223 Bullets

5" ?!:eek:

At 100 yards?!

That's.... geez... you could do that with a slingshot.

I suspect those bullets aren't very concentric, the rather large variance in length is one clue... besides being "seconds".... and 1:8 is a rather fast twist for 55gr bullets, even extra long ones.

I'm pretty sure you're spinning them too fast. They might work just fine in a 1:12 or 14 barrel but not so much at 8.
 
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