Originally Posted by
Nomercy448
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:
The Interbonds were (they are suspended now) a bonded core verses the interlocking ring design of the SST's I know. The interlocks and the SST's are virtually identical except for the nose design giving the SST the BC advantage. I'm just hoping the 200gr .338 SST's hold together better than the 139gr .284's did at closer ranges. I hate chasing down blown shoulder hogs! They tend to be a bit ornery that way
