6.5x284 Norma (10/09/2009)
Just where did the 6.5x284 come from and why is it significant? The 6.5x284 has been a long
time wildcat cartridge. Its widely known that the 6.5mm bullets have exceptional ballistic
coefficients and sectional densities, especially for their grain weights. The 142gr Sierra
match king is one of the notables here, with a ballistic coefficient that is higher then the
200gr .30 cal Match King, and approaching the BC of the 220gr .30 Match King. If you look at
some of the other bullet manufacturers like Lapua (139gr Scenar) and Berger (140 VLD) these
BC's even get higher, well into the 6's. So, with the
popularity of the 6.5x284 wildcat growing over the past 20 years, Norma decided to standardize
the caliber and it is now CIP registered. The cartridge is derived from the .284 Winchester
necked down to the 6.5mm (.264 cal) bullet. This also leads to a wide case cartridge that has become
so popular with accuracy folks for universal and consistent burn rates. It is also short enough to
be chambered in some short actions. The recoil is about even with a heavy .308, depending on the load,
but nothing like the .300 WM or 7mm Rem. and it has ballistics that are better than the A191
.300 Win Mag Match 190gr load. So, it is somewhat obvious as where the popularity
comes from.
The down side is that it is a rebated rim cartridge, which "can" provide some feed and function
problems, but most good quality bolt actions don't have a problem. The other problem is the
limited availability of brass (that doesn't need to be re necked from something else)
and loaded ammo. We thought this was changing when the 6.5x284 was on its popularity high,
but there is still just a very few ammo makers loading factory ammo for it. Rifles, of course,
are also limited and generally only available from custom rifle builders. What does this caliber
offer over the other 6.5's that have recently become so popular?
Well, it is probably the hottest of the bunch. It can get velocities a decent amount
faster, but the downside is that when loaded hot, the barrel life is effected with some rifles and
ammo combos getting less than 2000 rounds of life from a chamber. But if you are looking for a long
range cartridge with moderate recoil in a small package, this cartridge is a fine choice.
Recommendation: The 6.5x284 will work great for military and law enforcement applications,
though there is limited variety of factory loads and rifles. If this resolves itself, it can
be an exceptional load. Penetration is also a significant concern, as the sectional density
of the 6.5 bullets can be very high, and penetrate deep, so watch over penetration if your
agency selects this cartridge, though it provides good armor & barrier penetration.
Military Applications
Note: The Black Hills 142gr was chosen as my preferred
load for military applications. This load sends the 142gr match king at 2950fps and out performs
the .300WM 190gr Match loads at long ranges.
Black Hills 6.5x284 Norma Match 142gr Sierra Match King at 2950fps
Bullet Drop (Inches)
|
100y
92m |
200y
183m |
300y
275m |
400y
366m |
500y
458m |
600y
549m |
700y
641m |
800y
732m |
900y
824m |
1000y
915m |
|
+12.0 |
+21.0 |
+25.0 |
+23.3 |
+15.3 |
Zero |
-23.6 |
-56.6 |
-100.6 |
-157.3 |
Energy (Muzzle - 2744Ft.-Lbs)
|
2454 |
2185 |
1941 |
1718 |
1514 |
1329 |
1156 |
1002 |
865 |
747 |
Wind Drift (Inches) 10mph Crosswind
|
0.5 |
2.1 |
4.9 |
8.9 |
14.3 |
21.3 |
30.1 |
40.8 |
53.6 |
68.8 |
Law Enforcement Applications
Note: I have chosen the HSM 142gr load here for LE applications because it is loaded
110 fps slower than the Black Hills. The lower power load will help with over penetration issues
and provides a little less recoil and report to aide in followup shots. The accuracy with the HSM
load has been excellent.
Please insure proper tests are
executed to investigate the penetration of this round.
HSM 6.5x284 Norma Match 142gr Sierra Match King at 2840fps
Bullet Drop (Inches)
|
|
50y
45m |
100y
92m |
200y
183m |
300y
275m |
|
HSM |
-0.2 |
Zero |
-3.3 |
-12.0 |
Energy (Muzzle : 2561 ft-lbs)
Wind Drift (Inches) 10mph Crosswind
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