7prc > 7rm ??

quandary said:
First of all this has nothing to do with 7PRC or 7RM or 30-06 or whatever other cartridge you care to name. Its Hornady's claimed velocity numbers on the factory ammunition. For example in my 6.5 Creedmore (I haven't bothered with dies for this caliber) with a 24" barrel I get an average of 2,610 shooting 140 ELDMs, the box claims 2,710. Further the swings in velocity are unbelievable going from below 2,600 to as high as 2,690. On the other hand shooting 144 Berger LRHTs I get and average of 2,725 the box claims 2,830. However Berger use 26" barrels for their stated velocities (Hornady uses the industry standard 24" I believe). So my velocity tracks with the Berger claims. Additionally the swing in the Bergers is around 30fps. This has got nothing to do with the hype around the 6.5 Creedmore. It has to do with Hornady doesn't produce particularly good ammunition. It underperforms claims and its inconsistent.

Second, the 7PRC was not developed and doesn't claim to be faster than the 7RM. In fact the 7RM's case capacity is slightly larger than the 7PRC case capacity so if anything the 7RM should be faster than the 7PRC. The goal of the 7PRC design and specs is to be a more accurate factory SAAMI spec'd caliber that is capable of using longer, higher BC bullets in a retail rifle. This goal was achieved. Built to SAAMI specs the chamber tolerances are tighter, the COAL is longer, the twist rate is tighter. It is a more accurate round particularly at distance. Additionally because of the high BC bullets that can be used it is faster down range and less effected by wind. Thus flatter shooting with less drift, more accurate. These are undeniable facts. The design of the 7PRC has nothing to do with creating faster muzzle velocity.

That said inside of 500 or 600 yards there will be a virtually no difference. Further given the nearly identical case capacity there is no question that anybody could have a barrel cut with tight tolerances and a 1/8 twist and achieve 7PRC performance. The point of the 7PRC is to enable the average Joe to go to the local Cabelas or Sportsmen's Warehouse and buy a rifle off the shelve and be good to go. That goal was achieved.
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Nonsense. I never stated that the 7PRC was claimed to be faster than a 7RM.
Also, this has EVERYTHING to do with CLAIMED velocity on the box.
If you believe that ANY of these PRC cases are a BETTER design, and have TIGHTER SAAMI spec, then you are delusional…
One of the most accurate LR cartridges for many years, and still is, is the 300WM, oops, it has a belt…

Cheers.
 
redneckbmxer24 said:
Cool story, what about my rifle that is a new barrel getting what you'd expect with a 2" shorter barrel than test length with typical velocity losses per inch?
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You claim cheap rifles get lower than advertised velocities, that's not the case. Has nothing to do with your personal rifle or shorter whatever. Not a story , it's a quote.
 
MostlyUselessLurker said:
Would you mind sharing that video link? Hornady box ammo 175ELD-X 7mm PRC says 3000 fps, not 2800. There are plenty of videos showing less than claimed velocities but 2600-2700 from a 24" barrel is unbelievable.
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Word on the street is factory ammo for the 7prc they changed from the original powder to a powder that can't produce the advertised velocity. No change to box velocity due to little pee pee syndrome shame from the 7 rem mag and the consumer apparently won't notice because hunters aren't precision shooters🤔 As I said word on the street so take it as you may.
 
river rat23 said:
Hello all. I'm always buying / selling / trading gear & rifles. Always interested in trying something new to tinker. As the rest of you surely have , I now hear constant talk about 7prc being the latest & greatest. I started to do some research to find out for myself. I just can't nail down why a 7prc would in any way really provide a better rifle than 1 of my current 7rm rifles. I'm shooting hornady eldxs and berger vlds. 1 recipe is 168gr berger vld @ 3,094fps av. Have had good luck getting sub moa av groups with both rifles. Someone educate me on what 7prc would do better ? Why are people raging about this 7prc stuff? Thanks in advance for the education. Always cool to hear the wizards come out of the woodwork on here. Cheers
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MagnumManiac said:
Only advantage, theoretically, is the 8" twist standard on factory rifles.
I watched Whoteewho shoot his, and the lacklustre velocity of the factory ammo was a huge negative for me. As I said in another thread, 2800fps, and that is NOT what the Hornady match ammo with a 175g ELD-X was doing, the box said that, but it was 26xx something. Is a huge turnoff for me. I'll stick with the 7-08 on the slow accurate end, and the STW for top end speed.

Cheers.
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Those things written on the factory boxes are from long barrels that are not factory guns making that top end muzzel velocity best case. I shoot a 7mm stw that's a longer case than that PRC. I've never shot it through a chrono but the charges in the upper 70s and I'm shooting 165gr A-tips to 168gr that's supposed to be over the 3k range. Model 700 with 26" factory barrel in 1-9 twist. I'd like to have a 1-8 though
 
MagnumManiac said:
Nonsense. I never stated that the 7PRC was claimed to be faster than a 7RM.
Also, this has EVERYTHING to do with CLAIMED velocity on the box.
If you believe that ANY of these PRC cases are a BETTER design, and have TIGHTER SAAMI spec, then you are delusional…
One of the most accurate LR cartridges for many years, and still is, is the 300WM, oops, it has a belt…

Cheers.
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Sorry you are dead wrong. Do some research and get back to me. Also I referenced SAAMI specs on chambers. This is a perfect example of why the internet can be a dangerous place to get information unless you actually verify for yourself.
 
I do not understand the hatred that gets flung at new cartridges. If we stopped innovating and trying to improve things we wouldn't be Americans. I love the 7mm rem mag and have built more of them than probably any other caliber. My taxidermist has made a small fortune, and my protein supply has never dwindled thanks in large part to the 7mm rem mag. I've shot a plethora of big sevens like the 7mm stw, 7 rum, 28 nosler, 7-300 wby and had great success in the field with them but I always came back to the good old 7mm rem mag. I've spent the last year and a half with the 7mm prc and I don't think I'll be going back to the rem mag anytime soon. I'm not sure what's wrong with the factory ammo or maybe I just got an early lot but I'm getting 3050 with factory 175 eldx loads and a 24 inch barrel. Recoil impulse is lighter, the case design allows the rounds to feed a little better from a magazine, the Sammi chamber spec for it leaves plenty of room in the throat for running long heavy bullets. Nothing wrong with the good ol 7mm rem mag, and I have zero problem with anyone not seeing enough benefit to add a 7 prc to the stable. More components for me, cheers.
 
quandary said:
Sorry you are dead wrong. Do some research and get back to me. Also I referenced SAAMI specs on chambers. This is a perfect example of why the internet can be a dangerous place to get information unless you actually verify for yourself.
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As I said word on the street, I didn't say 7 rem mag was faster either, that's your assumption. I'm saying factory as printed on the box 3k fps and only achieved 2800fps on average. I have 300 wm and 7 rm. Hand loads I'm sure you can get more velocity. It doesn't bother me if you get your velocities or not. Why would I need to look at saami spec. Never said it wasn't accurate, secret it's a precision rifle cartridge. Read what I said, don't jump to conclusions. Keep your hair on and have a great day.
 
Had a custom 7RM that didn't perform the way I wanted, so I rebarreled to a 300WM and have loved it. Built a 7PRC (24" barrel} knowing full well what I could expect performance wise. 3 boxes of factory 175 ELDX to break in barrel verified drops at 2950FPS. Handloads with 175 Bergers shoot to literally the same POI out to 1000. I didn't build a rifle to shoot factory ammo. I'm a little surprised at the number of people on a long range forum that are relying on factory ammo. I get it, but the only way would be to purchase enough ammo of the same lot to shoot until your barrel was toast. And if you don't like the results you get from factory ammo, then now is the time to start reloading. I enjoy the process of finding a good load and the pride of using it to kill something. We are kinda getting to where we want an easy button that I can just buy results in a box and if it doesn't work then I'm going to complain. To be clear I never bought into the Hornady hype, but I am getting exactly what I expected. I had a long talk with my gunsmith because mine was the first he built. I told him that people were going to be beating down his door to build one or rebarrel a 7RM mag to PRC. I told him exactly what the PRC would do and when people wanted one he made sure they were very clear what they were getting. I knew people were thinking they were going to get something that was going to run circles around a 7RM and I didn't want them coming back to him and complaining. A few clients decided to stay with the 7RM or go a different route. The ones who went ahead with the PRC have been happy. Oh, yeah I'm a rebel because I only went with a 1in 9" barrel because I will never shoot heavier then a 175grn bullet. I believe the lack in velocity we're seeing with the Hornady ammo is they have changed powder at least three times now. I pulled a bullet from a factory round and my buddy did the same and they were two totally different powders. I'm not an expert so I couldn't begin to tell you what powders were in there. Just another reason to handload, then you know what is going in. Apologies if anything I said is offensive. I'm not trying to be or judge. I try to help and support others. Most of my friends shoot factory ammo and it's good enough for what they do.
 
river rat23 said:
Hello all. I'm always buying / selling / trading gear & rifles. Always interested in trying something new to tinker. As the rest of you surely have , I now hear constant talk about 7prc being the latest & greatest. I started to do some research to find out for myself. I just can't nail down why a 7prc would in any way really provide a better rifle than 1 of my current 7rm rifles. I'm shooting hornady eldxs and berger vlds. 1 recipe is 168gr berger vld @ 3,094fps av. Have had good luck getting sub moa av groups with both rifles. Someone educate me on what 7prc would do better ? Why are people raging about this 7prc stuff? Thanks in advance for the education. Always cool to hear the wizards come out of the woodwork on here. Cheers
Click to expand...
Same reason they rave about the needsmore. I'll take my 280 Ackley over one.
 

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