6.5 prc ADG brass issues.

Have you got a Hornady headspace comparator? If you do, curious what the shoulder dimension is? If I measure a Go/No Go gauge with mine, I get 1.6355" and 1.6415". New Lapua brass measures 1.637", as does new loaded Hornady factory 143 ELD-X.
 
So i just got back from the range .
minus five.
fed 215 m premium match primer
starting load was 52.5 gr rel 26
ADG brass. 127gr barnes lrx.
results
gun is a custom 24 inch #2 contour benchmark. 1\8 twist on a defiance anti action.
52.5 - 2760 , 2768 , 2763 all in the same hole basically.
53 gr - 2780 2786 2787. .3inch
53.5. 2808 2812 2814. .3 inch
54. 2821 2827 2827. .45
54.3. 2840. 2840 2837. .5.

basically 100fps slower than the barnes manual data maybe up to 200 fps on the higher loads.
it shows 55 gr as max charge here i only made er to 43.3 but there was zero signs of pressure on any of these loads.
would sure be nice to get these up around the 3050 mark but its looking like i would have to exceed barnes max load in order to achieve there 3100fps speed they claim with 55 gr of rel 26.
Ideas?
 
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profesional 111 said:
i bought some new ADG brass for my 6.5 PRC.
Wont chamber in my new custom rifle unless i resize it first .
Is this normal. I have used lots a new brass before in other calibers and never run into this issue.
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something strange happened here. i shot one round off so i would have a dummy round to find out where the lands were.
when i came back home all the new virgin brass fit in my rifle and the bolt closes fine without resizing.
Not sure what happened by firing one round off. gun was brand new never fired?
 
profesional 111 said:
something strange happened here. i shot one round off so i would have a dummy round to find out where the lands were.
when i came back home all the new virgin brass fit in my rifle and the bolt closes fine without resizing.
Not sure what happened by firing one round off. gun was brand new never fired?
Click to expand...

Maybe there was some contamination behind the lugs, on the bolt face, forward of the neck or in the shoulder area.
 
propliner said:
You should be able to push those quite a bit faster.
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i think so . so is it safe to just work up in .3 gr increments to get the desired velocity even if the charge of powder is above max but showing no pressure signs?
Manual sais 55 gr will push the 127 at 3100. but i am only at 2850 roughly at .7 gr below max charge. seams like i would have to go alot more than 55 to get 3100.
these lower velocity loads seam to be very accurate. but i may as well have a creedemoore if this is all i can get safely.

54.3 gr was the last load i tried. no pressure signs. very accurate. 2840fps
55 grain is book max . for 3100 advertised.
 
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You can sometimes go higher than book loads in YOUR rifle and for that powder temperature. Some powders are unstable with temperature changes and a load developed in winter can be dangerous in the summer, or if a cartridge heats up in a hot chamber too long. Many books loads are optimistic or have low maximums for liability reasons.

I've noticed quite a few guys on the 'net are disappointed with the performance of the PRC over the Creedmoor. I think it has to do with powder speed required for the case capacity. The larger case requires a slower powder, but the case just isn't big enough and suffers diminishing returns because if it. In other words, it's not as efficient as the Creedmoor, even with the ideal burn and bullet weight. It's a bit of an underachiever when you compare powder capacities. I think the PRC shines most with heavier bullets and slower powders in longer barrels.
 
New barrels take a number of rounds to speed up, 50 plus or more. I’d slowly keep working up keeping in mind that ADG is tough so it likely won’t show pressure signs as easy as other brass. Keep testing accuracy to see if it starts to open up at higher charges.
 
Barrels will speed up for sure from new. I am around 57 grains RL26 under the 127gr LRX, speed around 3190 fps 24" brl
 
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