I use 9mm steel, it isn't something everyone uses

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.4" marbles are great ammo. Just a little lighter than 3/8 steel and a bit larger for good grasp on the pouch. They rip and they're very visible. A bit hard to find but if you search up 11mm marbles for topping off beer it will get you close. I think I bought a 1000 earlier this year for about $20 but can't find out where. Found it
Lot of 1000 quantity, 0.4" solid glass marbles. Perfect for sling shot ammo. ebay

 

Thanks For posting that - I just ordered those .4 inch marbles on eBay - anxious to try them ! Do you find it’s hard to see them in flight because they’re clear ?

 

They stand out like a laser most of the time. I shoot them with the same bands I use for 5/16 and get a really zippy shot and no resulting handslap. 3/8 strength bands might slap you a bit.
I think you gonna like em.

 

Great - thx !! Report to follow

 

I got the .40 cal glass marbles & so far liking them. they're noticeably bigger than 3/8", but like you said, shoot about like 5/16" steel. Nice change of pace - shoot nice and flat. Only downside is can't pick up the ones that jump out of my catchbox with a magnet ... thx for telling us about these

 

I sort of covet the ones I have left.
I shoot steel cans a lot and have a fair number of rebounds out of the catch box as well. The nice thing is that when the Sun comes from a different angle they're easy to spot. Someone here or on the other site recommended them to me quite a while back and they became my favorite plinker round until the bag started getting low. There's an ammo order in my future.