I will again. I just haven't recorded it all and posted it for the satisfaction of internet points.

 

[Wjesswheel]

didn’t see a yardage on your post is that 200 or 300 yards