284 shooters

.284

Butch:

There is some great information on the .284 onthe 6mmBR website.

I beleive you will find a consensus that H8831SC is the best over all powder for the 180 Berger bullets.

Most if no all got some extra velocity from the Re-17 but their accuracy left them.

Nat
 
Butch,
I've got three 284 bbls., and have shot RL17 in all three with both Berger & JLK 180s, as well as S175MKs. I can get 2900fps out of both of the 30" bbls. with RL17, with accuracy good enough for LR prone HP matches. However, H4831 (not the SC version) produces 2800+fps, with slightly better accuracy. I tried 4831SC, but accuracy & velocity were both better with plain 'ol 4831.
 
Does this help?

Cartridge : .284 Win.
Bullet : .284, 180, Berger M T VLD #28502
Cartridge O.A.L. L6: 2.800 inch or 71.12 mm
Barrel Length : 24.0 inch or 609.6 mm
Powder : Alliant Reloder-17

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 73 37.20 2220 1970 33820 7835 98.4 1.624
-18.0 75 38.13 2269 2057 35965 8008 99.0 1.583
-16.0 77 39.06 2317 2146 38239 8168 99.4 1.541
-14.0 79 39.99 2366 2237 40651 8315 99.7 1.497
-12.0 81 40.92 2413 2328 43208 8446 99.9 1.456
-10.0 82 41.85 2460 2420 45920 8563 100.0 1.416
-08.0 84 42.78 2507 2512 48802 8666 100.0 1.378
-06.0 86 43.71 2553 2606 51859 8766 100.0 1.341
-04.0 88 44.64 2599 2700 55107 8865 100.0 1.305 ! Near Maximum !
-02.0 90 45.57 2644 2795 58561 8961 100.0 1.271 ! Near Maximum !
+00.0 92 46.50 2689 2890 62235 9054 100.0 1.238 ! Near Maximum !
+02.0 93 47.43 2733 2986 66148 9145 100.0 1.206 !DANGEROUS LOAD-DO NOT USE!
+04.0 95 48.36 2778 3084 70314 9234 100.0 1.176 !DANGEROUS LOAD-DO NOT USE!
+06.0 97 49.29 2822 3182 74757 9320 100.0 1.146 !DANGEROUS LOAD-DO NOT USE!
+08.0 99 50.22 2865 3281 79499 9404 100.0 1.117 !DANGEROUS LOAD-DO NOT USE!
 
If that is true a lot of guys are shooting very hot loads. I wonder what the pressure is in a 29-30" barrel at 2950fps.
Butch
 
What is the source of this data? Every .284 shooter that I know shoots waaaaaaaaaay more powder than the max load shown.
 
he is also showing a 24 vs a 30 in bbl and using 2.8 for coal......
mike in co
 
That data is using the old max. COAL for the 284. The 284 was originally designed to be used in Win. M88 & M100 rifles, with short magazines, which required bullets to be seated deeply into the case. My barrels are throated to allow 180VLDs to be seated out to the point where the bullet's bearing surface/boattail junction is above the case's neck/shoulder junction. That's gonna make a whole lot of difference in max. load. I'm running over 54grs. of H4831, and 53grs. of RL17 with 180s.
 
Butch,

According to Quickloads, running 55.4grs of 4831sc under a 180VLD seated for an OAL of 3.200, the pressure is 61,451psi, and velocity is 2854fps...This is what alot of guys running the straight 284 are doing. I'm running my 284 with 54.8 grs, velocity of 2820fps over the crony...I've heard alot of guys talking about running as much as 56grs in a straight 284...oh....pressure would be in the 68,000psi range....

RL17 data on quickloads...bear in mind this is using 70F as the temp....52.5 grs, 180vld seat to an OAL of 3.20, velocity of 2951fps, pressure of 71,492psi...

Figures are for a 30" barrel...

Hope all is well...

Jim
 
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