I'm not trying to make light of this story. I'm glad that this plot was found out before it happened. My biggest concern is the lack of the media to report the correct facts. I've never heard of a 45mm or a 22mm.
From the Philadelphia news leader: Alleged plot foiled at Pottstown H.S. - 12/09/08 - Philadelphia News - 6abc.com
NORRISTOWN, Pa. - December 9, 2008 (WPVI) -- A Montgomery County high school student is being charged with attempted murder.
The teen has been identified as 15-year-old Richard Yanis of Feist Avenue in Pottstown. Authorities claim Yanis was planning a shooting spree at Pottstown High School.
Investigators say the 15-year-old had three guns - a 45mm, a 22mm, and a 357 magnum with 300 rounds of ammunition.
snip...
Typical shoddy workmanship of the media. It makes you wonder how much other information they report is accurate.
I married my wife for her looks; just not the ones she gives me when I bring home a new gun.
Any society that would give up a little liberty to gain a little security will deserve neither and lose both.
Benjamin Franklin
They're probably talking about Russian or Chinese ammunition. Take a look at the following:
5.56mm (5.56 x 45 mm) Ammunition
Hussar 35005 45mm Rusian Ammo Brass with Decals - eBay (item 200243715784 end time Dec-30-08 10:02:19 PST)
The 22 mm ammo is probably actually a 5.56 variant:
Nammo AS - 5.56mm (.22 Cal)
If you watch the video on the link given you will see that they are talking about a .45 a .22 and a .357 M.
looking at the guns in the video I'm pretty sure were not talking about anything exotic here.
This kid had a nice looking .45 (acp?) a decent looking 22 revolver and the .357 simple as that.