We've never shot them at distances greater than 100 yards. IIRC, the 1/2 inch gongs were not much more expensive than the 3/8, so we went that way.
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I'd go with 3/8"....specifically from CMP.
You can hear bang............dings from 1038yds away using my MWS 16" .308. I doubt I could have heard 1/2"
http://www.youtube.com/watch?feature...&v=dQtP8B03XuM
F2S have you shot 5.45 at steel? I heard the steel slug can be pretty bouncy and I was wondering what ranges would be safe to shoot at and not damage the plate.
I believe they said it was 1". I know it was $400 per target. I did not go and eyeball the myself to be sure, though. Maybe it was 1/2". Either way, each target took around 12,000 rounds of M193 this last weekend at 30-50 yards, and they looked fine to me when I went near 'em. Like I said, I didn't get all up on them, but I didn't see any damage from the 7-yard line.