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Posted: 11/28/2015 7:18:09 PM EDT
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Been reading the sticky pages all day along with other posts, and have a question. For 223/5.56 self defense ammo, the Ammo FAQ page lists several great choices for each barrel type. I'm just wondering why it's mostly suggesting OTM instead of JHP? I thought that OTM was designed for accuracy and not expansion?
Sorry if I'm re-hashing a dead horse. |
| OTM bullets are uniform thin jackets, that tend to consistently fragment when driven at appropriate velocities. The only JHP that is recommended is the Barnes TSX, which is all copper, and actually expands like a hp. They penetrate due to monometal construction which creates larger bearing surface driving the bullet even though it expands. JSP's have more traditional expansion, sometimes with the skieved bullet design. |
| Based on my research, I believe you're right that OTM is more for accuracy. The weight is more in the base of the bullet and when it hits soft tissue it almost guarantees that the bullet will yaw. Mk262, for example, the MOD 1 has a cannelure that will allow the bullet to fragment at that point when it does come around (velocity dependent). The weight in the base is said to also improve the flight ballistics of the round. OTM is not classified as a hollow point so it doesn't violate The Hague convention (according to our military legal guys). |
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Sounds like we've been reading the same stuff. After doing a lot of reading I guess I'll just plan to stock up on some SP ammo for my home defense/bug-out stock pile. So much info on the web, and in here it makes it harder to choose sometimes.
I did find a couple great deals going on (Federal Fusion MSR1 62 gr, and also Federal 55 gr SP Power shok) trying to decide which to stock up on while it's so cheap for Black Friday. Any opinions? I have found good reviews on the Fusion MSR... but I haven't found anything at all on the plain Jane Federal 223A SP. my rifle is a 1:7 16" so I wouldn't be scared to buy the 55gr |
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"Jacketed hollow point" bullets are pistol things, not rifle things. Given the size of the .224" projectile, it's not likely you'd be able to get a functional "hollow point" bullet to feed, and any bullet that would feed would have such a small "hollow point" that it wouldn't have any affect on expansion.
Open tip match bullets are made by inserting the core in the jacket from the front, which leaves a very consistent bullet base and an inconsequential opening at the tip. Experimentation has shown that the open tip does NOT cause these bullets to behave like hollow point pistol bullets. They are functionally essentially the same as FMJ bullets, but the consistent bullet base and extra care taken in building the bullets make them capable of much better accuracy. |
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Quoted:
"Jacketed hollow point" bullets are pistol things, not rifle things. Given the size of the .224" projectile, it's not likely you'd be able to get a functional "hollow point" bullet to feed, and any bullet that would feed would have such a small "hollow point" that it wouldn't have any affect on expansion. Open tip match bullets are made by inserting the core in the jacket from the front, which leaves a very consistent bullet base and an inconsequential opening at the tip. Experimentation has shown that the open tip does NOT cause these bullets to behave like hollow point pistol bullets. They are functionally essentially the same as FMJ bullets, but the consistent bullet base and extra care taken in building the bullets make them capable of much better accuracy. MK318 SOST expands so violently that it blows up. X135 expands very nicely! |
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Quoted:
MK318 SOST expands so violently that it blows up. X135 expands very nicely! Quoted:
Quoted:
"Jacketed hollow point" bullets are pistol things, not rifle things. Given the size of the .224" projectile, it's not likely you'd be able to get a functional "hollow point" bullet to feed, and any bullet that would feed would have such a small "hollow point" that it wouldn't have any affect on expansion. Open tip match bullets are made by inserting the core in the jacket from the front, which leaves a very consistent bullet base and an inconsequential opening at the tip. Experimentation has shown that the open tip does NOT cause these bullets to behave like hollow point pistol bullets. They are functionally essentially the same as FMJ bullets, but the consistent bullet base and extra care taken in building the bullets make them capable of much better accuracy. MK318 SOST expands so violently that it blows up. X135 expands very nicely! Because of the jacket construction, NOT because of the trivial opening at the meplat. |
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