Working up 1st 7PRC Load ... hmmm

[P7M13]

Which bullet?

Nosler 185 RDF / Converted Hornady 375 Ruger brass.
2.695 B2O
The best node was 65.5gr H4831, 2900 MV
Light ejector marks at 66.2gr
Heavy bolt lift at 67gr.
Remington action / McGowen Remage barrel, 26" IIRC twist = 1:8

 

[todd458]

Interesting data: thanks for sharing.
I have a Tikka 7PRC with a 22" Preferred Barrel Blanks barrel. With the factory 175 eldx I was running 2895-2905fps instead of the listed 3000fps. I know, just like yours, the shorter barrel impacts the velocity, but I plan on hunting suppressed with this build so I'm okay with the shorter barrel.
Hope to see more results as you work the groups for both rounds.

I ended up with 28 77 ft./s with the 162 grain. 175 was showing ejector marks at 2770 ft./s. we opted for the 162s and 100 ft./s gain. This is out of a 20 inch benchmark.

 

[todd458]

Work up for my load. Like I said the 175 ELDX shot wonderful out of it.(factory)All under 1/2 MOA. 162's no different.( quite a few .02's-to 0.4's)Just opted for a little more speed. Funny thing is,the 175eldx @ 100ftps slower catches the 162eldx at around 6 to 7 hundred yr. Can't remember exactly

 

[todd458]

Couple of duplicates in there I apologize

 

[Brad Quarnberg]

nice groups: great shooting!

 

[TxHeartShot]

Working up my 1st 7PRC load. Shooting a Tikka with a 20" CarbonSix barrel. I am in California, so have to stick to Mono, thus trying the 160CX and 168 LRX. Have a couple powders, but everything seems to be saying "Try H1000, then something else if that doesn't work" ...

At this point I did a 16 shot ladder @ .3g increments:

160CX was:

Charge	Velocity
67.5	2808
67.8	2821
68.1	2830
68.4	2826
68.7	2848
69.0	2852
69.3	2869
69.6*	2894
69.9	2906
70.2	2875
70.5	2926
70.8	2931
71.1	2943
71.4	2949
71.7**	2995
72.0	2974

*Hornady Load Data had H1000 Max load at 69.5 @ 3100fps ... So I am essentially 200 fps below
** I got ejector marks on this one


168LRX

Charge	Velocity
64.3	2638
64.6	2610
64.9	2659
65.2	2642
65.5	2716
65.8	2707
66.1*	2749
66.4	2772
66.7	2755
67.0	2744
67.3	2850
67.6	2865
67.9	2861
68.2	2847
68.5	2909
68.8	2888

* Hogdon load data for the Barnes has Max Load @ 66.0 @ 2995 fps ... So, I look to be 250 fps below

I did not see any signs of pressure, in that ladder, even though I went almost +3g above Max

I was hoping I'd get something that would be a 700-800y gun, even with that barrel, given the hype of the 7PRC for performance. I am figuring out that I may not have realistic expectations ...

I have decided to try groups for:
- 168 LRX @ 67.9
- 160 CX @ 71.1

We'll see if either of those get near the 1/2 MOA CarbonSix says their barrel shoots. Which ever can get < 3/4 MOA, I'll likely go with. If neither, then will see what the factory 160CX groups at, and reassess from there.

I think that will shoot 800 yards...

 

[Muledeerhuntingfreak]

Interesting data: thanks for sharing.
I have a Tikka 7PRC with a 22" Preferred Barrel Blanks barrel. With the factory 175 eldx I was running 2895-2905fps instead of the listed 3000fps. I know, just like yours, the shorter barrel impacts the velocity, but I plan on hunting suppressed with this build so I'm okay with the shorter barrel.
Hope to see more results as you work the groups for both rounds.

Remember after barrel break in. It can take up to a couple 100 rounds. Then you're barrel, speed will speed up

 

[letzhunt]

I don't recall reading the round count from the OP on the barrel. Should get an increase in velocity after 100-200 rounds. Keep shooting what works and what you can source and measure velocity along the way....you may get there without changing anything but number of rounds down the tube. In my experience the monos effect this more....but that may just be an anomaly.

 

[NorCalAOSHunter]

I don't recall reading the round count from the OP on the barrel. Should get an increase in velocity after 100-200 rounds. Keep shooting what works and what you can source and measure velocity along the way....you may get there without changing anything but number of rounds down the tube. In my experience the monos effect this more....but that may just be an anomaly.

This gun was brand new, and when I originally posted it probably 20 or 30 rounds, I'm at about 130 rounds to the barrel currently

 

[letzhunt]

you should gain up to 100 fps......I did in my 7PRC and that was with factory CX 160.....it happened around the 200 round mark though.

 

[jfield]

I'm curious what a 145 LRX would zip along at with that caliber.

My 7rem Mag with the 145 LRX gets 3100 with 7828 SCC. 26" barrel

 

[Small Lady]

280 rounds through my 7prc now, it shoots faster, and more accurately, it easily shoots 3/8" moa @100 yards.

 

[Muledeerhuntingfreak]

I don't recall reading the round count from the OP on the barrel. Should get an increase in velocity after 100-200 rounds. Keep shooting what works and what you can source and measure velocity along the way....you may get there without changing anything but number of rounds down the tube. In my experience the monos effect this more....but that may just be an anomaly.

On this web forum, there's actually a guy who is an expert about barrel break in Yada. Read that one, it tells you everything.
He explains everything in detail.

 

[TX Punisher]

I need some 4831sc it appears.