Cz varmint grendel pressure ladder

[A5BLASTER]

Lil pressure ladder data for y'all to check out.

Ran this yesterday

123 eld-m
Cci450
PPU 1x fired brass
Ar-comp-ladder 25 to 28.8 in 2 tenth increases per charge at 1 round each

Coal-2.280
Jump-25 thousands
Contact-2.305

25-2380
25.2-2401
25.4-2411
25.6-2415
25.8-2437



26-2463
26.2-2483
26.4-2491
26.6-2520
26.8-2522



27-2558
27.2-2565
27.4-2583
27.6-2600
27.8-2603



28-2634
28.2-2651
28.4-2659
28.6-2667
28.8-2680





Noticed something once I got home about these data points. Hopefully y'all can see it as well.






Second test ladder from yesterday.



Starline-3x fired
Cci450
H4895- ladder from 25.5 to 29.4 in 3 tenth increases, 1 round per charge
Coal-2.300
Contact-2.380
Jump-80 thousands



25.5-2333
25.8-2346



26.1-2357
26.4-2372
26.7-2392



27-2422
27.3-2428
27.6-2441
27.9-2460


28.2-2461
28.5-2495
28.8-2511


29.1-2515
29.4-2532




Really likeing this ar-comp and h4895 in my bolt grendel.

Will be rerunning these ladders again next weekend and if they track the same, then I will sit down and load some rounds for group testing.

[A5BLASTER]

Lol so nobody see's that the ar-comp 123 eld-m data shows a possible node in every charge range?

[Tex74]

I see the potential, especially at 26.6-26.8 and 27.6-27.8 is where I would reload , 26.7 and 27.7 and shoot for accuracy

[kmon]

Just looked at it and see what you are talking about. First quick read tolm I would definitely try a load of AR comp at 27.7 and give it a try, I have had good luck trying a node indicated that way going smaller steps and find the one in the middle often is where to be.

[A5BLASTER]

Just looked at it and see what you are talking about. First quick read tolm I would definitely try a load of AR comp at 27.7 and give it a try, I have had good luck trying a node indicated that way going smaller steps and find the one in the middle often is where to be.

Yea I intend to rerun this ladder again, just to be sure it wasn't a fluke.

I typically find the flat area in speed and then bracket it with 10 rounds at each charge.

Five for a group and five for the velocity data.

Then I pick the one with the best sd and es and try some 5 shot groups at diffrent seating depths.

Just thought it strange that it showed so many potential accuracy nods. Never heard or seen it have more then 2 nods before.

[Bobke]

Really liking ARC. See that you’re running PPU brass for one ladder, Starline on other. Thought about running a limited string of ARC in the Starline to reconfirm data points? Have seen POI changes when moving between Lapua and Hornady brass, given about 6-7 grains difference in case weights. Continuing interest in your results.

[A5BLASTER]

Really liking ARC. See that you’re running PPU brass for one ladder, Starline on other. Thought about running a limited string of ARC in the Starline to reconfirm data points? Have seen POI changes when moving between Lapua and Hornady brass, given about 6-7 grains difference in case weights. Continuing interest in your results.

Yea I use the Starline and PPU brass for my bolt action only.

And I don't move the load between brass. If it's worked up on PPU that's the only brass it's fired from, if it's worked up on Starline that's the only brass it's fired from.

In my bolt grendel I use the Starline for the heavy bullets and the PPU for the 123 grain and lighter weight bullets.

[garyrapp55]

A5Blaster, I know it's still early as there are only 2 fires on your PPU brass but do you have any insight/opinion to share about reloading it? From your similar thread about it, I gather the volume/case capacity is less than Hornady. Did you see any pressure signs because of this?

[A5BLASTER]

A5Blaster, I know it's still early as there are only 2 fires on your PPU brass but do you have any insight/opinion to share about reloading it? From your similar thread about it, I gather the volume/case capacity is less than Hornady. Did you see any pressure signs because of this?

Still gathering Intel on it. Will wait till I have atleast 5 firings on it before I give my full thoughts on it.

I will say this. That string above with the 123 eld-m and ar-comp showed zero pressure signs. But remember this is in a bolt action and not a ar grendel.

In the AR grendel that load is probably HOT but in my CZ it was very well mannered and behaved.

That's anouther reason I want to rerun that ladder again.

[A5BLASTER]

So more data for you gents to chew on.

Did some more testing with the above listed loads, Saturday reran the ladders and everything tracked as expected except for one thing.

The h4895 ladder was exactly 100 fps faster for every charge then last weekend. So stopped and ran some factory ammo to make sure something wasn't going haywire with my magneto speed. All factory ammo checked out and so did the ladder test with the ar-comp. So I proceeded slowly and couldn't find anything pressure wise out of line other then the fact the h4895 loads tracked exactly 100 fps faster for each charge then it had the weekend before.

Here is the data from groups I shot Sunday. Loaded 10 shots at each charge. 5 for velocity and 5 for a testing group.

All groups were shot on cold bore. Didn't take pics, will be shooting groups again this weekend at my chosen loads with diffrent seating depths to finalize my loads.

Brass-ppu 2x fired
Cci450
123 eld-m
Coal-2.280

27.6
Avr-2614
Hi-2622
Lo-2605
Sd-6
Es-17




27.8
Avr-2625
Hi-2633
Lo-2615
Sd-7
Es-18
This load grouped 5 shots at 1/2 at 200 yards. Planing on calling it good and stacking this deep.


28.2
Avr-2663
Hi-2674
Lo-2645
Sd-12
Es-29



28.4
Avr-2683
Hi-2697
Lo-2672
Sd-9
Es-25




28.6
Avr-2693
Hi-2707
Lo-2683
Sd-10
Es-24 this load showed the only pressure signs I have seen yet. It had a very slight extractor mark.



Next up is the 129 ablr h4895 load.

Brass-starline 4x fired
Cci450
129ablr
Coal-2.300




28.8
Avr-2611
Hi-2628
Lo-2598
Sd-12
Es-30





28.9
Avr-2625
Hi-2647
Lo-2609
Sd-13
Es-38






29
Avr-2620
Hi-2628
Lo-2614
Sd-5
Es-14






29.1
Avr-2628
Hi-2634
Lo-2626
Sd-3
Es-8. Shot 5 rounds at 1 1/4 at 200 yards, going to try a seating length change




29.2
Avr-2636
Hi-2644
Lo-2630
Sd-7
Es-14 shot a 1 1/4 5 shot group as well.


None of the h4895 rounds showed any signs of pressure.

The highest charges of both loads are compressed and these loads are over sammi max pressure even though they don't show the signs on the brass.

These loads are safe in my rifles and only bolt action rifles, do not attempt in a ar15 grendel.

[grayfox]

I may have to try some of the h4895 in my RAP. Would be using Hdy brass though; having a longer coal I think will help in good feeding to the chamber...

[A5BLASTER]

I may have to try some of the h4895 in my RAP. Would be using Hdy brass though; having a longer coal I think will help in good feeding to the chamber...

I'm really liking the h4895. Wish the CZ mags had the room the howa mags have. CZ mags max out at 2.315ish.

[A5BLASTER]

So just back from the range. Took my 27.8 load with the 123 eld-m and ran with it.

Shot it at 200,300,400 and 500 yard steel just having a blast, figuring out holdoffs for the wind.

We have a big storm system hitting here later today, so the wind was up way past 10 miles an hour and very unpredictable.

Then I decided to do something very crazy, took that load and decided to try for some groups at 600 yards.

Can't get the pic from the first group to size down enough but here is the pic from my second try.

I went down and got a pic of my first four round group. Had fired 6 rounds during that first attempt and ended up with a 4 round 3 1/4 vertical and bout 1 1/4 horizontal group.

So I went back to the bench and shot 10 rounds on my second attempt. I admit I jacked up a few shots and the wind had changed between groups and I was failing to see that. Got down to 4 rounds leavt and stopped and gave myself some time to settle into a good position and get a better feel for the wind at 600.

The pic shows my last 4 shots.

Ppu brass-4xfired now
Cci450
123 eld-m
Ar-comp-27.8
Coal of 2.280

Will have to retry this again when the weather and wind is more stable. But overall I'm happy with it.

Even more so since that's the first time I ever tryed to shoot a bonifed group on paper at 600 yards.

[LRRPF52]

So this new PPU Small Rifle Primer brass is holding up well at 4x fired?

Can you take some good close-up macro shots of the 4x fired brass before it's de-primed?

That's good news you're getting these kinds of results with it, and the accuracy is looking like 1/3 MOA or less for that 4rd group, provided there aren't any other rounds outside of that.

Are you double-seating with a turn for concentricity during your seating process?

[A5BLASTER]

So this new PPU Small Rifle Primer brass is holding up well at 4x fired?

Can you take some good close-up macro shots of the 4x fired brass before it's de-primed?

That's good news you're getting these kinds of results with it, and the accuracy is looking like 1/3 MOA or less for that 4rd group, provided there aren't any other rounds outside of that.

Are you double-seating with a turn for concentricity during your seating process?

Yea it's holding very well.

Once I have 5 firings on it I will give my full thoughts on the brass.

Yep I double seat everything.

Yea there is rounds outside of that group but they were fired before had. That 4 round group was my last 4 rounds of the day. I had to stop and reevaluate the wind, once I had it figured out I layed down that 4 round group.

These average just over 2600 from this barrel, no pressure signs on the brass are the primer, case messurments have shown no out of line are abnormal swelling at the web are strange growth of the case length.

I'm sure it's over sammi max but it has been a very well mannered load. Sd and es could be a lil better but for a cheap plinking load and backup hunting load. I'm pleased with it.

The real sweetheart load is the 129 ablr and h4895 load but I'm not finished fine tuneing it yet.