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7mm PRC

27 Jun 2022
@ 08:01 pm (GMT)


Hi Everyone

I see the the SAAMI specs have been released for the 7mm PRC, curious to know what the more knowledgeable among you think of them.

From what I can see it's similar to both the Practical and the 7mm LRM, looking for a sweet spot between the 7mm Rem Mag and the 28 Nosler but with two different parent cases. 375 Ruger for the LRM, 300WM for the Practical and 375 Ruger into the 300 PRC - into the 7mm PRC for the new cartridge.




06 Jul 2022
@ 09:28 am (GMT)

Scott Struif

Re: 7mm PRC
Hi Vince. Since the more knowledgeable are at a loss . . . It’s a shortened 300 PRC case invented by Hornady to make people who recently purchased 280AIs kick themselves.
07 Jul 2022
@ 01:31 am (GMT)

Lane Salvato

Re: 7mm PRC
Vince, if you look at where the velocity sits with projectiles of similar weight and sectional density, and assume the same terminal performance then it comes down to a couple of things for me, and it's different for everyone who hunts out west.

The PRC on paper does seem to perform up there with some of the large 7 mags in terms of pushing 180 grain bullets to high velocities. I think that's the question you asked. Personally I like the fact that this cartridge doesn't seem to have a belted case which is a thing for me.

Like the Ruger Compact Magnums, the Winchester Short Magnums, etc. it likely will get the job done. The weakness is that like them components will be hard to find in terms of brass and reloading equipment. Loaded ammunition will be hard to find and expensive.

If you look on most ammo broker sites or go to local stores what you see is that they have just about all consolidated around 30 calibers for large game. 308, 30-06, and 300 Win. Mag. Yes there are certainly others online but they are expensive and you don't get much choice.

I had a chance to use a friend's 28 Nosler last hunting season and it was a pleasure to shoot. Really a laser. But the custom ammo was once again expensive, and very hard to get.

For me it's about being able to practice and reload without a lot of trouble. So for those reasons, on the PRC I would pass.

08 Jul 2022
@ 10:34 am (GMT)

Nathan Foster

Re: 7mm PRC
Hi Vince, sorry for the late reply, I wanted to take some time to go over the numbers.

Unfortunately there are some problems with the numbers Hornady has provided. For example, the minimum chamber length to the end of the throat (point at which the bore becomes .284") is listed as 2.6851". Using cotangent math, this should place the end of the freebore (listed as cylinder) at 2.6851" - .0306" = 2.6545. But instead, the drawing shows a figure of 2.540". This does not make sense, using the formula normally applied for reamer development.

If the OAL to the end of the throat is indeed 2.6851" as Hornady have stated, the COAL on the lands (180gr ELD-M submitted) may be over 3.475" or 88.26mm - much the same as the 7mm Rem Mag, but with a much shorter case, akin to the 7x57. The bullet would leave the case as it engages the lands.

Another issue concerns minimum SAAMI dimensions versus actual production dimensions. If the gun maker sticks to minimum dimensions (e.g. to get the most accuracy from the Ruger Precision platform), the freebore diameter of .2846 may cause problems if using a suppressor, compounded as a result of reamer wear. If the gun maker orders max spec reamers (for the sake of wear), the COAL may be exponentially longer. Hornady could have avoided some of this by reducing the neck diameter by .001" and increasing the FB - the trouble being that few makers understand the the ramifications of suppressor usage.

The factory OAL is listed at 3.340 or 84.84mm max. Assuming the usual .120 jump gun makers aim for, the OAL on the lands may indeed be very long. The factory OAL is of course too long for a short WSM type set up, underutilizes a true long action but will probably be OK for a Tikka - as long as folk don't want to seat close to the lands.

MAP rating is 65,000psi.

Due either to poor information or some misunderstanding on my part, I will refrain from making any further comments about this cartridge. Without a production rifle in hand, all of the above is simply conjecture.


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