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I was checking out Sierra's web site to see if they had anything new... and i noticed they have a 90gr SMK in .224 caliber. I dont know how long they have had it... but that is not what this post is about. I noticed that the BC rating went up... 4 times consecutivly as the velocity went up... just like it "should". Then i looked at the highest velocity and its BC rating... it actually went down from the previous BC rating wich was at a lower velocity. Here is what im talking about: http://www.sierrabullets.com/index.cfm? ... llettype=0
BC Rating for .224" 90gr SMK
.504 @ 2200 fps and above
.511 between 2200 and 1900 fps
.500 between 1900 and 1750 fps
.467 between 1750 and 1575 fps
.400 @ 1575 fps and below
At first i thought it was a typo... then i realized there was not a picture of the bullet on the web site... so i could not tell how the tail was designed. Maybe its one of those 90 Degree tails like the 100gr .224" ammo and it might cause extra drag at higher velocities? I contacted Spade via yahoo messenger and we spoke for a minute or two... then he called Sierra and got the "stuff happens" answer. In other words... they really dont know why.
Any help would be much appreciated.
BC
BC Rating for .224" 90gr SMK
.504 @ 2200 fps and above
.511 between 2200 and 1900 fps
.500 between 1900 and 1750 fps
.467 between 1750 and 1575 fps
.400 @ 1575 fps and below
At first i thought it was a typo... then i realized there was not a picture of the bullet on the web site... so i could not tell how the tail was designed. Maybe its one of those 90 Degree tails like the 100gr .224" ammo and it might cause extra drag at higher velocities? I contacted Spade via yahoo messenger and we spoke for a minute or two... then he called Sierra and got the "stuff happens" answer. In other words... they really dont know why.
Any help would be much appreciated.
BC