7 prc chrono

[Mtank79]

I had a few minutes this morning & was able to use my garmin chrono for the first time. I saw several videos about how the velocity is way off on the 7 prc’s, I only shot the Barnes 160 LRX factory loads today but 5 shot average was 3066.9 & advertised velocity is 3050. I have some norma 165 bond strikes to try next . The rifle is CA Ridgeline 24” 7 PRC. The only thing I’ve changed is I swapped the radial brake for their side baffle.

 

[V00D00]

why would the chrono be off on 7prc? what are they saying is the cause? lots of rifles out there with more velocity with no issues.

 

[Dave Thomas]

I think he meant that the actual velocity doesn't always match what the box claims. At least that's how i understood it.

 

[WeiserBucks]

I think he meant that the actual velocity doesn't always match what the box claims. At least that's how i understood it.

That's almost universally true of all factory ammo.

 

[Mtank79]

Yes sorry if I misspoke. Thinking back I think most complaints were with the Hornady ammo & this gun & Hornady don’t get along.

 

[Mtank79]

This is from my seekins 6.5 prc shooting Hornady 143 & 147s.

 

[Long84]

I believe that the velocity issue was with Hornady factory ammo. They were a couple hundred feet per second slower than the velocity printed on the box.

 

[hiker270]

Interested to see what fps the Norma Bondstrike puts out. Haven't tried them in my 7PRC but my Tikka 6.5 PRC shoots the 143 Norma Bondstrike under MOA. Gonna use these in the 6.5 PRC in Colorado on my elk hunt in a couple weeks. And for some reason Hornady ammo usually chrono's slower than advertised.

 

[Mtank79]

Interested to see what fps the Norma Bondstrike puts out. Haven't tried them in my 7PRC but my Tikka 6.5 PRC shoots the 143 Norma Bondstrike under MOA. Gonna use these in the 6.5 PRC in Colorado on my elk hunt in a couple weeks. And for some reason Hornady ammo usually chrono's slower than advertised.

I also have the 143’s for my 6.5 prc but haven’t tried them yet.

 

[Mtank79]

Interested to see what fps the Norma Bondstrike puts out. Haven't tried them in my 7PRC but my Tikka 6.5 PRC shoots the 143 Norma Bondstrike under MOA. Gonna use these in the 6.5 PRC in Colorado on my elk hunt in a couple weeks. And for some reason Hornady ammo usually chrono's slower than advertised.

So I tried the bondstrikes out today. Group wise they were total opposites. The 7 prc shot terrible but the 6.5 prc shot very well. One thing that threw me was I had a 4.26” poi change after taking the radial brake off. I expected some change but wasn’t anticipating over 4”.

 

[Scout1]

I cronographed my Weatherby Alpine 307 in 7mm PRC yesterday with Hornady 175gr. ELD-X factory loads. I had 2 different lot numbers and did 5 shot averages thru my Garmin zero. 2810.1 was the average for both boxes. I also cronoed the Federal Fussion 175gr with an average of 2812.5 thru my rifle. I don't have more than 80 rounds thru it yet, hopefully it speeds up a little.

 

[Mtank79]

I have some Hornady 175s I will try them today & see what I get. Round count for mine is around 50. What length barrel is on your 307?

 

[TaperPin]

why would the chrono be off on 7prc? what are they saying is the cause? lots of rifles out there with more velocity with no issues.

The 7PRC is said to have been developed to be ideal with RL26. The parent company of Federal also owns the makers of RL26, and when international demand for powder went up (Ukraine war), $$$ lucrative military contracts were prioritized over USA consumers and that powder stopped being supplied to Hornady (and the public), so original published velocities abruptly dropped.

 

[V00D00]

The 7PRC is said to have been developed to be ideal with RL26. The parent company of Federal also owns the makers of RL26, and when international demand for powder went up (Ukraine war), $$$ lucrative military contracts were prioritized over USA consumers and that powder stopped being supplied to Hornady (and the public), so original published velocities abruptly dropped.

yes ive read all about that. i thought he meant the chrono wasnt giving accurate readings

 

[Scout1]

I have some Hornady 175s I will try them today & see what I get. Round count for mine is around 50. What length barrel is on your 307?

22"

 

[Pilsner]

Hornady factory 180's out of a 20" barrel were giving us 2550 FPS at 2375' elevation.