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Posted: 2/23/2007 11:11:55 AM EST
I realize one is 75Gn, and the other is 77 Gn., but how much do they differ in the ballistics category...especially "Terminal Ballistics". I know the 75Gn match load has sealed primers and the MK262 is sealed neck AND primers. Anywhere i can go see test data of both?


Sorry if this has been asked before, but with all the fuss of getting MK262 that are not "Seconds" I opted to load all my "Go magazines" with the Black hills 75 Gn. Match rounds.

Do you think there is that much difference on the "Receiving End"?

Tack
Link Posted: 2/23/2007 12:30:54 PM EST
Isn't the MK262 a 5.56mm load and the 75-gr a .223 match load? Don't know how they do it (different powders I guess), but the MK262 is supposed to fire a slightly larger (77-gr vs 75-gr) projectile at a faster speed, so I guess it will have more energy when it hits something.
Link Posted: 2/27/2007 4:40:19 AM EST
The last 3 boxex I received are marked .223, but they have the WCC Nato headstamed brass, which would lead me to believe they might really be 5.56.

anyone know?

Tack
Link Posted: 2/27/2007 6:05:32 AM EST
[Last Edit: 2/27/2007 6:18:15 AM EST by Molon]

Originally Posted By Tack:
The last 3 boxex I received are marked .223, but they have the WCC Nato headstamed brass, which would lead me to believe they might really be 5.56.

anyone know?

Tack



repost


Speaking of variations in Black Hills’ ammunition, here is an interesting find for those of you who haven’t already come across this. Apparently, Black Hills ran short on their “223 Match” brass that is normally used to load their 75 grain Match HP “red box” ammunition. Supposedly, in order to meet their deadline, they substituted the WCC 06 brass that is used to load their MK262 ammunition.

The WCC brass has sealed and crimped primers. So, the 75 grain Match HP ammunition that was loaded using this brass has the “T1C” 75 grain Hornady BTHP bullet with a cannelure and crimped case neck and now sealed and crimped primers.









Link Posted: 2/27/2007 12:19:49 PM EST
[Last Edit: 2/27/2007 12:22:37 PM EST by DevL]
Black Hills 75 grain uses the Hornady bullet which has an earlier yaw cycle and fragmentation than the 77 grain Sierra bullet used in the Black Hills line. The 75 sold by BH is .223 pressure.

To get realtive comparisons you should look at the 5.56 loads (77 grain MK 262 and 5.56 TAP)

For the .223 loads look at 77 grain BH and 75 grain BH or 75 grain TAP FPD.

The 75 grain bullet will be very slightly less accurate in most, but not all, rifles.

The 77 grain bullet will have the inferior terminal ballisitcs due to fragmenting too deep in ALL rifles.

The .223 loads will be slightly more accurate than the 5.56 loads but will have reduced range of fragmentation, increased drift and drop, etc.

There is a nice 18 page thread on MK262, 5.56 TAP and 75 grain .223 loads you should read. The .223 75 grain TAP/FPD and Black Hills 75 grain Red box are essentially interchangable in the thread for comparison purposes.
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