7mm PRC starting load Please

[WAR308]

i'm sure we all remember way back when you know 2017 when primers were 3 1/2 cents apiece

 

[highfinblue]

Did you try n560? I found that to be pretty good in the shorter 6.5s.. n565nas well. Theb7prc i just finished is a 23inch barrel and 180s are doing 2960 with h1000.. shoots literally 1 hole @100 .. next charge up shot well under 1/2 minute as well at nearly 3k

What was your COL for your load. I've been trying 162's, and 175's, and I'm just now past fifty rounds, but I'm definitely not seeing the accuracy I was hoping for. The lands are so far out I'm not sure if I can find them with anything other than maybe a 195, and I was really hoping to shoot lighter bullets a bit faster.

 

[kaseyfied]

What's your coal??

 

[highfinblue]

i have always wondered if going to a quicker powder would do better in the shorter barrels, but haven't seen the correlation with other guns so not sure. Any thoughts or experience on that?

I've only tested H1000, but I'm getting 2875 with 175 Hornady's and 2960 with 162's, but so far the accuracy is less than I'm satisfied with, right at MOA at 100, my barrel is 22", 9 twist.

 

[WAR308]

I've only tested H1000, but I'm getting 2875 with 175 Hornady's and 2960 with 162's, but so far the accuracy is less than I'm satisfied with, right at MOA at 100, my barrel is 22", 9 twist.

There appears to be a larger FPS jump from 20" to 22" (anecdotally) of about 75-80 fps which is a little higher than many predicted test averages. The 1:9 twist is different, I thought the spec on the 7PRC was 1:8 which the 9 might give a hair more speed but wobble out of the heavies (maybe not either I'd say a toss up have to just try them out) , but then it's hard to get the COL out far enough for accuracy off the lands.

On my gun which is a 20" it doesn't seem to care if I'm up near the lands or just set them off as the 160's AB are about as good at the 175 ABLR's in accuracy. Every barrel and brand is different, but the 22" just seems to give the best chance to push the speed a hair more and get good accuracy but that's all just a guess at this point.

 

[highfinblue]

There appears to be a larger FPS jump from 20" to 22" (anecdotally) of about 75-80 fps which is a little higher than many predicted test averages. The 1:9 twist is different, I thought the spec on the 7PRC was 1:8 which the 9 might give a hair more speed but wobble out of the heavies (maybe not either I'd say a toss up have to just try them out) , but then it's hard to get the COL out far enough for accuracy off the lands.

On my gun which is a 20" it doesn't seem to care if I'm up near the lands or just set them off as the 160's AB are about as good at the 175 ABLR's in accuracy. Every barrel and brand is different, but the 22" just seems to give the best chance to push the speed a hair more and get good accuracy but that's all just a guess at this point.

Seems like some of the guys are getting better accuracy with H4831SC with the smaller pills. I believe I have some in my cabinet, that's probably going to be next before I try to shoot the heavier bullets. I tried to get away without spending a chunk of change so I bought a Bergara Sierra Wilderness I believe it is called, nice looking stock, 22" barrel, threaded, I love suppressors, nice trigger for factory, generally I put a TriggerTech Diamond in everything 700 clones, but this breaks at a clean 2 pounds. I can live with that in a hunting rifle, and I've shot six times at 500 yards with two different loads and kept them in the kill zone for a whitetail, but I really would like to see things tighten up a bit. I don't know where the lands are at on this thing, but worst case scenario if it won't ever shoot another barrel isn't as much as a custom rifle.

 

[WAR308]

Seems like some of the guys are getting better accuracy with H4831SC with the smaller pills. I believe I have some in my cabinet, that's probably going to be next before I try to shoot the heavier bullets. I tried to get away without spending a chunk of change so I bought a Bergara Sierra Wilderness I believe it is called, nice looking stock, 22" barrel, threaded, I love suppressors, nice trigger for factory, generally I put a TriggerTech Diamond in everything 700 clones, but this breaks at a clean 2 pounds. I can live with that in a hunting rifle, and I've shot six times at 500 yards with two different loads and kept them in the kill zone for a whitetail, but I really would like to see things tighten up a bit. I don't know where the lands are at on this thing, but worst case scenario if it won't ever shoot another barrel isn't as much as a custom rifle.

Can order a case gauge or do what I do is a redneck (I'm in the south so I might be an old one) solution: take a sacrificial brass case that has been resized, cut a dremel cutoff wheel width slot into it about 1/4" or just to the bottom of the next at the shoulder, keep it tight for a bullet that you can just barely set into about 1/8" by hand. Then open bolt, slide the case and bullet in slower until you can close the bolt, open slowly, pull out bullet and measure the COL which should get you close to the max length for that brass and bullet style. I do it about 3 or 4 times and take an average. you may have heard of this, but it's what I've done before when I didn't want to wait on a gauge.

Agree on using the 4831 for the lighter pills, I'll do the same with `140's and 150's just to see how it stacks up to RL22, H1000, and Staball HD in those weights. Next up will be N560/565/570 for 150's to 175's to see how each performs in my 20"