6mm PRC

[McNamara0851]

61 grains of RL26 with 90 ELD-X is yielding 0.5-0.7 moa groups at just shy of 3800 fps in a 26” 1:9 twist barrel. Never ran into pressure, but groups were opening back up beyond that. Lapua brass 210M primer. It took 100 rounds of load development to find something this barrel likes. Im going to settle on what I have for now, before I burn it out.

 

[4O6shootist]

That bullet will be a bomb upon impact at that velocity! Would love to see some terminal necropsy photos, assuming this is a huntig rifle. I'm picking up my 6prc at the smith Wed morning, it's a 20" 7.5tw, 0.200 freebore, Bat vesper, McMillan mountain tracker LR. Plan to run nose ring 115 dtacs at 3100-3200 with rl26.

 

[McNamara0851]

That bullet will be a bomb upon impact at that velocity! Would love to see some terminal necropsy photos, assuming this is a huntig rifle. I'm picking up my 6prc at the smith Wed morning, it's a 20" 7.5tw, 0.200 freebore, Bat vesper, McMillan mountain tracker LR. Plan to run nose ring 115 dtacs at 3100-3200 with rl26.

I’ve had great luck with the 90s @ 3200 out of std bolt face 6mm cartridges, they are absolute grenades. Should be pretty neat with another few pounds of energy behind them.

 

[Jamielee]

That bullet will be a bomb upon impact at that velocity! Would love to see some terminal necropsy photos, assuming this is a huntig rifle. I'm picking up my 6prc at the smith Wed morning, it's a 20" 7.5tw, 0.200 freebore, Bat vesper, McMillan mountain tracker LR. Plan to run nose ring 115 dtacs at 3100-3200 with rl26.

I have been using a 103 ELDx at around 3723fps with pretty destructive results. Fox was at 375 yards and coyote was around 250. Mine is a 6 PRC Ackley improved and I’m using Staball 6.5.

 

[shootingnut]

I have been using a 103 ELDx at around 3723fps with pretty destructive results. Fox was at 375 yards and coyote was around 250. Mine is a 6 PRC Ackley improved and I’m using Staball 6.5.

That is some psychotic damage. Did you say what twist rate? Because I'm almost certain in my 7.5twist that speed would blow those suckers up.

 

[Dogtown]

Definitely puts the square in the "velocity squared" term of the kinetic energy equation.

 

[Jamielee]

That is some psychotic damage. Did you say what twist rate? Because I'm almost certain in my 7.5twist that speed would blow those suckers up.

Sorry for the late response but it’s an 8 twist. No jacket failure yet. I’ve even shot 90 eldx faster just fine. The 55 noslers at 4400 blow apart though

 

[4O6shootist]

20in 7.5tw, 58gr H1000 in adg brass, 112 Barnes at 3150fps, shoots half minute. Running it bout a grain below flat primers which is 3200fps.

Build: bat vesper, McMillan mountain tracker LR, UM DBM, ace 20" 7.5tw light palma. Running a Triji 3-18x44 tenmile, DD Wolfhunter 6mm can, and gunwerks bipod, whole setup is 10.5#, great hunting weight.

 

[Dogsniper]

Just picked up 2, 24 inch proof research carbon fiber barrels with an eight twist off the PX. used to shooting 243 Ackley . I’ll have both these chambered up in the six PRC

 

[shootingnut]

Guess I'll give an update since it's been a while. It still hammers but it felt like I was getting too many flyers with the Atips resulting in overall bigger group sizes. Not sure if that's the barrel burning out or the bullets not being able to hold up to the RPMs, so I figured I'd try some Berger LRHT 109s that I was able to find and I've wanted to try them over the Atips for a while. I like the Berger consistency and thick jacket of the target line to keep the bullets together at speed (though to be fair I haven't had any issue with the Atips in that regard). I tried the same powder of n565 and got pretty much the same results as the Atips, maybe ever so slightly better groups.

n565 with Berger 109s (wish 2 shots I pulled removed)

Then I figured I'd try some h1000 that a buddy had laying around and that shrunk the groups by a decent amount and it also meters really well. I also like the temperature stability of the Hodgon's because I'd easily get 75fps swings from summer to winter with n565. I prefer a load that I can keep the same all throughout the year.

I ended up with 58.5grs of h1000 that sent the 109s at 3405 fps from my 26" barrel. Not bad at all. I also proofed the bullet at this speed at distance and made it to 800 yards without any jacket separations, that's with my 7.5 twist 5R Bartlein, for another data point.

h1000 with Berger 109s (with 2 shots I pulled removed)

Chrono data is with 20 shots

I'd still like to improve groups a bit more since we're in the off season but I'm not sure what else to try. Maybe a neck trim to get the case mouths consistent? For me, the case mouths come out kind of warped / slanted after the neck down from 6.5. Has anyone burned out a barrel on this yet? By my estimation, this barrel is at around 600 give or take, so I feel like it should still have some life left in it.

Other thing I've been considering trying is the 115 DTAC with Nosering that all the 6 UM guys on Rokslide talk about. Could potentially produce better group sizes, but David Tubb only sells them in batches of 500 and I'm not sure I want to jump into that kind of commitment without testing them first.

Oh and I also found out while sighting in for night time thermal coyote hunting that n565 in sub 30 degree weather and CCI BR2 primers cause hangfires and poor ignition. Switched to FGMM MLRPs and problem was solved. I haven't tested the BR2s with the h1000 but frankly I don't care to since I have enough FGMMs in my stock.

Here's some of those 110 Atips hammering some yotes. I love that it just absolutely anchors them even on the longer shots.