Ten rounds.
Why did I stuff ten rounds into a empty case? Some people measure case capacity in Milliliters, I prefer to measure it in Longrifles. For comparison a .338 Laupa has a capacity of 3 LRs.
I admit it is not the most accurate method of gauging case capacity 
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Nice hollowpoints for .22LR. What are they?
Dom, they are CCI subsonic HP.
You’re a lucky man Steve, CCI subsonics are my favorite but nobody around here reliably has them, hp or ball.
How many can fit in a .50 BMG?????
Lance, I did not have an empty .50 bmg case on hand
Here’s a follow-up thread from the father of the shooter
http://www.calguns.net/calgunforum/showthread.php?t=258508
About 40 years ago some friends of mine and I contemplated necking a .50BMG to take phonagraph needle…After many more beers, and a discussion about how many reduction dies, and cost, it was going to take, we decided to try the .22 route, but a few more beers later we decided that we could not get a receiver strong enough to withstand the pressure of a full .50BMG case of powder pushing a .22…So we had a few more beers!
Spiff
Spiff, LOL