Quoted: Hadta hit walmarts yesterday for some school supplies for my oldest daughter...and since daddy just picked up a new BM A2 M4gery I hit the sporting goods dept. to check out what sorta .223 fodder they had and came across...
"Winchester White Box 40 Rd Value Packs...45grainers Boasting 3,400FPS"
I took a pass but probably shoulda sprung for a box to try out....way I figure (since I usta roll my own years ago)...for win. to use the 45gr bullet and brag on the box in big bold print "3,400fps!!!"...they must of used a faster burning powder..which to me means this might improve "cycling" in a carbine....then again?...Ftlbs of energy will certainly take a hit but penetration should be right up there.
Whaddaya'll think?....
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The velocity is probably measured out of a 24" barrel so it will be lower in shorter barreled rifles. No, penetration takes a huge hit, not so much because of velocity but because of bullet construction. it is a lightweight varmint bullet, it does not have enough penetration to reliably reach the vitals on a human aggressor because it it breaks up too quickly(fragmentation is optimal but it must reliably reach 12" which the varmint bullets dont because fragmentation begins too soon and is too dramatic. If you are looking for a defensive round avoid lightweight varmint rounds such as the 40-60 grianers.
XM-193 is a good choice but your best bet woud be the heavier otms(68-77 grain rounds) these have an open tip but are not hollow-point bullets, they are basically full metal jackets but their terminal performance(fragmentation)is much better than the lighter rounds including XM-193. if your rifle will accurately shoot the 75-77 grain bullets you should use them, but if not the 68-69 grain OTMs work fine.
www.ammo-oracle.com this is a good read on the 5.56 cartridge