• Watch Out for Scammers!

    We've now added a color code for all accounts. Orange accounts are new members, Blue are full members, and Green are Supporters. If you get a message about a sale from an orange account, make sure you pay attention before sending any money!

7mm PRC

I've shot them and no issue then reloaded them and had 2 open hard. Posted on other forum last night I took that ring down on a couple cases and headspaced measured. 001 to .0005 difference so not sure it's a huge thing. I don't like it but they work if have to use them. I separated all mine and will keep them separate and run some tests with same handloads to see if it effects anything performance wise
 
They said it’s because 7 prc is not CIP approved yet, then once it is they’ve got to get it into their production schedule
 
  • Like
Reactions: ma smith
So tikka is gonna roll out 7prc with their legacy 9.5tw 7mm rate? That's an epic fail in the makings. Their 243 is just now getting 8tw, maybe they'll do a 6cm before 2030.
 
  • Haha
Reactions: ma smith
So tikka is gonna roll out 7prc with their legacy 9.5tw 7mm rate? That's an epic fail in the makings. Their 243 is just now getting 8tw, maybe they'll do a 6cm before 2030.
IIRC Hornday is loading at 2,950 for 175s based on current spec
∆ 6 GROOVES TWIST: 8.00 (203.2) R.H. OPTIONAL
∆ .110+.002 (2.79+0.05) WIDE MINIMUM BORE & GROOVE AREA: .0626 in² (40.387 mm²)
CIP spec is most likely going to be the same as SAAMI.

 
Posted on rokslide as well, but anybody else seeing pressure issues on the factory eldx? On my once fired brass I’m seeing a ring that looks like the beginning of case head separation. I can’t feel anything inside the case that would indicate an issue. Is this the ring you mentioned @Schw15 ? Also seeing ejector marks on several pieces. None of these pieces have been run through a sizing die, only a decapping die. Is this a chamber issue or overpressured factory ammo?
00DF4F90-9DBE-4794-A7AD-08FA5714D74D.jpeg
D862EFAF-A64B-482F-A771-6D9C4DBCF197.jpeg
FAA79B2A-57A8-4AC3-BC8B-084ECA4CF7F0.jpeg
 
No it's not the ring I was talking about. It was on the bottom of the case and it was on outter part on brass but doesn't seem to effect anything and hornady said that is there new brass making process. As far as the 175 eldx I never shot any and unfortunately i actually just sold out of the 7 prc stuff to free up some cash for the nightforce challenge. But the 7 prc has great promise specially with handloads. The ammo looks a little hot but those rings on the cases usually show up after you full length resize the brass shows where the die stops on case
 
those rings on the cases usually show up after you full length resize the brass shows where the die stops on case
Yeah if these had been resized then I wouldn’t be questioning it. These haven’t been run through the die yet though. This is how they came out of the rifle
 
That is very strange do you have a virgin brass to measure and then measure that to see how much it swelled up?
 
That is very strange do you have a virgin brass to measure and then measure that to see how much it swelled up?
.534 at the ring, .530 just below it, right before the case head. Same locations on unfired brass is .527 and .529 respectively

ETA: measurement at the shoulder/body junction is .518 on fired and .514 on unfired
 
  • Like
Reactions: ma smith
That ring should be close to the .200 line and my fired brass measured .5305 usually and sized .5295. .534 is pretty big did you get a aw reamer? What is the barrel
 
Unless I am misinterpreting the chamber specs, it should be .532 +/- .008. That would put it right at .534 which checks out with what I’m seeing. Maybe it’s not oversized, just maximum sized?
 
Unless I am misinterpreting the chamber specs, it should be .532 +/- .008. That would put it right at .534 which checks out with what I’m seeing. Maybe it’s not oversized, just maximum sized?

Read that thread
 
  • Like
Reactions: TxLite

Read that thread
Helluva thread but it sounds very similar to what I’m seeing. Out of curiosity I ran 2 pieces through the FL Hornady sizer and bumped the shoulders back .002. The ring on both is measuring .531 and the shoulder/body junction is showing .516
 
  • Like
Reactions: Schw15
Saami spec should be .533 on reamer then .535 for the aw2 reamer specs to prevent clickers. I would call and see what reamer they used.
 
If anyone needs any hornday bushing match dies let me know have a set with no use for them now
 
@TxLite, so those are the rings I have on my brass. Tldr on the 12 page LRO thread, cliffs notes version?
 
  • Like
Reactions: DMP
Could it possibly be where solid case head transitions to the case walls? You get some flex there at the "web" upon firing. I doubt it's over expanding in saami chamber. Virgin brass should measure 529, fired 530-531 max, sized should get you to 530 or less for chamber clearance. This is typical of soft Hdy brass. Been experienced in 65 and 300prc.
 
  • Like
Reactions: tho98027
Could it possibly be where solid case head transitions to the case walls? You get some flex there at the "web" upon firing. I doubt it's over expanding in saami chamber. Virgin brass should measure 529, fired 530-531 max, sized should get you to 530 or less for chamber clearance. This is typical of soft Hdy brass. Been experienced in 65 and 300prc.
that’s where it appears to be. I’m getting .534 and the Hornady sizer brings it to .531. Unfired brass is measuring .529.
 
that’s where it appears to be. I’m getting .534 and the Hornady sizer brings it to .531. Unfired brass is measuring .529.

My sized brass (Whidden FL) is coming up .532 at the ring. Unfired I get .527.
 
What is your fired brass vs sized brass. Clickers are a huge plague for any caliber now with thicker brass. But basically the die doesn't size the fired case enough and then when opening bolt at the top your primary exacting kicks In and pops open with a click. My prc was .5305 fired and .529 sized
 
  • Like
Reactions: 300PRC
what are 'clicker' issues,
Clickers are where the base is too big and swells in the chamber and when the actions primary extraction frees it the bolt handle clicks up instead of going smoothly.
the clickers video is down the page a bit, the chamber and die fit video is a good one that sorta addresses it as well
 
  • Like
Reactions: Schw15
Thanks guys, I will take a look at the video. Learn something new everyday. So is this a brass issue, a chamber issue, or a sizer issue?
 
OK, that video was a good explanation.

I could tell I was going to have it with the barrel not on the action. This is an AXSR and I had the barrel off. The brass has already been sized and bumped back 2 thou. Brass sticks in the chamber and requires just a bit of effort to pull out. With the barrel on, feeding the brass into the chamber requires more effort than usual.

Barrel was chambered by Blue Mountain Precision.

So AW's explanation in the video made it sound like it is usually a sizing die issue. Assuming the AW2 reamer addresses this?
 
And another stupid question I guess... are the rings a visible indicator of where the brass has swelled? Save to use or no?
 
The Hornady dies I used resized enough for no clickers but the 7 prc aw reamer would be an easy for sure fix. Short action customs makes a die to prevent clickers but not sure if it works. Might try another die or send it off specially if your taking it to nightforce challenge.
 
that’s where it appears to be. I’m getting .534 and the Hornady sizer brings it to .531. Unfired brass is measuring .529.
If fired is 534, chamber is likely 535 with the spring back. 531 sized should be good to go. If your chamber is saami spec, its way oversized at 535. Call barrel manufacturer and ask for reamer print and maker. Jgs makes in spec reamers 99% of time, everyone else is hit and miss. Or the barrel was dialed in poorly, or they had a bad reamer fixture causing it to walk. Lot of things.......or its AW2 spec with 535 as previously mentioned and all is well.
 
  • Like
Reactions: TxLite
I had a 6.5x55 improved chamber that was giving me clickers after a couple reloads. I had a set of custom whidden dies made after the clickers showed up and sent in 4x fired brass. The new custom dies still didn't help. Would still get clickers. My opinion its a chamber issue. Just too tight in the case head/web area. Looking at the original reamer print and compared it to other 6.5x55AI, the chamber was definitely too tight in the web area compared to other AI reamer prints I researched for the swede. Looking at reamer prints of the 6.5 prc, 300, prc and 7 prc, and seems like Hornady went a little tight on the chamber measurements in the web. It's probably fine for hornady brass. But I can see why Alex Wheeler made an updated AW2 reamer to solve these clicker issues with Lapua brass. It doesn't need much. The sammi reamer only probably nees another 1.5 thousands of diameter in the rear of the chamber. OP, when peterson starts offering 7 prc brass, you may see the ring go away with their brass, since their brass runs a little thicker like lapua. Your measurements still seem a little on the big side but sounds like it's still with in sammi spec.
 
  • Like
Reactions: TxLite
Maybe a large caliber magnum is different but you shouldn't need .004" web sizing to prevent expanded webs sticking in the chamber. On a 6BR you only need .0005" to .001". Check out Harrell's dies. They sell dies based on EXACT web specs to bench rest shooters. Their dies are made to produce webs sizes to the identical web diameter of the chamber. But sizing die and chamber relationship are only one cause of clickers. If you run too high pressure you can cause it with one firing. You could be just running too hot. And with Hornady brass you might be getting that phenomenon without even being that overpressure. Just soft brass. Alpha had this problem with their first run of 6GT brass. Didn't matter the pressure, it happened anyway.
It wasn't just 6GT...hence OCD everything
 
  • Like
Reactions: reubenski
FYI, I sent an email to Forster asking when they'd have dies in 7mm PRC. They wrote back and said they expect to have them by April of this year.