Strange ( to me ) bullet

[Tequila Jim]

I have been given a few bullets that ae strange to me. The base is .380 and the font half .366, something about the
base rides in the groves and the front in the lands. I think??? Is this what is called a duplex bullet? Thanks for any info.
Regards, Jim
duplex refers to the load not the bullet right?

[Mako]

Whenever I've seen "duplex" used, it was referring to the powder, not the bullet.

That is unless you are talking about an M198 7.62X51 Duplex round, which he's obviously not.  Those actually had two bullets in them.

~Mako

[Wolfgang]

Sounds like a "bore rider" bullet.  I think that is the name I recall. Only ones I've heered of were rifle bullets for long range precision shooting that hand some of the bullet bigger dia. to engage the rifleing and most of it the dia. of the lands to ride the lands. Someone a couple of years ago mentioned them on the "Billy Dixon Long Range Shooting Society" forum.  I don't recall hearing any follow ups on how they performed.  Is it a rifle bullet ?   

[Tequila Jim]

Yes Wolfgand, 38/55 to be exact, only got 5 to try out. Kind of looks like a bottle neck
bullet.  Regards, Jim