6mm PRC

[Chauncymayne]

I have been doing some looking around across different forums and sites to see what kind of loads folks are running on a 6mm PRC and haven’t had much luck, especially with light weight bullets.

Planning on running solids, currently thinking 88 grain *Cutting Edge MTH* in a 7.5 twist. Anybody have any suggestion on powder types, charges, and what kind of velocity they are getting?

Brand of Brass being used would be great to know as well.

Thinking I need solids because I don’t want to worry about throwing jackets on bullets in a twist that fast, as well as hoping to have that better BC bullet in the solid. (I don’t plan on getting a slower twist barrel, I am just getting an old 6GT barrel rechambered for something fun that goes the speed of light — 3700 FPS+).

Thank you in advance!

*Edit* - Meant Cutting Edge 88 Grain Solid not Flatline.

 

[Surdez1994]

Have a custom reamer on the way now for a 6 prc sherman improved. Will be running a 7.5 twist Bartlein carbon fiber and a 1:8 proof carbon fiber. I primarily plan on shooting 105-109 bergers.

Kinport peak rifle will have that reamer once my barrels are chambered.

No data yet, obviously, but im hoping for 34-3500 without pressure but we will see

 

[Surdez1994]

Have a custom reamer on the way now for a 6 prc sherman improved. Will be running a 7.5 twist Bartlein carbon fiber and a 1:8 proof carbon fiber. I primarily plan on shooting 105-109 bergers.

Kinport peak rifle will have that reamer once my barrels are chambered.

No data yet, obviously, but im hoping for 34-3500 without pressure but we will see

Lapua brass

 

[Dogtown]

im hoping for 34-3500 without pressure but we will see

And 600 round barrel life?

 

[John Glidewell]

3400 fps with 7.5 twist is 326,400 rpm. Same speed in 8 twist is 306,000 rpm. Jacket failure happens around 300,000 to 320,000 rpm depending on bullet.

 

[Surdez1994]

And 600 round barrel life?

Barrels aren't Cheap and coyotes aint worth a dime. But i sure spend a lot of money on them 😂

3400 fps with 7.5 twist is 326,400 rpm. Same speed in 8 twist is 306,000 rpm. Jacket failure happens around 300,000 to 320,000 rpm depending on bullet.

3400 fps with 7.5 twist is 326,400 rpm. Same speed in 8 twist is 306,000 rpm. Jacket failure happens around 300,000 to 320,000 rpm depending on bullet.

I run 75 eldms at 315,000 rpms out of my 22 creed no problems with a 1:8 twist proof. I would venture to say i will be safer with a thicker jacket berger target bullet at high rpms

 

[Schamsy33]

I am working on a 6 PRC and have done a couple 25 PRCs and havent had any issues with Berger LRHT bullets spinning fast. 7 twist 25 PRC pushing the 135 at 3250fps = 334,285 rpm. 6 PRC 7.5 twist pushing the 109 LRHT at 3500fps = 336,000 rpm. Its certainly pushing it hard and other variables will come into play when running on the edge like that.

I am curious how a bullet's jacket failure due to excessive rpm varies based on the length of the barrel? Getting a 109 to shoot at 3500fps out of a 26" barrel will obviously take more powder and pressure than the same velocity with the same bullet out of a 30" barrel. RPM of the bullet would be the same leaving the muzzle of both length barrels, but that bullet accelerated to that rpm more quickly in the shorter barrel. I dont think we can safely assume that a particular bullet will always fail at a certain rpm window because there are other variables involved in how quickly it arrives at the max rpm. I think it is safer to assume that the quicker a bullet reaches max rpm, more stress has been imparted onto the jacket and it is thus more likely to fail.

 

[Chauncymayne]

I am working on a 6 PRC and have done a couple 25 PRCs and havent had any issues with Berger LRHT bullets spinning fast. 7 twist 25 PRC pushing the 135 at 3250fps = 334,285 rpm. 6 PRC 7.5 twist pushing the 109 LRHT at 3500fps = 336,000 rpm. Its certainly pushing it hard and other variables will come into play when running on the edge like that.

I am curious how a bullet's jacket failure due to excessive rpm varies based on the length of the barrel? Getting a 109 to shoot at 3500fps out of a 26" barrel will obviously take more powder and pressure than the same velocity with the same bullet out of a 30" barrel. RPM of the bullet would be the same leaving the muzzle of both length barrels, but that bullet accelerated to that rpm more quickly in the shorter barrel. I dont think we can safely assume that a particular bullet will always fail at a certain rpm window because there are other variables involved in how quickly it arrives at the max rpm. I think it is safer to assume that the quicker a bullet reaches max rpm, more stress has been imparted onto the jacket and it is thus more likely to fail.

These things are all interesting points to take into account. However, if I was going to run a heavier class bullet I wouldn’t be as concerned with the RPM’s and throwing jackets because it’s getting closer to the limit. Compared to if I was going to run a lightweight jacketed varmit bullet such as a V-Max near 4000 FPS. In order to take the possibility of that issue away, I’m going to go with a solid. That’s not a big deal to me since this gun may only be shot 50-100 times a year at most. In the information I have been able to find I’ve heard folks getting 3700 FPS+ with 88 grain bullets. Which is what I’m looking to do.

My biggest question, is what powder charges and with what powder are working in this cartridge. I’ve seen RL26 as well as I’m assuming H1000 will work. It would be greatly appreciated if you could share what loads you end up running in your 6PRC even if they are heavier.

 

[Mike Casselton]

6mm-284 data will get you in the ballpark

 

[Schamsy33]

55.5-56.5gr RL26 with 108 ELDM - the 56.5gr is just below pressure signs in my rifle with Hornady brass. 3425fps with 24" barrel
Working on new loads with Lapua brass now with H1000 and N565.

I do intend to run a 69gr Absolute Hunter or 88gr Hammer Hunter bullets at warp speed in this as well. I will share any info when I get to it.

 

[Chauncymayne]

55.5-56.5gr RL26 with 108 ELDM - the 56.5gr is just below pressure signs in my rifle with Hornady brass. 3425fps with 24" barrel
Working on new loads with Lapua brass now with H1000 and N565.

I do intend to run a 69gr Absolute Hunter or 88gr Hammer Hunter bullets at warp speed in this as well. I will share any info when I get to it.

Thanks for the information! I look forward to hearing about your findings with the light weight bullets!

 

[shootingnut]

Currently found a good load of 110 atips with 58gr of n565 and virgin Lapua with CCI BR primers, running at about 3328 fps (26" barrel) with no pressure signs. Noticed no bullet explosions yet, but I haven't taken it past the paper at 100 yards yet.

I could theoretically push the powder charge further, but I want to keep the same load for summertime and don't want to start seeing pressure when the temps here get up to 100. Gonna be taking it out to distance this weekend, will report back if the atips end up coming apart before impact.

 

[McNamara0851]

Ordered a 7t 6PRC from PVA yesterday. Sub’d for updates.

 

[shootingnut]

Ordered a 7t 6PRC from PVA yesterday. Sub’d for updates.

Planning on running solids only in that guy? I'm curious if Atips or hybrids would hold up in a 7 twist.

I can give an update as well. Been out to 765 yards twice now with the Atips and no bullet blow ups to speak of, still keeping the same load going 3328 fps in a 7.5 twist 5R.

So far I love this thing, only slightly more recoil than a 6mm Creed but way more wind bucking and slaps steel with authority and can watch my impacts clearly. Gonna see if I can smack a yote with it in the next month or so and see some terminal results.

 

[McNamara0851]

I’m not counting on being able to run anything other than solids, but I will try the 90 ELDx and 95TMK. The 77TMK in my 7.7T 22-250AI come apart around 3450. ~325,000 iirc.

 

[McNamara0851]

What is everyone’s experience/methods with brass and dies so far? This barrel is going on LH Coup De Grace action, so I will have plenty of time to gather components, but I’d like to get started sooner than later.

 

[shootingnut]

What is everyone’s experience/methods with brass and dies so far? This barrel is going on LH Coup De Grace action, so I will have plenty of time to gather components, but I’d like to get started sooner than later.

I'm running a 6.5 PRC full length sizing die, on fresh 6.5 PRC brass I'll run it through the sizer with a 280 bushing and then a 270, then load it up. Running new Lapua brass and not getting any runout or needing trimming as far as I can tell.

Still no blow ups yet from the Atips, took a couple yotes with them last night and they do some work. Based on my math they should be going about 320k RPM so I'm keeping my fingers crossed still.

 

[Djfergus]

We've took a couple of whitetails with the 6prc & 110atips @ aprx 3400fps mv. One thru the spine. Dime sized exit. The other was quartering away. In thru the front ribs & out thru off side shoulder. Quarter sized exit. Both were about 200yds away.

 

[4O6shootist]

My buddy is shooting 108 elite hunters at 3500 from a 26" barrel running 57.6gr rl26. Jumping them 70k, and it's a consistent half to third moa rifle. Coyote rig so he doesn't care how long the brass lasts or barrel for that matter.

 

[shootingnut]

My buddy is shooting 108 elite hunters at 3500 from a 26" barrel running 57.6gr rl26. Jumping them 70k, and it's a consistent half to third moa rifle. Coyote rig so he doesn't care how long the brass lasts or barrel for that matter.

What twist is on that guy by chance?

Here's some of the damage from mine, fox at about 125 yards, 3330 mv 110 atip. Also took a yote at 150 but forgot to get a picture, not as destructive results but I don't think I hit any bone on that one.

 

[4O6shootist]

What twist is on that guy by chance?

Bartlein 8tw 5r carbon 237 bore.

 

[Djfergus]

I took an armadillo @ around 125 yds with the 110 atp Blew it in half.

 

[evilsvt]

Going to take my 6PRC on an axis hunt this week. 22” 1:9 pushing a 90TGK at 3500 using 59gr of H4831SC.

 

[Chauncymayne]

Has anyone done any load development with H1000 yet? Also curious if anyone has experience with DTAC’s in this cartridge and if they have any tendencies to blow up?

 

[4O6shootist]

I just ordered a 6saum reamer with 215k freebore to shoot nothing but nose ring cut dtacs. 7.75tw rem varm hawkhill, zermatt medium action. This is going to be primarily a hunting rig.