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Posted: 10/7/2009 11:51:08 AM EDT
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From what I understand this round was designed around the 20" barrel with a 1 in 14" twist. With the twist being so slow it barely stabilized the bullet and that aided in it's fragmenting lethality. WIth a shorter 16" barrel and a 1 in 9" twist, are these characteristics still there, or not quite the same?
And on a side note I shot up a bunch of IMI M193 I had just bought for $5/box because I didn't want to use my IMI and Lake City M855. Now I finally read the best defensive ammo thread and I guess I saved the wrong ammo! 
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Quoted:
From what I understand this round was designed around the 20" barrel with a 1 in 14" twist. With the twist being so slow it barely stabilized the bullet and that aided in it's fragmenting lethality. WIth a shorter 16" barrel and a 1 in 9" twist, are these characteristics still there, or not quite the same? And on a side note I shot up a bunch of IMI M193 I had just bought for $5/box because I didn't want to use my IMI and Lake City M855. Now I finally read the best defensive ammo thread and I guess I saved the wrong ammo! Where di you buy that ammo? As for you question, i dont want to give out false info. |
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the fragmentation isn't due to the twist rate. It is an issue of physics once the bullet encounters resistance. At that point the back of the bullet wants to come around take the lead. If you have ever hit the brakes hard when towing a trailer without trailer brakes you can more easily understand this. With enough speed the pressure on the bullet as it gets sideways, cause the bullet to break at the cannelure (the weakest point). It then breaks into multiple pieces that each kinda do their own thing. in a 16 inch barrel you can expect this to happen out to 100 yards or a bit more.
At slower speeds the bullet will still want to turn around, it just won't have the pressure on it at it's sideways point to break it. |
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