6.5 PRC formed to 7mm SAUM?

[smokinghole]

Looking at the price of the 6.5 PRC it's tempting to get some and try to run it through my 7MM SAUM die. I cannot find a reamer print, seems Hornady hasn't release it yet, not that I could find. At $0.80/ea it seems like a viable option to $1.30-$1.50 Norma 7mm SAUM. 6.5 SAUM should be an easy neck up but it's no cheaper than Norma brass currently.

 

[Kurz]

smokinghole,

The point to consider is that the PRC case has a head diameter of 0.532" while the RSAUM case has a head diameter of 0.551". This would be quite a bit of fireforming for one case to tolerate. Even if it worked (which I don't recommend), you would see quite a bit of shortening of the finished case. Nice idea to save money, bad idea to follow through on.

I would just re-barrel for the 6.5 PRC and have done with it.

Regards.

 

[smokinghole]

Thanks, I didn't know the case head size on the PRC. I couldn't find dimensions or a case diagram. I thought it was just a slightly different 6.5 SAUM from Hornady based on the himhawing about how similar they were when I looked into it quickly having the thought.

 

[Ringostar]

The PRC case is a little skinnier and a lot longer. It uses the 375 Ruger case. If you want to form cheaper brass down for an RSAUM, Hornady makes 300 WSM brass. You can size them shorter, then trim the necks down. A couple years ago there were some F open shooters sizing WSM brass down to RSAUM, and leaving the longer neck on the brass. It was done to slow throats burning.

 

[WSnyder]

JGS has an okay from Hornady to supply reamers. I asked Manson to supply one but they said it was proprietary and wouldn't consider it. I tried to tell them Hornady would okay it but they wouldn't budge at the time. JGS will alter dimensions if desired. I had them make one up with a shorter FB.

 

[jbpmidas]

Hornady 6.5 SAUM brass is currently $100/100 in GAP’s website.

 

[Kurz]

To clear this up, the PRC case is based on the .300 RCM (Ruger Compact Magnum) and has a case length of 2.090". The RSAUM case is 2.035" in length. The .375 Ruger is the parent case only for the .300 RCM and the .338 RCM.

For those that only suspicion the performance of this cartridge, my 26" barreled PRS rifle can easily manage 3050 fps. which is just under the PRS speed limit of 3100 fps. This is with the classic H-1000 loads but featuring the 130 class match bullets. You can achieve the same velocity with VVN-165 as well.

My 30" F-Class rifle will go well past 3300 fps but at a slight increase in pressure over the PRS loads which routinely run in the 55,000 psi range.

Regards.

 

[smokinghole]

Hornady 6.5 SAUM brass is currently $100/100 in GAP’s website.

That's funny when I posted this earlier it was $150/100. Then I saw a post in the 6.5 SAUM Facebook group about the price difference between the two. Now, it's cheaper mere hours later..

 

[jbpmidas]

George Gardner said a few months ago the price would be coming down, once initial start up costs were recouped.

 

[Hydenseek]

7mm saum from 6.5 prc..... hold my beer!!

 

[jfseaman]

the PRC case is based on the .300 RCM (Ruger Compact Magnum)

Yup.

 

[RustyPin]

It seems Marketing would have chosen the 7-LRM instead of the Short 6.5 PRC.

 

[EXTREME]

To clear this up, the PRC case is based on the .300 RCM (Ruger Compact Magnum) and has a case length of 2.090". The RSAUM case is 2.035" in length. The .375 Ruger is the parent case only for the .300 RCM and the .338 RCM.

For those that only suspicion the performance of this cartridge, my 26" barreled PRS rifle can easily manage 3050 fps. which is just under the PRS speed limit of 3100 fps. This is with the classic H-1000 loads but featuring the 130 class match bullets. You can achieve the same velocity with VVN-165 as well.

My 30" F-Class rifle will go well past 3300 fps but at a slight increase in pressure over the PRS loads which routinely run in the 55,000 psi range.

Regards.

Hi Kurz,

You must have a PRS chambered with a 6.5-300RCM reamer by PT&G which I understand has a Freebore of 0.1302". I had the first 6.5 300 RCM/6.5 EXTREME, made by PT&G in 2009 with 0.147" Freebore to run the 140 Berger jammed. The following drawings show it with case length at 2.09" and a 6.5 PRC drawn from the JGS print recently released by Hornady to the public. It has a case length of 2.02" and the shoulder has been set back by about 0.070" to 1.5648". Also it has 0.1882" Freebore to accommodate the longer 143/147 Hornady Factory ammo which will likely jamb in your chamber.


Chamber comparisons:

 

[Kurz]

It's hard to say since it's been around 9 years ago when we made the first, second and third revisions on the reamers. We cut 3 chambers and I made sizing dies and seating dies. This was just before we started the 6.5 GAP 4S work. The RCM (now PRS) cartridge got tabled in favor of the 4S. The reamer I used on my barrels was the third revision. My data is drawn from my notes on the loads not the reamer development.

 

[EXTREME]

It's hard to say since it's been around 9 years ago when we made the first, second and third revisions on the reamers. We cut 3 chambers and I made sizing dies and seating dies. This was just before we started the 6.5 GAP 4S work. The RCM (now PRS) cartridge got tabled in favor of the 4S. The reamer I used on my barrels was the third revision. My data is drawn from my notes on the loads not the reamer development.

I just received a copy of the PT&G 6.5 PRC G.A. Precision reamer print drawn 1/26/17 and checked by George Gardner. It is the one with the 0.1302" Freebore and is the same as the JGS except for the 0.1882" Freebore and a 0.296" Neck which is 0.003" smaller than the JGS. There would be no Headspace problem with the Hornady 6.5 PRC Ammo or brass as there would be in a 6.5-300RCM/EXTREME which would have to have brass formed from the 300RCM case. However there may be a problem with the Hornady Factory Ammo jamming the lands in the PT&G chambering which people should be made aware of.

AmmoGuide info ON THE 6.5 EXTREME
http://ammoguide.com/cgi-bin/ai.cgi?sn=VPVhkrVgXR&catid=762

 

[Kurz]

However there may be a problem with the Hornady Factory Ammo jamming the lands in the PT&G chambering which people should be made aware of.

There were no rifles or barrels released to the general public at that time so the only chambers available to the public are from the new print and reamers. Everything was kept in house and tabled after we started on the 6.5 GAP 4S. No need to worry.

 

[EXTREME]

There were no rifles or barrels released to the general public at that time so the only chambers available to the public are from the new print and reamers. Everything was kept in house and tabled after we started on the 6.5 GAP 4S. No need to worry.

Thanks. That is great as this promises to be a great cartridge for hunting with the 143 ELDX. Of course there will be those who complain that 2960 fps is not nearly fast enough from this cartridge but how many will shoot a moose to 700 yards which is possible with 1270 ft. lbs. retained energy. Sighted 2.5" @ 100 yards will Zero @ 250 yards and be point blank to 300 yards on a 6" target. The 147 ELD-M, at 2910, will match the trajectory of the 143 grain to 700 yards with about 12 MOA from a 100 yard Zero.

What is not to like when you consider the recoil compared to a 7mm Mag for example?