280 AI 168 gr ABLR

[JD338]

It took some time I finally found a load for the 168 gr ABLR in the 280AI.
I will reshoot to verify accuracy.

JD338

 

[6mm Remington]

Holy crap Jim that is great!! I might have to work up to that load in my .280 AI. I was looking at getting IMR7828SC just for the .280 and it looks like its a good one!! Is that a Federal 215 Gold Match magnum primer you used?

 

[DrMike]

That looks to be a mighty fine load and some excellent riflery, Jim. A load such as that can become the stuff of envy for us lesser mortals. Congratulations.

 

[shoots_5]

Outfreakingstanding!

 

[FOTIS]

This is the nosler rifle? Sue's rifle right?

 

[JD338]

This is the nosler rifle? Sue's rifle right?

No, my custom M700 Hart barreled rifle. Scoped with a Mark 4 45-14x40mm.
I'm thinking this would hit hard out to 800 yds.

JD338

 

[6mm Remington]

The Ackley has some teeth!! Bites hard!

 

[IdahoCTD]

That's some good shooting Jim.

 

[JD338]

Thanks fellas. As most of you know, this rifle is a shooter.
I was getting frustrated that I couldn't do much better tban 1-1.25".
Kind of funny as Sue was watching through the spoofing scope and
said I missed my second and third shots. I'm glad that she was able
to watch the old boy stack 'em. Of course she also
wanted to know when her M48 280AI would start
stacking 'em too.

JD338

 

[Dwh7271]

Wow. Great shooting! Sweet load Jim.
You may have created a monster now that Sue saw that. :grin:

 

[muzz]

Nice work!!!

I might have to give them a try one day. That is some fine shooting sir!

 

[DrMike]

Of course she also wanted to know when her M48 280AI would start stacking 'em too.

JD338

All in good time, Jim; all in good time.

 

[STW]

You can't improve on that. Nice work!

 

[Ridgerunner665]

Looks like you just might be on node 5 at 1.23 ms (+/- 2%)...

If for some reason you decide to tweak it...I'd tweak it up a 1/2 grain...but you're within 2% right where you're at from the looks of things.

Glad you found one that works!

Below is not perfectly matched to your rifle, I don't know your case capacity...but probably closely guesstimated.

Cartridge          : .280 Ack Imp
Bullet             : .284, 168, Nosler Accubond LR 58623 G7
Useable Case Capaci: 64.551 grain H2O = 4.191 cm³
Cartridge O.A.L. L6: 3.394 inch = 86.21 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 7828 SSC

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.841% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-08.4   89    54.50   2590    2502   41917  11264     94.7    1.417
-07.6   90    55.00   2615    2551   43086  11378     95.2    1.398
-06.7   91    55.50   2641    2601   44292  11490     95.6    1.380
-05.9   92    56.00   2666    2651   45527  11598     96.0    1.362
-05.0   92    56.50   2691    2701   46809  11703     96.3    1.345
-04.2   93    57.00   2716    2752   48125  11805     96.7    1.327
-03.4   94    57.50   2742    2804   49481  11903     97.0    1.310
-02.5   95    58.00   2767    2856   50879  11999     97.4    1.293
-01.7   96    58.50   2792    2908   52320  12090     97.7    1.276
-00.8   97    59.00   2817    2961   53804  12178     98.0    1.260
+00.0   97    59.50   2843    3014   55336  12262     98.2    1.244  ! Near Maximum !
+00.8   98    60.00   2868    3068   56915  12343     98.5    1.228  ! Near Maximum !
+01.7   99    60.50   2893    3122   58544  12419     98.7    1.212  ! Near Maximum !
+02.5  100    61.00   2918    3177   60224  12492     98.9    1.196  ! Near Maximum !
+03.4  101    61.50   2944    3232   61959  12560     99.1    1.181  ! Near Maximum !
+04.2  101    62.00   2969    3287   63750  12624     99.3    1.166  ! Near Maximum !

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba     97    59.50   2922    3185   61176  12195     99.7    1.192  ! Near Maximum !
Data for burning rate decreased by 5% relative to nominal value:

 

[NWBlacktail]

Wow!

Another 280AI load using mag primers. Hmmm, I bought a brick of 210's just for a 280AI build. Maybe I was mistaken.

I'd really like to try the 168 grn ABLR, but I'm a bit concerned about the supply line. Hopefully we start seeing more on the shelves. The 168 grn Bergers look like a good VLD style bullet as well.

Really great shooting!

 

[Ridgerunner665]

A test of the "node theory"...try the same load in her rifle...you can check it for yourself, but the Nolser will have the freebore to handle that OAL (mine does).

I've only taken some crude measurements (don't have proper tools to do it accurately)...but all indications are that the freebore is generous in the 48...I don't think you'll get anywhere near the rifling at mag length (3.425"), especially not with ABLR's or VLD's.

SAAMI spec freebore is .179"

 

[nvbroncrider]

Jim,

How far off the lands?

I've been in the same boat 2 in 1 out. And the two in have been stacked just like that.

I'm at 3.550" to the lands on my rifle. I've ran them as short as 3.435" so far.

Jake

 

[muleman]

Jim,

How far off the lands?

I've been in the same boat 2 in 1 out. And the two in have been stacked just like that.

I'm at 3.550" to the lands on my rifle. I've ran them as short as 3.435" so far.

Jake

Ditto on that question.
Scott

 

[preacher]

Sweet! I made it to 2750 in my .280 , though not as pretty a group! I was impressed with that bullet, long and sleek.

 

[sask boy]

Jim that load is Sweet and as usual your shooting ability amazes me. I was wondering if you wanted to make a trip up here for a few days and give this lefty a few pointers .
Thank you for posting that :wink:!

Blessings,
Dan