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7mm PRC

#851
This is

180 eldm
rl26. 66.5gr
Norma brass 2x
215m primer
Gives 3015 and SD 7

Was actually fussy about seating depth. Shot well at. 005 and .050 and nowhere else.
1000002608.jpg


Bergers 184 worked across a broad range of powder charges. This was 66.5 and 66.8

1000002609.jpg
 
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#852
As a follow up question - who has found an acceptable powder in LRT, Magnum, Retumbo, etc. my bbl doesnt love h1000, and it could be 2 years before i find another keg of rl26 (which i burn in my 6.5prc as well)

anyone?
 
#853
Mumzergadol said:
As a follow up question - who has found an acceptable powder in LRT, Magnum, Retumbo, etc. my bbl doesnt love h1000, and it could be 2 years before i find another keg of rl26 (which i burn in my 6.5prc as well)

anyone?
Click to expand...
What bullet weight? I’m using Retumbo for Berger 190s and it is getting near 3000 fps in a 30” barrel. SDs are a bit higher than I prefer, but results on target have been very acceptable.
 
#855
Mumzergadol said:
As a follow up question - who has found an acceptable powder in LRT, Magnum, Retumbo, etc. my bbl doesnt love h1000, and it could be 2 years before i find another keg of rl26 (which i burn in my 6.5prc as well)

anyone?
Click to expand...
I've had good luck with Ramshot Grand, velocities up there with RL-26, temp stable and available. Staball HD was ok, but didn't really live up to the billing for me, unlike Grand.
 
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#857
H&H Precision Outdoors said:
Finally had time over the last 2 weeks to finish load development on my custom 7 PRC. Here is my load I worked up in my rifle:

Peterson Brass (2.2630”) trimmed (wet tumbled, & annealed)
(3) thousandth neck tension
Federal 215m Match Primer
(66.20g) H1000
Berger 190g LRHT
AVG group size: (.25”)
AVG muzzle velocity: 2970fps

(Chronograph data was taken today for the 4th confirmation group)
Click to expand...
what barrel length are you running with those speeds and charge? thank you
 
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#859
secondofangle2 said:
I'm using Hornady for load development till Lapua comes out. I have 100 pieces, 20 of them were sacrificed to the pressure gods. 30 pieces have loosening but useable pockets.

The other 50 pieces have never seen more than 67.5 grains of H1000 with 180 grain bullets and should last the typical 10 or so cycles, I'm guessing.

I purposefully got junk brass for load development. I throw it away without a twinge of regret.
Click to expand...

How many firings before primer pocket loosening and too loose leading to tossing?

Also for those whom see this how many firings are you all getting out of ADG and Peterson brass at this point w/o signs that you need to toss the brass (i.e. primer pocket loosening, neck splitting etc). I reload a lot but creedmoor, GT, BR, and dasher.... the large magnum brass makes that brass seem cheap in comparison. I have 10 firings on Lapua dasher brass it's crazy and it's still going strong.

Thank you
 
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#860
If I stay at or below book max of 67.5 grains of each 1000 with a 180, I think they will last indefinitely without expansion
Primer pocket expansion is invariably a result of an over pressure load. At least over pressure for that brass.

As soon as I hit 68 grains or more, the primer pockets expand

I eagerly await Lapua brass, and I will buy a couple hundred cases and be done with it for the rest of the life of this barrel. And maybe even the next barrel
 
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#861
secondofangle2 said:
If I stay at or below book max of 67.5 grains of each 1000 with a 180, I think they will last indefinitely without expansion
Primer pocket expansion is invariably a result of an over pressure load. At least over pressure for that brass.

As soon as I hit 68 grains or more, the primer pockets expand

I eagerly await Lapua brass, and I will buy a couple hundred cases and be done with it for the rest of the life of this barrel. And maybe even the next barrel
Click to expand...
I would recommend Peterson as well. I have always found them to be on par with each other.
 
#863
Everybody loves Peterson. I still have a bitter taste in my mouth from the first batches of 375 they put out, which experienced significant growing pains.
 
#864
I was hitting 2970 with a 20 inch barrel and got...wait for it...2 firings. Then the primer pockets were as loose as a goose over a new car lot. I backed it down to less than thermonuclear pressures

Edit to add: Thermonuclear pressures were experienced here and I would not advice trying to get there. I wasn't sure if I was going to get my bolt open a few times.
 
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#871
I have to blame Hornady in large part for this pursuit of speed with this cartridge because they over-promised on the basis of a single powder that turned out to be a unicorn.

And of course, making it just slightly less capable than the 7 mm Remington Magnum also seems to have been a mistake. Why not just bump up the capacity and make it equivalent to 7 mm (85 gr H2O) since you’re designing a whole new cartridge anyway? Most everybody is shooting it in a long action anyway, and you still got rid of the belt and have plenty of room to see long bullets and fit in the magazine.

But what the hell do I know? Maybe the projectiles perform best if you keep them under 3000 ft./s.
 
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#872
secondofangle2 said:
I have to blame Hornady in large part for this pursuit of speed with this cartridge because they over-promised on the basis of a single powder that turned out to be a unicorn.

And of course, making it just slightly less capable than the 7 mm Remington Magnum also seems to have been a mistake. Why not just bump up the capacity and make it equivalent to 7 mm (85 gr H2O) since you’re designing a whole new cartridge anyway? Most everybody is shooting it in a long action anyway, and you still got rid of the belt and have plenty of room to see long bullets and fit in the magazine.

But what the hell do I know? Maybe the projectiles perform best if you keep them under 3000 ft./s.
Click to expand...
I agree. They dropped the ball, screwed the pooch, lost their marbles, (insert other catchy phrases here) etc... I understand they were probably benchmarking a 24 inch barrel, but it's a tough pill to swallow when it's 50fps per inch off of the speed I was trying to replicate with hand loads. It's my fault, but I do sort of regret it. Although I was trying to get 3k fps I feel like I would have gotten it with a 24 inch tube. But who wants that with a suppressed hunting rifle? I don't regret going short, but I understand the velocity really takes a nose dive when you drop under 22 inches. I wished I would have gone with a shorty 7 saum instead.
 
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#873
Personally if I was going short I'd stick with .308. If I wanted more velocity, presumably because I was shooting further, I'd go with a longer barrel for a magnum cartridge. Looking at the amount of powder I would expect 26" to be ideal for 7 PRC.
 
#874
My brother was shooting 180 hybrids at 3000 fps with his 7 saum in a 24 inch barrel with no problems. The 7 saum holds velocity very well with shorter barrels from what I've heard and I believe it would be a very close match to the 7PRC. A 30 cal pill puts a nice hole but the form factor of a short barrel hunting suppressed makes the difference for me. Id shoot a 30 cal with a short barrel too, but I want it to be zippy.
 
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#875
Raffy said:
I agree. They dropped the ball, screwed the pooch, lost their marbles, (insert other catchy phrases here) etc... I understand they were probably benchmarking a 24 inch barrel, but it's a tough pill to swallow when it's 50fps per inch off of the speed I was trying to replicate with hand loads. It's my fault, but I do sort of regret it. Although I was trying to get 3k fps I feel like I would have gotten it with a 24 inch tube. But who wants that with a suppressed hunting rifle? I don't regret going short, but I understand the velocity really takes a nose dive when you drop under 22 inches. I wished I would have gone with a shorty 7 saum instead.
Click to expand...
And that is what Federal is trying to do with 7 mm BC. Shorter barrel pushing close to 3k fps. So, a shorter, possibly lighter rifle, especially for hunting. But I think the recoil if the 7 BC is going to be a bit of a stinger. Then, again, 7 PRC has by the math, more recoil impulse than a 308 and less than a 300 WM.
 
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