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Posted: 10/17/2004 4:15:30 PM EST
Is there any way to make a load for a 1/9 barrel that will increase the lethality over a standard xm193 round, approaching or approximating the effects of the rounds the special operations guys are using?
Link Posted: 10/17/2004 4:16:56 PM EST
Link Posted: 10/17/2004 5:43:21 PM EST
I like the Sierra 69grn BTHP.
Link Posted: 10/17/2004 5:50:01 PM EST
Now, I'm from Utah and don't know crap. So, tell me if I am wrong. But the terminal performance of these rounds is due to the fact that the bullet turns sideways before coming apart at the cannelure.

The Sierra doesn't have the cannelure, so does the increased bullet weight make the difference?
Link Posted: 10/17/2004 6:05:13 PM EST
Link Posted: 10/17/2004 6:11:19 PM EST
If you're looking for something more lethal than M193, it doesn't exist.
Link Posted: 10/17/2004 10:42:05 PM EST
Its the long length and thin jackets not the cannelure.
Link Posted: 10/17/2004 10:54:21 PM EST
68gr Hornaday

69gr Sierra MatchKing

75gr Hornaday

Some 1:9 rifles work with the 77gr SMK (the bullet used in Mk262 ammo), some don't - 1:9 is just 'on the edge' between too slow & fast enough of a twist for that perticular round....

Faster twists are better though, and the only affect twist has on ballistics is that it limits how heavy of a round you can fire, of course...

Link Posted: 10/26/2004 5:42:28 PM EST
I have heard the 1 in 7 twist is slightly less accurate with 55 grain pills. Is this true? Is there any reason at all not to have a 1 in 7? (I could care less about varmit rounds of 40 grains or less)
Link Posted: 10/26/2004 6:05:50 PM EST

Originally Posted By akconvert:
I have heard the 1 in 7 twist is slightly less accurate with 55 grain pills. Is this true?



No


Is there any reason at all not to have a 1 in 7? (I could care less about varmit rounds of 40 grains or less)

No
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