Originally Posted by
d80hunter
I too am not fond of SST in 7mm-08 because of their expansion. They have a high B.C. but I believe the Interbonds have the same high B.C. They might be awesome in other calibers for all I know.
Originally Posted by
super_hunt54
Hornady lists the same BC as well as the same sectional density. That's something I could never figure out since the interlock/interbond hold together much better than the SST's at close range high speed. As far as my .338fed goes, the BC is quite a bit higher for the 200gr SST than it is for the Interlock. The SST is 0.450 and the Inter is 0.389. Pretty significant difference when I start getting out past 300 yards.
Elementary, my dear Watson!
Since their names are so similar, that confusion happens a lot, but the InterLock and InterBond are very different bullets. The InterBOND and SST are the same bullet profile, the InterLOCK and SST (and InterBOND) are not.
Just to clarify quickly: Sectional Density is only dependent upon bullet weight and caliber. All 139grn 7mm bullets have the same SD, all 200grn 0.338" bullets have the same SD. It's nothing more than bullet weight (in pounds) divided by bore diameter squared (in inches). So it's a given that they'd have the same SD.
Regarding the BC differences:
The InterBond and InterLock are not the same bullet design. The InterBond is a polymer tipped bonded cup and core boat tail design. The Interlock is a lead tipped soft point cup and core flat base with an interlocking ring and interlocking cannelure.
The 200grn 338 bullets you reference are an SST and an InterLOCK, whereas the 139grn 284 bullets you and D80 mention are SST's and InterBOND's.
InterLock:
InterBond:
SST:
