Loading for the 280 Ackley...

[Ridgerunner665]

Thanks for the kind words fellas...I'm about tuckered out... Lol.

Also meant to mention... The Zeiss HD5 performed flawlessly...the tracking is prefect.

I dialed it every which way but loose and it went right back to zero every time... and if I dialed it 18 MOA up, it impacted exactly 18 MOA up.

 

[Ridgerunner665]

Also forgot to mention that, so far....all loads shoot to the same POA/POI at 100 yards.


But I've only shot 2 different loads at a target.

 

[SJB358]

That's awesome! Either of those two loads would handle about anything you point it at.

 

[nvbroncrider]

Can't beat that buddy. We need pictures!!! Sounds like one slick rifle. I almost bought one 2 years ago in 9.3X62 but didn't have the cash at the moment.

 

[Ridgerunner665]

 

[DrMike]

Very handsome, RR. It has to put a grin on your chin each time you handle it.

 

[nvbroncrider]

Dang that's a slick rig. Thanks for satisfying my cravings for the day. Now I can go to sleep.

 

[Hegland]

Either of those two loads would handle about anything you point it at.

And the rifle looks all business, too. Very nice RR.

 

[JD338]

Looking good Roger You have two great loads, the 150 gr ABLR at
3100 fps for everything and the 160 gr PT at 2950 fps for big bones and tough hide.

JD338

 

[Ridgerunner665]

Can somebody run a QL for me using RL26, 150 ABLR, 3.34" OAL, 73.9 capacity, 24" barrel...I have ordered the new QL update but don't have it yet...I'm curious to see the barrel time.

 

[DrMike]

Cartridge : .280 Ack Imp
Bullet : .284, 150, Nosler AccuBond LR 58734 G7
Useable Case Capaci: 65.334 grain H2O = 4.242 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Alliant Reloder-26

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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

-20.0 82 53.04 2479 2047 29997 10798 94.3 1.566
-18.0 84 54.37 2548 2163 32231 11128 95.6 1.524
-16.0 86 55.69 2618 2282 34649 11432 96.8 1.482
-14.0 88 57.02 2687 2405 37267 11709 97.7 1.439
-12.0 90 58.34 2756 2531 40108 11955 98.6 1.390
-10.0 92 59.67 2826 2659 43190 12169 99.2 1.342
-08.0 94 61.00 2894 2790 46539 12349 99.7 1.296
-06.0 96 62.32 2963 2923 50183 12492 99.9 1.252
-04.0 98 63.65 3030 3058 54155 12597 100.0 1.209
-02.0 100 64.97 3097 3195 58489 12683 100.0 1.168 ! Near Maximum !
+00.0 102 66.30 3164 3334 63228 12764 100.0 1.128 ! Near Maximum !
+02.0 104 67.63 3229 3474 68411 12840 100.0 1.090 !DANGEROUS LOAD-DO NOT USE!
+04.0 106 68.95 3295 3616 74040 12911 100.0 1.054 !DANGEROUS LOAD-DO NOT USE!
+06.0 109 70.28 3360 3760 80178 12975 100.0 1.018 !DANGEROUS LOAD-DO NOT USE!
+08.0 111 71.60 3425 3907 86888 13034 100.0 0.984 !DANGEROUS LOAD-DO NOT USE!
+10.0 113 72.93 3489 4056 94238 13085 100.0 0.951 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 102 66.30 3301 3629 79958 12210 100.0 1.032 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 102 66.30 2950 2898 48741 13201 98.0 1.259

 

[Ridgerunner665]

Thanks Mike...


4 more grains of powder for no more speed (same barrel time)...

Cartridge : .280 Ack Imp
Bullet : .284, 150, Nosler AccuBond LR 58734 G7
Useable Case Capaci: 65.445 grain H2O = 4.249 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Norma MRP ?

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.807% 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

-08.1 91 57.00 2877 2758 48701 11742 99.6 1.277
-07.3 91 57.50 2902 2805 50067 11808 99.7 1.261
-06.5 92 58.00 2927 2854 51469 11870 99.8 1.245
-05.6 93 58.50 2952 2902 52911 11928 99.9 1.230
-04.8 94 59.00 2976 2950 54392 11981 100.0 1.214
-04.0 95 59.50 3001 2999 55915 12030 100.0 1.199 ! Near Maximum !
-03.2 95 60.00 3025 3048 57480 12075 100.0 1.184 ! Near Maximum !
-02.4 96 60.50 3049 3097 59089 12117 100.0 1.170 ! Near Maximum !
-01.6 97 61.00 3074 3146 60744 12159 100.0 1.155 ! Near Maximum !
-00.8 98 61.50 3098 3196 62445 12200 100.0 1.141 ! Near Maximum !
+00.0 98 62.00 3122 3246 64195 12240 100.0 1.127 ! Near Maximum !
+00.8 99 62.50 3145 3295 65995 12280 100.0 1.113 !DANGEROUS LOAD-DO NOT USE!
+01.6 100 63.00 3169 3346 67847 12319 100.0 1.100 !DANGEROUS LOAD-DO NOT USE!
+02.4 101 63.50 3193 3396 69752 12358 100.0 1.086 !DANGEROUS LOAD-DO NOT USE!
+03.2 102 64.00 3217 3446 71713 12396 100.0 1.073 !DANGEROUS LOAD-DO NOT USE!
+04.0 102 64.50 3240 3497 73731 12433 100.0 1.060 !DANGEROUS LOAD-DO NOT USE!

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 98 62.00 3187 3383 71162 11987 100.0 1.081 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba 98 62.00 3040 3079 57308 12509 99.8 1.181 ! Near Maximum !

 

[Ridgerunner665]

OCW plan of attack.... In grains of MRP.

59.5
60
60.5
61
61.5
62

 

[SJB358]

OCW plan of attack.... In grains of MRP.

59.5
60
60.5
61
61.5
62

Question for you RR. If your speeds are consistent at 61-62 and your getting that sorta accuracy why drop way down. Just wondering?

Seems like with a load like that a little seating adjustment could have you where you wanna be for group size. If your spreads are acceptable it should shoot relatively consistent out far as well?

 

[NWBlacktail]

Hmmm, can't quite make it to node 4 with MRP. Node 5 puts you down around 58.5 or 59 grains.

 

[Ridgerunner665]

OCW plan of attack.... In grains of MRP.

59.5
60
60.5
61
61.5
62

Question for you RR. If your speeds are consistent at 61-62 and your getting that sorta accuracy why drop way down. Just wondering?

Seems like with a load like that a little seating adjustment could have you where you wanna be for group size. If your spreads are acceptable it should shoot relatively consistent out far as well?

Ha...I've been asking myself that same question...the answer I keep giving myself is that with the OAL at 3.34" the 62 grain load is leaning on the brass pretty hard at 64k+ psi. I'm OK with that from a safety standpoint, but 280 Ackley brass isn't cheap...I'd much rather keep it between 61 and 63k psi if possible so the brass doesn't take such a beating.

Hmmm, can't quite make it to node 4 with MRP. Node 5 puts you down around 58.5 or 59 grains.

Having said what I said above...I won't back down to node 5, not with MRP...thats 52k psi, not enough pressure....but I disagree with you on not reaching node 4, Chris Longs numbers say node 4 is at 1.10ms (+/- 2%)...I think the 62 grain load is on node 4, but more shooting will need to be done to confirm it....it is within that 2%.

http://www.the-long-family.com/OBT_paper.htm



I have options that I'm considering....they are see what 62 grains does when I move the bullet out to about 3.38" OAL (62k psi)...and/or shorten it to 3.33" and drop back to 61.5 grains....or anywhere in between that I can find a sweet spot.

I want to see what the OCW shows...but if I don't like what it shows...I'll go old school on it and make it work the old fashioned way.

 

[NWBlacktail]

....but I disagree with you on not reaching node 4, Chris Longs numbers say node 4 is at 1.10ms (+/- 2%)...I think the 62 grain load is on node 4, but more shooting will need to be done to confirm it....it is within that 2%.

Ok, I follow. You'd be within 2%. Keep us posted, lots of fun :mrgreen:

 

[Ridgerunner665]

Plan B is, if the 150's won't give me what I'm after...dump them and switch to the 168's and aim for node 5 (1.23 ms), that one will be EASY to hit with MRP.

 

[muzz]

if you dump the 150's let me know ill buy the leftovers. I cant find any around here now that mine is shooting them well.

 

[Whitesheep]

What a great thread. I trust no one will mind if a newbe joins.

I have a Patriot in .280 Nos AI and so far am quite happy with it. This is a dual purpose rifle for me. Hunting first and silhouette competition second. For that reason I aimed at keeping the competition setup below 9lbs so I can shoot hunter class. I am right at 8lb 14oz using Talley mounts and a VX3 -6x20x40 AO VH scope. While the VH reticle is not helpful in competition, it is a great hunting reticle.

Since this is a reloading thread here is what is working for me at the 120 round mark. The first 35 were break in loads which I used .280 Rem to fire form. Interestingly the fire formed loads measure a little different from the Nosler brass I have been using for accuracy testing.

My OCW identification process starts with seating depth so I don't really get to OCW until the second range visit. My best loads so far are:

140gr Sierra Game King over 64gr of RL-22 set at 2.705" to ogive at a speed around 3100 fps. (This was at 3800 ft in Payson AZ)

160gr Sierra Game King over 57gr of RL-19 set at 2.705 to ogive. This is a seating depth test load so this is pretty mild, but shows mad promise.

Regrettably my rifle is on its way to Bend to address a stuck safety issue, but I hope to have it back in a few weeks. In the meantime I am going to miss a few silhouette shoots, but my ego could use a break anyway.

Looking forward to hearing about everyone else's loads, especially with ABLR.