284 winchester 150 ABLR

[Gunny81]

I started this project with the hopes of hitting 3100 fps with the 150 ABLR. I chose IMR 4350 because it's on the faster side of H4350 and R17. It's an awesome powder for the 284 platform because it handles all bullets from 120-180gr. I started off with 53.5 gr and went up to 56 gr. with a case overall length of 2.956" which is accurate mag length.

53.5 = 3050
54.0 = 3100
55.0 = 3200
55.5 = 3225
56.0 = 3257 Hot! Stiff bolt handle and not much velocity gain to justify pressure.

I was tickled as a pig in shit when I first read the chrono. My suspicion got the better of me so I checked the chrono in between 5 shot firings against my GAP 308. The velocities I've proven stayed true with the .308. I'm considering trading a friend for his stock savage dbm setup so I can get 3.00" instead of being limited to 2.956".

I was wondering why no one has bothered with IMR 4350 in their 284. I believe it's a very good powder for most combinations. I'm running a blueprinted savage short action with accurate mag bottom metal and dbm, krieger 9 twist @ 28" with brake, manners t3 stock, nightforce 20 moa base, warne rings, and bushnell 6500 6-24x50 ffp g2dmr.

If the bc holds up on these bullets I believe I'll have stumbled onto something very special, and apparently something that hasn't been toyed with much. What's y'alls thoughts?

Here's a couple pics of the chrono reading after 55gr and the rifle. The 54gr charge was the most accurate at 1/4" at 100 and the worst was a tie between the 55.5 and 56 at 3/4". It's still a new barrel so I hope the accuracy will stay with the 54.5 ish loads. If I can stay at 3150 or 3100 ish I'll be happy.



Code:
Cartridge : .284 Win.
Bullet : .284, 150, Nosler Accubond LR 58734 G7
Useable Case Capaci: 57.239 grain H2O = 3.716 cm³
Cartridge O.A.L. L6: 2.956 inch = 75.08 mm
Barrel Length : 28.0 inch = 711.2 mm
Powder : IMR 4350

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 42.80 2481 2050 34054 6917 93.4 1.644
-18.0 84 43.87 2538 2145 36320 7106 94.3 1.602
-16.0 86 44.94 2594 2242 38718 7288 95.3 1.558
-14.0 88 46.01 2651 2341 41245 7460 96.1 1.513
-12.0 90 47.08 2708 2442 43927 7624 96.8 1.470
-10.0 92 48.15 2764 2544 46780 7778 97.5 1.429
-08.0 94 49.22 2820 2648 49818 7921 98.1 1.389
-06.0 96 50.29 2875 2753 53052 8054 98.6 1.351
-04.0 98 51.36 2931 2860 56498 8175 99.1 1.314 ! Near Maximum !
-02.0 100 52.43 2985 2969 60172 8284 99.4 1.278 ! Near Maximum !
+00.0 102 53.50 3040 3078 64091 8380 99.7 1.244 !DANGEROUS LOAD-DO NOT USE!
+02.0 104 54.57 3094 3189 68277 8464 99.9 1.211 !DANGEROUS LOAD-DO NOT USE!
+04.0 106 55.64 3148 3301 72751 8534 100.0 1.179 !DANGEROUS LOAD-DO NOT USE!
+06.0 108 56.71 3201 3413 77538 8590 100.0 1.148 !DANGEROUS LOAD-DO NOT USE!
+08.0 110 57.78 3254 3527 82666 8639 100.0 1.119 !DANGEROUS LOAD-DO NOT USE!
+10.0 112 58.85 3307 3642 88167 8686 100.0 1.090 !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 53.50 3146 3296 75259 8063 100.0 1.167 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 102 53.50 2887 2777 53120 8382 96.0 1.346

 

[CacheCropp]

Looks like Nosler is really going after the long range hunting market. I just read about their 26 Nosler cartridge which is a 6.5mm barrel burner. Now I find out they have a whole line of Accubond LR bullets with advertised high BC's. Just looking at their lineup on their site, I notice their 270 bullet with BC of 0.625! That should make some 270 Win owners very happy.

Nosler is probably charging a mint for these pills though.

Gunny, looks like you've got a great combo, especially for long range hunting, a high BC bonded boat tail should be perfect. Time will tell on the advertised BC numbers. Very intriguing though.

 

[dkhunt14]

I heard the BC numbers on the bullets are way overinflated. I read that someplace.

 

[Gunny81]

I heard the BC numbers on the bullets are way overinflated. I read that someplace.

It's mostly from haters. Lol. Litz won't even answer an email about them. I'm starting to think his ties to berger and people's brand allegiance is what's driving that hype. They're usually the naysayers that say reliable top speeds with this bullet were impossible. I guess everyone's an expert now cause they're on a forum. ;D

I'm taking it to 1000 this weekend at 3100. If It doesn't do it in 6.7 mils from a 100 yard zero, then we'll know.

 

[dkhunt14]

No I believe I read it on longrangehunting by a guy that tested them. It had nothing to do with Berger. He tested a bunch of different ones and they were off by different amounts. There is another thread on there with problems of the bullets and it has 51 pages of responses.

 

[wboggs]

Gunny81 How far off the rifling are you seating these ABLR bullets? I have a few .308 190 grs. to test and need to have a general idea how they shoot most accurately.
Let us know what you learn at the match.
I have measured the 190's and, compared with the Berger 210 VLD, they have a longer, more angled boattail, a shorter bearing surface, and close to the same overall length.
I have been unable to find members who have loading experience with them who are willing to share their data.
Thanks
Bill