EC Tuner Testing 6 Dasher PRC rifle in 110 degree heat

[Jerry Snyder]

Man, hot one today. First off, I appreciate the assistance Mister Cortina provided in making me a 3d printed wrench for the Cortina V2 tuner I purchased. It worked great with my 70 year old arthritis ridden hands. Shooting at 100 yards on a Caldwell front rest, and a rear bag. 6 Dasher Bartlein barrel, MTU contour, Defiance Ruckus action, Manners Stock, trigger tech diamond trigger. The Manners stock did not fit great in the front rest. I ordered a SEB Mini X, but it might be a bit before it comes.... Started at 07:00 AM at Ben Avery Shooting Complex in Phoenix. Load is 31.8 of Varget, CCI 450 primers, Alpha brass, Berger 105 hybrids, loaded out to 1.935 BTO. I circled a few of the better groups.

I ran 20 - three shot groups, waiting 2 minutes between each 3 shot group to let the barrel cool a little. and about 10 minutes after each 9 round session ( 3 groups of 3). Barrel temp hovered about 110 to 120. I used a chamber chiller after each 9 rounds. I still have some additional turns to go on the tuner, meaning I have not yet bottomed it out.

Attached is the target, and a simple spreadsheet with data for each of the three shot groups. First group was high, so I adjusted the scope down a bit. Second group was a little low, so up a click. What advise would you give to a beginner based on the info provided. I am open minded to constructive criticism to load, equipment, technique etc... My expectations are to 1. Have fun 2. Try to improved the little things before they become big things. Thanks all.

 

[Bill Norris]

I think the dasher may want a tad more go juice. The 6BRX has a very close powder capacity as the previous one and the one I now own wanted to get up about mid-32 gr. range to give best groups. What I would look for would be a pattern or a set of groups of two or three that were at the same POI and tight.

 

[JFrank]

I would go back to the first group tuner setting and go up about 3% in powder testing both sides of 32.7 ish (~ 32.4 -32.6-32.8 ) I think it will come together nicely.

 

[LCazador]

Try making scope adjustments before you start any test then shoot a few shots to let scope settle. I'm with moving the powder charge up a bit and start tuner test again. I'd play around a bit with bullet tension, powder charge, and seating depth before starting tuner test.

 

[ogre1911]

+4 on adding powder/horsepower. The Dasher I have that likes 105 hybrids likes 32.6 of either Varget or N150, they are interchangeable. Average speed is about 3026 fps.

I shoot in the same or worse heat as Ben Avery, about 2&1/2 hrs southwest of there.