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20” barrel 6cm pressure issues

First thing I would do? Bore scope your barrel and see how dirty it is. My 6 CM speeds up with the increased pressure from about 3080 to 3150. Seems to happen right around every 250-300ish rounds and then requires a decent cleaning. My buddies Savage with the factory barrel was even worse, 100-150 round cleaning interval, and his velocity would spike from 3020 to 3140 and he would blow primers. Not sure about your rifle, but the Berger Hybrids dont need to be that close to the lands to shoot well. I run the 105 and 109 Bergers 20 thou off the lands, but Ive seen guys run 60 thou off with no issues. Sometimes being too close will give you pressure signs.

Myself? Im 3080fps with a 109 Hybrid, 41.2gr of H4350, Peterson brass, 20 thou off the lands, CCI BR4 primer from a 22" Rock Creek 7 twist. No pressure signs, but when the barrel gets dirty the velocity spikes, I see heavily flattened primers and accuracy goes out the window.
OPs jump is 30 thou(.03) or I'm completely retarded. I usually run 105s @.020/20 thou off. If your velocity is correct, 3080, that load is damn hot in a 20" barrel. I'd be ecstatic with 2950- 3000 in a 20" barrel. I'd cut your charge and find another accurate node in that range. Hot August day or smoked bolt face will ruin your day. 80fps doesn't make much difference in wind hold, with same bullet. Maybe .1 at 800-1000yds, not enough to play with fire.
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Accuracy International Picture Thread

I wondered how long it would take any of y’all to pick up on that! Was beginning to get concerned when nobody here thought that was weird…
In the AI thread here all my weird needle did was shiver....
Are we about to see the return of the 7th Axis?
Might even break out some epoxy too!

Are the FN SPR enthusiasts extinct?

Well I just got a winning bid on an FN PBR so let's hope let's hope those truly are the same as the SPR (however trued they are or are not) haha. Of course I know the barrel is not chrome lined and different stock .

If it is a PBR XP, then it is the same action as the SPR. If it is just a regular PBR then it is a push feed.

Are the FN SPR enthusiasts extinct?

Lots of posts in this thread saying they were trued, but never seen an official document from FN stating such.

Although a half moa guarantee on the a3g does lead me to believe they were either trued or the receiver threads were very carefully cut which would be the same thing
Well I just got a winning bid on an FN PBR so let's hope let's hope those truly are the same as the SPR (however trued they are or are not) haha. Of course I know the barrel is not chrome lined and different stock .

Maggie’s THE "NOM NOM NOM" THREAD

A little thing about wood and a traditional side burner.

The quality of the wood will shine through. Any disturbance of wind heat cold rain changes things, pay attention and make adjustments.

My ribs get 60-70 % oak and a mix of pecan and a little mesquite.

Well I guess you can't call it a smoke ring if it goes all the way through. Lol
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