Group analysis from the LR Experts

[kjd]

Sound advice guys.

There is some SAKO brass here which I suspect is Norma made? I was thinking of getting that but will await your responses.

I did some more loading last night with the following specs:

Federal 210 Match LR Proj, 178gr Amax, Rem Cases (I know) and 2213SC at 73gr 74gr 74.5gr and 75gr.

What do you blokes think?

[Camel]

Reckon they will o bang when you want them to mate, about the only certainty with these gun things, you know that.

[mick_762]

except when you have a primer flip over in the tray

[Camel]

except when you have a primer flip over in the tray

Guilty of that one, several times.

[Rinso]

Sounds like a good range of loads Keith.
I have found Norma brass to be a bit light for heavy loads. I used some when I first developed the 260AI I built and found that primer pockets did not survive more than 3 shots at best, one of those was a fire forming load as well. So I would suggest that unless its cheap I would stay with the Rem for now.

[kjd]

Reckon they will o bang when you want them to mate, about the only certainty with these gun things, you know that.

Thats it mate it just depends on how big of a bang. I will be 2gr Over Max load from the ADI book. Even at 75gr though there is still room in the case for more powder and I haven't gotten any pressure signs yet. . We'll find out shortly I guess.

[trevort]

[. We'll find out shortly I guess.

if you fire the high loads with string tied to the trigger can you take some video

Please

[kjd]

[. We'll find out shortly I guess.

if you fire the high loads with string tied to the trigger can you take some video

Please

Just had a flick through uncle nick's book he reckons his max is 75gr. ADI is either too conservative or Uncle Nick is off his rocker! My money is on the multinational company erring on the side of caution.

[a.JR]

Hi Kjd, In my 300wm wildcat(2gns less capacity than std) i have run 77.5 to 79.5 of 2213sc or vv560 with a 187bib FB.. I see no reason a production action cannot withstand 75 of sc with a 175 BT projectile .. Sneak up with those lower charges and at operating temperature measure each case after firing .. When you reach a full 1 thou increase in dia at the belt after one shot on a fired case then you really have reached the strength of that brand of brass and you should stop there .. I always take the 5 worst pieces of brass from the lot through to destruction in the work up stage as i have to know where it gives up the game for future reference.. Hope this helps..JR..Jeff Rogers

[kjd]

So I got out to do more testing here are the results:

Conditions were still sunny and a bit of mirage.
The 73 and 74gr loads were in the high 2700fps
The 74.5 were on the mid 2800's and the 75gr averaged out at 2900fps.

No pressure signs still but I think the 75 gr load may be worth sticking to got our top 700yds or so. I feel the horizontal spread was likely my doing in the mirage.

Would love the experts opinions.

[justjeff]

Keith,

You have another node, at 75, there will be another one somewhere near 78, but your brass might not get there. Retest the 75 load, with flags. Since you are stuck for seating depth re mag length, try seating a little deeper, it may help, but may not either. You may also try a few different primers with that powder charge. Other than that, it's minute of bambi at 500 m no worries.
Looks pretty good to me as it is.

Jeff

[kjd]

Thanks Geoff I might load up the remainder of my brass with that load and do some longer range groups and enjoy the rifle for a bit and if I think it is lacking I'll revisit the load..

[trevort]

Looking good

[Tony Z]

69.5 and 75 are your nodes Keith. Only aJR and his belt/primer pocket recovery die can get to the third node
Jeff H and i had this discussion a little while ago about the "new" ADI powders. They all seem hotter than what older batches were. 2208 is 2207.5, 2209 is 2208.5, SC is somewhere between 09 and the older SC batches. 2217 seems to be the only one still what it was. So it is no surprise that you are down on powder for the next node.
I wouldn't worry too much about the speed as chronos lie like politicians. Real world emperical data can give you the true speed. Just calibrate your scope at 100yds for true MOA value and work the minutes of elevation to 700 m/yds to interpolate the velocity. A google search should find you a real world BC for those pills or maybe a search over on BRC or Accurate Shooter. Quoted BCs from the manufacturer are also like politicians. Figures plucked from thin air or from a computer model. Don't forget direction when your shooting. North south is great but east west will give you an error of plus or minus 3/4 MOA at 700 meters.
Actually justjeff can give you the real world BC from his blue book of propaganda and conjecture. It has a full list of just about every pill used in LR.

[Rinso]

As others have said the 75grn load looks ok, if you want to sit back and run that you should get good results for a good while. I would suggest you stock up on powder from that batch, in fact all your components for that load from the same batches. You will get thousands of rounds of hunting from that barrel so they wont go to waste.