7mm PRC is SAAMI approved.

[pathfinder76]

Well now I am disappointed I was hoping it was more like the 280 Ackley, let me know your practical results once you’ve shot yours, looking forward to it.

I’d like to know where those case capacity numbers have come from. From what I can tell they aren’t correct. Wouldn’t be correct with the AI either.

 

[Slimbo]

Maybe weatherby fan can fill a couple cases with water and let us know

 

[Weatherby Fan]

I’d like to know where those case capacity numbers have come from. From what I can tell they aren’t correct. Wouldn’t be correct with the AI either.

Ok I just weighed a new cartridge full to the top of the neck with R26 from a 280AI/7mm PRC and a once fired 7mm RM

280AI new Peterson brass- 70.1/70.0/69.9grs
7mm PRC new Robertson brass- 73.8/73.9/73.8grs
7mm RM once fired Federal brass-82.5/82.4/82.5grs

The last Robertson case I measured averaged 75.3grs of R26

 

[Weatherby Fan]

Maybe weatherby fan can fill a couple cases with water and let us know

Ok I filled the case with water,

Weight with water. 357.0grs
Weight new unfired primed 7 PRC case 281.6grs
Difference 75.4grs of water

I suspect the internal volume of RCC will be smaller than the Hornady or Peterson brass,
I’ll give it a whirl at the range tomorrow if all works out.

 

[Buckmastr]

7Rsaum R-P @ 75 gr H2O
7WSM W-W @ 83
7Rem Mag W-W @ 86
222 Rem R-P @ 29

 

[pathfinder76]

Now I’m curious. I have ADG, Peterson, and SIG 7mm rem mag brass. I’ll try and get a volume on those tonight.

 

[Buckmastr]

Hopefully you haven’t fireformed them all into obscure chamberings like the 338 WM.

 

[pathfinder76]

Really?

 

[pete dobinson]

You guys got me curious so I loaded 77 grains of RL26 easily to the base of the neck of a 7wsm cartridge. It was winchester brass. I think a 7mm wsm loaded into a long action with the right spin rate would be equal to the 7 prc. Not trying to take anything away from the 7prc, I think its an awesome cartridge. jmo.

 

[Buckmastr]

Ground breaking? No.
Game changing?? Unlikely.
New and expensive??? Yep.
Fun???? Absolutely!

 

[Slimbo]

Yup, just like pretty much everything after the 8mm Lebel.

 

[pathfinder76]

ADG 7mm rem mag brass holds 82.6 gr water, Peterson 82.5.

 

[Buckmastr]

Heavy duty stuff. Probably why W-W brass is a buck a piece. Tinfoil...

 

[pathfinder76]

R-P is worse. That’s why I make 338 Win Mag brass from 7mm stuff. WW and R-P are approaching being unusable.

 

[Weatherby Fan]

 

[Weatherby Fan]

Mounted a Zeiss V4 4-16x44 scope on the Sako A7, 8lbs 6oz should be a dream to shoot at that weight.

 

[Buckmastr]

Nice rifle. I like the A7.

 

[Weatherby Fan]

Nice rifle. I like the A7.

Thank you,

I like them as well, I thought is was a good platform to start with, not a huge cost for an all stainless donor rifle to test out the new cartridge, basically a rebarrel job, no feeding issues with the single stack mag boxes.

 

[track]

Thank you,

I like them as well, I thought is was a good platform to start with, not a huge cost for an all stainless donor rifle to test out the new cartridge, basically a rebarrel job, no feeding issues with the single stack mag boxes.

Please let us know the accuracy results on paper and velocity. BTW, what camera do you use for photographs?

 

[dan belisle]

7Rsaum R-P @ 75 gr H2O
7WSM W-W @ 83
7Rem Mag W-W @ 86
222 Rem R-P @ 29

So ballistically the 7 PRC should be very similar to the 7 saum, and thats a good performance level. - dan