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They are S-284's.

Seems the closest we've come to identifying these is the Finnish 7.62x53R

Just found THIS!

"Because the Finnish Army considered the S-1 bullet too inaccurate for rifles and inappropriate for...

Definitely make for a different looking .308 round compared to the usual Sierra/Hornday

A local FFL and close friend called and said he'd bought a cardboard box of misc reloading items at an estate sale.

He offered the whole box to me for a very fair price.

It was a little...

I can't find marks/streaks on any of them.

Of course, they could've been living in that plastic bag for 20+ years, too. Can't say what effect that might have had on them.

I wouldn't know what signs to look for other than those on my Sierra's after I pull one and it shows marks from having been seated.

They all look like the ones in the OP.

Thanks

thanks, message sent

I'd gladly mail a few to any of you experts for examination and re-measurement.

Using two different calipers I just measured a dozen of them, and they're .308 at their widest points.

And using...

Thanks!

I've searched the net high and low and could not confirm 166 grains anywhere.

Not doubting you, just looking to confirm.

Can you provide a link showing Finnish D166 ball ammo at...

Thanks, but I've yet to find Finnish ball in 166gr

yessir....sticks hard to a magnet, and I heated it with a butane torch. Lead center melted.

Thanks

I just had a friend tell me the depth of the cannelure indicates they could have been used in full auto guns since it keeps the bullet from being pushed back.

yessir....lead core, steel jacket

Was a challenge to section one yesterday

166gr

steel jacket

lead core

7.8x28.2mm

I've loaded them in my .308, and they shot accurately at 100yds.