6.5/7 PRC Build

[260shooter]

Out of curiosity, what advantage would the 6.5/7 PRC have over a 6.5 Weatherby RPM throated like the 6.5 PRC? Based on the info I have been able to find, the 6.5 RPM has only one grain less water capacity than the 7mm PRC (81 gr vs 82).

I couldn't tell you. I have not researched the 6.5 Weatherby. Maybe ADG brass?

 

[BAKPAKR]

I couldn't tell you. I have not researched the 6.5 Weatherby. Maybe ADG brass?

Peterson brass is available for the RPM and I think that is supposed to be good brass (at least I tell myself that because I use Peterson 280 AI brass ).

 

[huntnful]

Out of a 22” 5 groove proof barrel.

 

[Treelineasassin]

What freebore is everyone using for a 156, 0.225 or so?

 

[260shooter]

The freebore in my chamber is .340 and a freebore diameter of .265.

I've just started working with the 156. will update when I have more data.

 

[huntnful]

What freebore is everyone using for a 156, 0.225 or so?

Gun smith said his freebore was .180. Here’s a 156 touching the lands

 

[khuber84]

The freebore in my chamber is .340 and a freebore diameter of .265.

I've just started working with the 156. will update when I have more data.

That's insanely deep, I love it.

 

[huntnful]

That's insanely deep, I love it.

Haha hell yeah it is! I wasn’t sure if I’d want to scream 140’s and wanted some freebore room to play with them also. But the 156’s .010 jam in a .180 freebore shot great for me.

 

[huntnful]

Got my 26" carbon benchmark sendero 1-8 twist in.

My current barrel is a 22" 1-7.5 twist proof. It's looking like it safely tops out right around 69gr. N570 at 3110FPS.

Putting the new barrel on after this aoudad hunt next month and searching for 3200+ with 156's out the 26" with less twist. I think it'll be a breeze.

 

[260shooter]

I have a 24" CF Proof 8 twist to go on when the 22" is done.

 

[huntnful]

6.5-7PRC

22” proof sendero 1-7.5 twist

156 Berger
CCI 250
68gr. N570
.010 Jam

944 yards checking BC. Used 3050fps and .34 G7 in my revics. Holding .5 MOA right for a little varying right to left breeze.

 

[260shooter]

That's outstanding!

This cartridge is uncanny in it's ability to attain great numbers.

 

[huntnful]

That's outstanding!

This cartridge is uncanny in it's ability to attain great numbers.

I'm honestly enjoying it. I could go 69gr. at 3100, but it is just the faintest hair into pressure. So I settled on 68. I kept my cases in the pickup at 70 degrees yesterday during the test as well.

 

[260shooter]

Had decent weather today. Finished the ladder with Berger 156 and Ramshot Grand. Hand clicker and slight ejector swipe at 72.4 and 3098 fps. Going to load up 5 of the two lower charges of 71.8 and 72.1 with velocities of 3083 and 3089 fps respectively. Check ES and SD and group size and report back.
Top velocity was with 73.0 grains at 3143 fps and to much pressure signs.

 

[huntnful]

Had decent weather today. Finished the ladder with Berger 156 and Ramshot Grand. Hand clicker and slight ejector swipe at 72.4 and 3098 fps. Going to load up 5 of the two lower charges of 71.8 and 72.1 with velocities of 3083 and 3089 fps respectively. Check ES and SD and group size and report back.
Top velocity was with 73.0 grains at 3143 fps and to much pressure signs.

Good info.

I have exactly 150 rounds down my barrel. Cleaned it last night to take a look at it, it wasn’t super terrible really. Hardly any cracking past the freebore area.

I have 200 rounds down my 7-300 NMI and it looks much worse. Fire cracking about 3” down the barrel so far.

 

[Longshot_ultramag]

6.5-7PRC

22” proof sendero 1-7.5 twist

156 Berger
CCI 250
68gr. N570
.010 Jam

944 yards checking BC. Used 3050fps and .34 G7 in my revics. Holding .5 MOA right for a little varying right to left breeze.
View attachment 841629
View attachment 841630

Seems like an awesome cartridge without going too overbore.

 

[huntnful]

Seems like an awesome cartridge without going too overbore.

I'm starting to feel the same way. I already have 2 more .264 barrels and 7 PRC brass on standby. I'm really liking it. I'm going to throw on a longer steel barrel, and possibly commit to just the 6.5-7PRC with a 156 Berger at 3100+ for the season.

But the year is still young and I change guns/cartridges/bullets more than I change my underwear lol. But I'm liking it!

 

[JM151]

Would love to see what a 6.5-7 PRC Improved or a 6.5-7 PRC Imp+P can do on a 16” or 18”.