Squidders,
Hand loading is the practice of "rolling your own" ammo.
Basically you take used (or new) brass (aka the cartridge case)
You pop out the used primer (if re-loading). This is done with a press and die (think something that looks like a manual beer pump with a carefully machined tube inside that accepts that size of case)
So - you De-cap (remove primer), re-size the case and flare open the mouth. Put a new primer in, add a carefully weighed or measured amount of the right powder (there are tables to help with this), put a head in the top of the case, crimp closed, Roberts your mums bruvver.
The advantage of reloading is that you can "tune" the round to your rifle. Got a short barrel? Use a faster burning powder to get the right velocity. Got a long heavy barrel? Use slower powder to even the pressure curve. You can play with powder types, weights, head weight and shape, primer type etc. to get the best possible round for your rifle.
Red
Oh - and I'd rather have a Steyr Scout BTW...oh hang on ...I have