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30-6.5PRC for 1000yd BR

I have started working with a 30-6.5PRC and thought I would share some of what it can do. It is a 6.5 PRC necked up to a 30 cal, and I have been interested in it mostly because it is right at the same capacity as a 30-06: 70gns of H2O. This holds a nostalgic place in my heart because I got started shooting a 30-06 with 190gn SMK at 600 yards back in the 90s. I intend to focus on 200 up to 230gn bullets and the goal is to use it for 1000yd BR.

For those who may not have seen my other posts, I test and tune out in the open prairie - the national grasslands in the northeast corner of Colorado. It's a peaceful place and I find my trips rejuvenating. Since you're not allowed to drive off the roads, I have to walk my target out and this means that most of the results you see will be at somewhat odd distances. Here's what my setup looks like lately:
IMG_5299.jpeg
Just to the right of the umbrella in the distance, you can see a white square. This is a 48"x48" target, in this picture set up at 786 yds, by the GPS measurement on my phone. Just for fun, here is another spot that I shoot:
IMG_5237(1).jpeg
Same target at 600yds and you can prominently see one of my 4ft sticks of #3 rebar, painted red, with surveyors tape. This works pretty good and is high visibility in the scope at distance.

Alright, into the meat of it! Here's my BR family of favorites right now:
IMG_5150.jpeg
Left to Right: 20 Vartarg shooting a 55gn Berger at 3150fps, 22 PPC shooting a 90gn SMK at 2930fps, 6.5x47 shooting a 144gn Berger at 2760fps, and the 30-6.5PRC (named by it's inventor the 30 Prick) shooting a 220gn Berger at 2730fps.
IMG_5246.jpeg
The chamber has a 0.338 neck. When you neck up Lapua 6.5 PRC, we end up at a loaded round of .341 or so and this was set up for a light turn to clean things up. A word of warning: the original shoulder-neck junction gets pushed into the neck and creates a horrendous donut. You have to set up your freebore to stay above that donut, because I have had no luck turning it down or reaming it out sufficiently to have the seating feel I prefer.
 
For those who are curious, here is a custom 201gn bullet next to a 220gn Berger LRHT:IMG_5241.jpeg
And a 220 LRHT next to a 230gn Hybrid:
IMG_5242.jpeg
It's pretty interesting - these big 30 caliber bullets are really long.

Alright, getting into some results below, I have a mix of powders and bullets and I am largely doing one of two things:
  1. A "ladder" of ascending powder charges, looking for stable point of impact on the target. I am not looking at speeds, beyond noting them for interest.
  2. A seating depth test where I am investigating small depth changes. I start at about 0.020" into the lands, which is where the bolt will close smoothly without drag and bullets don't stick in the lands.
Everything is shot in a Bartlein 10.25-10 gain twist, 30" barrel. First up, some targets with the 215gn Hybrid
IMG_5309.jpeg
This bullet is easy going and produces great results.
 
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The 230gn Hybrid is too big to fit above the donut, and I have to use virgin brass, where the donut has been cut and minimized enough to seat them down in the case.
IMG_5306.jpeg
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I don't plan to do anything with the 230gn after I fireform virgin cases with the 100 I bought to try. The 220gn LRHT fits much better, and has been an excellent performer:
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IMG_5307.jpeg
 
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Very well thought out design, other than the dreaded donut. That devil is why I have gone with the 300NMI design.

Did you consider a 30-284? Necking up would have no donut.
Again, good design.
 
Very well thought out design, other than the dreaded donut. That devil is why I have gone with the 300NMI design.

Did you consider a 30-284? Necking up would have no donut.
Again, good design.
I wanted a stronger case head. I did consider the 284, but wasn’t as drawn to it with the rebated rim and I suspect that availability will dwindle with the 7 PRCW taking over F-open. Also, I came across this setup secondhand and didn’t spec it myself. Truth told, I would have gone with a no-turn neck of 0.345 and a longer freebore for the 220 and 230gn bullets.
 

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