Thread: Is the new 7mm PRC a lemon ?

Originally Posted by hunterzk

I’m shooting a 7prc. ..I’m seeing 2970 sd 5 es 7. ..

Surely that's a typo? With an SD of 5, the ES has got to be bigger than 7. You don't mean 17? That's assuming say 10 shots in the sample.

@gimp ^ getting down to 3 decimal place measurements. Can only assume this degree of accuracy was calculated from 30x 5 round groups.
@hunterzk just kidding mate, sounds like an awesome setup

Originally Posted by PerazziSC3

@gimp ^ getting down to 3 decimal place measurements. Can only assume this degree of accuracy was calculated from 30x 5 round groups.
@hunterzk just kidding mate, sounds like an awesome setup

Phenomenal!

Originally Posted by PerazziSC3

@gimp ^ getting down to 3 decimal place measurements. Can only assume this degree of accuracy was calculated from 30x 5 round groups.
@hunterzk just kidding mate, sounds like an awesome setup

Haha it probably took 50 rounds of playing with different powders & charge load then seating depth. That’s just the numbers from ballistic-x app. Easy way to measure group size

I enjoy squeezing my lemon….



300m

Makes you fall right out of bed

Greg Duley has a good article about all of this in the latest NZHunter mag.

I just pulled out some numbers comparing a few of the big 7s.



So we have:
7mm PRC has 50 thou longer COAL than 7mm Rem Mag - probably not a big deal. It's the same as the 28 Nosler and the 30-06 / 270.
7mm PRC has Rim = Base diameter. Rem Mag has a 19 thou belt and 28 Nosler is actually rebated 15 thou.
7mm PRC has the shortest powder chamber and 28 Nosler has the biggest.
7mm PRC has a body taper of 14 thou, Rem Mag is 22 and the Nosler is also 22 thou. The PRC could potentially be a little rougher to feed.
7mm PRC has the longest neck at 287 thou, about 1 bullet diameter. 300 Win Mag is said to be a bit short at 264 thou and the 300 PRC is 308 thou, arguably better.

Originally Posted by Tahr

Greg Duley has a good article about all of this in the latest NZHunter mag.

April May issue???

Originally Posted by Micky Duck

April May issue???

Just out the last few days. The article explains, clarifies or corrects just about every statement and question on here about the 7mm prc so far.

Originally Posted by Tahr

Just out the last few days. The article explains, clarifies or corrects just about every statement and question on here about the 7mm prc so far.

Some good info but few things they absolutely do not clarifies or correct:
-the first Hornady batches were loaded way too hot, nothing to do with how clean people clean their bore and variability in custom rifle chambering, this bit of writing sounds like a copy and past of Hornady marketing BS...
-then they got 6 firing of one same Hornady case and this seems enough of a test for them to disregard online reports about Hornady 7prc brass issues. It just shows how inconsistent Hornady brass is, some/a few brass I used were fine with 6 firing, others/most were blowing primer at the third reload.

Originally Posted by Tahr

Just out the last few days. The article explains, clarifies or corrects just about every statement and question on here about the 7mm prc so far.

You also have to be aware that Hornady is a major sponsor of Nz Hunter.
Those have had anything to with magazine tech/gear reports will be aware that even if something is a turd no one will say it.
Need to be clear this is not a go at the Duleys they do more good for nz hunting than anyone else

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Originally Posted by Tahr

Just out the last few days. The article explains, clarifies or corrects just about every statement and question on here about the 7mm prc so far.

Thanks for alerting us to that tahr.
Greg Duley is good at a lot of things and writing about big 7mms is certainly one of them.
That article is a good run down on the similar cartridges and the technical reasons for the 7mm PRC design and chamber/barrel specs.
So far he has only reported on a quick test of factory ammo in one factory rifle.
Like others, I was a bit unimpressed with a case failing after only 6 reloads (having got 15 so far from my 7mm08 and still going strong).

He promises to explore reloading potential in a couple of future articles.

I came across an interesting post on the Sako.global web site (search for: " 65-creedmoor-vs-65-prc-hunting " ).
Sako's advice is that the 6.5 Creedmore is very easy to find a good load for, while the 6.5 PRC does have good potential but is difficult.
I wonder if this is what we'll see with the 7mm PRC ?

At present, the 7mm PRC is largely the province of custom rifle builds and Hornady factory ammo brass, so we can expect erratic performance, sometimes stellar and sometimes random. I see a lot of advantage in a factory rifle.
Once there is a Sako 90 Peak in 7mm PRC and Lapua brass, I'll strongly consider it. For now, I'm window shopping.

Originally Posted by Bagheera

Thanks for alerting us to that tahr.
Greg Duley is good at a lot of things and writing about big 7mms is certainly one of them.
That article is a good run down on the similar cartridges and the technical reasons for the 7mm PRC design and chamber/barrel specs.
So far he has only reported on a quick test of factory ammo in one factory rifle.
Like others, I was a bit unimpressed with a case failing after only 6 reloads (having got 15 so far from my 7mm08 and still going strong).

He promises to explore reloading potential in a couple of future articles.

I came across an interesting post on the Sako.global web site (search for: " 65-creedmoor-vs-65-prc-hunting " ).
Sako's advice is that the 6.5 Creedmore is very easy to find a good load for, while the 6.5 PRC does have good potential but is difficult.
I wonder if this is what we'll see with the 7mm PRC ?

At present, the 7mm PRC is largely the province of custom rifle builds and Hornady factory ammo brass, so we can expect erratic performance, sometimes stellar and sometimes random. I see a lot of advantage in a factory rifle.
Once there is a Sako 90 Peak in 7mm PRC and Lapua brass, I'll strongly consider it. For now, I'm window shopping.

@Bagheera that's gonna be very light for a stout calibre, be a fair bit of extra kick to it I imagine? Or do you mean with a brake ?

Originally Posted by Tahr

Just out the last few days. The article explains, clarifies or corrects just about every statement and question on here about the 7mm prc so far.

Useful article re the design approach for the 7 PRC plus interesting the comments re 7 Saum and the T3