公開這個很危險
PM談


不了...


彈藥這東西有點複雜
M193的規格定義在Mil-C-9963F規格書內
55 grain bullet (q 2 grains) at a muzzle velocity of 3,165 (q 40 fps) from a 20" barrel @ 78 feet from the muzzle. Accuracy: maximum of a two inch mean radius at 200 yards from ten 10 shot groups (~3 MOA). "Statistically average" M193 ranges from 1.2 to 1.6 inches mean radius, which is equivalent to 1.8 to 2.4 MOA. Velocity runs about 3,200 fps due to gas loss through the port. Accuracy is typically around 2 to 2+ MOA from an M16A1 rifle at ranges of 100 to 300 yards. M193 ammunition should have 1:12 twist or faster. M193 is barely stabilized with 1:14 at ambient temperatures and will not stabilize at all when the air temperature drops below freezing.
M855(SS109)的規格訂在 MIL-C-63989規格書內
NATO specifications for M855 Ball require a 61.7 grain (q 1.5 grains) with a hardened steel penetrator at a velocity of 3,000 fps (q 40 fps) from a 20" barrel @ 78 feet from the muzzle. Typical velocity 15 feet from the M16A2's muzzle is 3,100 fps. Accuracy: maximum of approximately four MOA over the 100 to 600 yard range. Typical accuracy of average lots in an M16A2 is about 2+ MOA. This round must also penetrate a nominal 10 gauge SAE 1010 or 1020 steel test plate at a range of at least 570 meters (623 yards). The M193 round will penetrate this same plate reliably at 400 yards and about half the time at 500 yards. The 5.56mm and 7.62mm NATO rounds will penetrate it reliably out to 700 yards or more. Because the steel penetrator increases the length and changes the weight distribution of the SS-109 bullet, it is suitable for use only in barrels with a twist of one turn in nine inches or faster. 1:10 twist will barely stabilize this round and not below zero degrees F.

大致上M193彈頭較輕 (55gr)
M855彈頭較長且較重(62gr)
因為重量長度不太一樣，所以需要的槍管纏距也不同
飛的速度不同
穿透力發生的距離也不同...


廢話說了一堆
我買這彈藥是因為在網上看review 大部分的人說這子彈還不錯
不至於推力不夠
燒得也算乾淨
而且銅彈殼
對退殼勾比較溫柔...
我的槍管纏距是1:7
打62gr以上的沒問題
加上最近有一批M855的彈藥還算便宜(好像某台詞)
為了ACOG
可能弄一些來試試看,跟M193比較一下.



湯姆大跟鄉民的恩怨
該怎麼解決就怎麼解決吧~