6.5-7mm prc

[Northkill]

Great insight. Thank you!

I have 64gr. - 70gr. loaded up with both H1000 and N565 with 140 hybrids

Looking forward to your results. Intrigued by the case...

 

[Huntnful]

Looking forward to your results. Intrigued by the case...

Me too! It'll be a few days before I'll test it, with work and a week long storm starting tomorrow here.

 

[260shooter]

Anyone that currently has one of these 6.5-7PRC's mind sharing some load data with charge weights? I'm planning to shoot 140 Hybrids with either H1000 or N565 and was just hoping for a good starting point for a pressure ladder. And possibly a realistic ending point as well.

I have a 6.5/7 PRC and run 147 ELD-M's at 3100 fps (3077 @ 25 degrees) in a 22" 8 twist, using 68.2 grs of H-1000 and Fed 210M primers in ADG brass.
While doing a ladder test anything over 66.0 grs gave low single digit SD's.

 

[Will.284]

I have a 6.5/7 PRC and run 147 ELD-M's at 3100 fps (3077 @ 25 degrees) in a 22" 8 twist, using 68.2 grs of H-1000 and Fed 210M primers in ADG brass.
While doing a ladder test anything over 66.0 grs gave low single digit SD's.

I've been looking at the6.5/7PRC myself. Thanks for this info , pretty much made up my mind !!

 

[Huntnful]

I have a 6.5/7 PRC and run 147 ELD-M's at 3100 fps (3077 @ 25 degrees) in a 22" 8 twist, using 68.2 grs of H-1000 and Fed 210M primers in ADG brass.
While doing a ladder test anything over 66.0 grs gave low single digit SD's.

Oh that's excellent info!

I have ADG brass and using 210M's as well. I used a .290 bushing and necked it down in one step, and the expanded with a .263 mandrel.

Here's a 140 hybrid target touching the lands in a .180 freebore.

I seated .020 off for the pressure testing and shooting the barrel in a little initially.

 

[260shooter]

My guess is it will set up and beg biscuits off the table at around 69.0 grs of H-1000.

 

[stazmania]

Oh that's excellent info!

I have ADG brass and using 210M's as well. I used a .290 bushing and necked it down in one step, and the expanded with a .263 mandrel.

Here's a 140 hybrid target touching the lands in a .180 freebore.

View attachment 640875

I seated .020 off for the pressure testing and shooting the barrel in a little initially.
View attachment 640876

That is great info on the freebore length. do you know the reamer spec as far as freebore diameter? It makes a difference getting to the lands. Is it .2645 or .2650 or ? Does anyone else have any reamer specs to share? any info appreciated. I need to get a reamer ordered.

 

[Huntnful]

That is great info on the freebore length. do you know the reamer spec as far as freebore diameter? It makes a difference getting to the lands. Is it .2645 or .2650 or ? Does anyone else have any reamer specs to share? any info appreciated. I need to get a reamer ordered.

I have no idea honestly. High Voltage Armory has the reamer and did the build.

 

[lee264]

Great insight. Thank you!

I have 64gr. - 70gr. loaded up with both H1000 and N565 with 140 hybrids

I would be careful with that 70 grain charge. My 264 is throated long and I run into pressure around 71 grains of Retumbo with 140s. The 264 case has a bit more case capacity than the 7 PRC case.

 

[scottw2119]

My reamer was set up for the 156 and the ones I have built all liked the n565 and was pushing the 156 right at that 3200 mark.