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Campfire Ranger
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Campfire Ranger
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Randy NRA Patriot Life Benefactor
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Campfire Ranger
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Campfire Ranger
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If you are serious about looking into the delta’s between 2 cartridges you also have to look at the “chamerbing” (things like how much lead area”...
It’s NOT all in the brass capacity or Neck length.... it’s in the Twist & lead spec’s as well... but those are in the “chambering” side of the equation, NOT the brass side.
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Joined: Jul 2001
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Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
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I have been fooling with both the 6.5 GAP and 6.5 PRC this year quite a bit. One of the more interesting results involved measuring the water capacity of each case with the same 143-grain Hornady ELD-M bullet seated to the "standard" overall cartridge length. In the GAP 4s this was 2.85 inches (to fit in the standard short-action magazine), and in the 6.5 PRC 2.95 inches, the maximum SAAMI overall length.
The H20 capacity in both, using fired Hornady cases, was within a couple 10ths of a grain. While the GAP case body is wider, it's shorter than the PRC's body. According to the laws of interior ballistics, what one will do, the other will as well.
Now, if bullets are seated out another .1 inch in the GAP, it gains 1.3% more case capacity. Since any difference in capacity results in about 1/4 as much difference in potential velocity, given the same pressures and barrel length, this gives the 6.5 GAP about a 10 fps advantage in loads getting around 3000 fps.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Campfire Regular
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Campfire Regular
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could the PRC be built off a WSM action?
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Campfire Tracker
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Campfire Tracker
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could the PRC be built off a WSM action? Yes.
Luck....is the residue of design...
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Campfire Tracker
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Impressive shooting for sure. Never knew it got dead calm in your part of the world. But the big question is have you got a leather cheekpiece designed for the EH1 yet? I know it would shoot better..... I need about 40 hours in a day instead of 24....;)
Luck....is the residue of design...
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Joined: Oct 2007
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Campfire Regular
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Campfire Regular
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I need about 40 hours in a day instead of 24....;)
Well, you clearly don't need to spend any extra time shooting. I think you have got that down.
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Campfire Regular
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Pat, are you running H1000 or R26?
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Campfire Tracker
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Campfire Tracker
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Can a 6.5 PRC be built off of a WSM action?
Yes,it can,but it's a good idea to make sure your WSM has enough magazine length. The WSM actions that work without modification include The Winchester M70,the KImber 8400 and the Montana Rifle Company action.
Remington WSM actions and clones need a magazine box to work. Not sure about others,Pat and Mule Deer may know more about other suitable actions.
Last edited by ruraldoc; 09/26/18.
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Joined: Dec 2007
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Campfire Ranger
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Campfire Ranger
Joined: Dec 2007
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The WSM case is .555" at the web, the SAUM's are .550", and the PRC is .532", I'm going to say, as for 700 actions, you need to start with a regular magnum action to feed the PRC from a BDL bottom metal set up, as will a WSM/SAUM needs to begin with the larger action or open up the feed rails to accommodate the bigger cases.
Detachable bottom metal changes things though.......
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Campfire Tracker
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In the case of a M700,the PRC will not work from the regular BDL/ADL magazine set up. The overall length is about 0.1 inch too short. You must change to an aftermarket magazine box to use the longer PRC cartridge. Once you do that,the M700 Short Mag action should work fine.
I think that Mule Deer mentioned in another thread that he was planning on doing that very thing.
Last edited by ruraldoc; 09/26/18.
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Campfire Tracker
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What powder do you'all recommend for the PRC, I have found R-26 gets a little pumped up in the heat of S. Texas, in my 6MMs ? Rio7
Last edited by RIO7; 09/26/18.
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Campfire Ranger
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Campfire Ranger
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Campfire Tracker
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aalf, I have noticed in the 6mms H-1000 is really slow, I have H-1000 I will give it a go, what's your take on Retumbo? it works great in my 6s. Rio7
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Joined: Dec 2007
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Campfire Ranger
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Campfire Ranger
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I like Retumbo, but have never used it in "smaller" cartridges.
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Campfire Tracker
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Impressive shooting for sure. Never knew it got dead calm in your part of the world. But the big question is have you got a leather cheekpiece designed for the EH1 yet? I know it would shoot better..... I need about 40 hours in a day instead of 24....;) Pat, why don’t you make a short mag cartridge carrier while you’re at it!
I probably hit more elk with a pickup than you have with a rifle. I have yet to see anyone claim Leupold has never had to fix an optic. I know I have sent a few back. 2 MK 6s, a VX-6, and 3 VX-111s.
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Campfire Tracker
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Just rolled in from another "field session" Early on it was mostly calm, and 37F. That was short lived. A strong headwind from the northwest came up after 1/2 hour or so. There was a "push", right/left, no mirage.... First ten shots...I wanted to see how it would do when it got hot, and I wasn't disappointed. After letting it cool, I fired these two at the next plate after adjusting up 6/10ths.... More to come....
Luck....is the residue of design...
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Joined: Oct 2009
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Campfire Tracker
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Campfire Tracker
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Next, I went to 895 meters. By now it was blowing pretty good. I really wanted a first round hit on this one. I put in 5.8 mils, held off 8/10ths, and made my first round hit. Next two, I held 9/10ths....grinning from ear to ear....;) The barrel now has 351 rounds through it. Should be stable now.
Luck....is the residue of design...
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Campfire Tracker
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Campfire Tracker
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As an interesting footnote, I'd cleaned the barrel at 75 rounds, so it hadn't been cleaned in 276 rounds. I started with a wet patch, soaked with Butch's Bore Shine, made five passes with a 6.5 bronze brush, two clean patches, two more soaked patches, then a couple dry ones....zero copper, and not much powder... Bartlein barrels are pretty good...;)
Luck....is the residue of design...
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