In ancient times you would just apply for a .223 or 5.56 and it wasn't a problem as most dealers would know they were essentially the same (ignoring the pressure/throat differences for the point of the original question)
In modern times you need to be more specific, if you want you to buy .223 marked and 5.56 marked ammunition apply for .223/5.56, the same with 7.62x51/.308" win. I have seen some dealers stating that for Mosin Nagant rifles your ticket must be 7.62x54 not generic 7.62.
As to buying .303" savage when your rifle is .303" British or .22" WMR when your rifle is .22"LR that would be very unwise, you could be charged with illegal possession as you have no lawful reason to posses it. Do you really want to be defending yourself in a court on the basis that your ticket is a generic calibre but you have purchased a rifle in a specific chambering.
If you want to collect ammunition then apply for a collectors condition, mine is 2.7mm-19.2mm, it is conditioned that I don't shoot any of it though.
In modern times you need to be more specific, if you want you to buy .223 marked and 5.56 marked ammunition apply for .223/5.56, the same with 7.62x51/.308" win. I have seen some dealers stating that for Mosin Nagant rifles your ticket must be 7.62x54 not generic 7.62.
As to buying .303" savage when your rifle is .303" British or .22" WMR when your rifle is .22"LR that would be very unwise, you could be charged with illegal possession as you have no lawful reason to posses it. Do you really want to be defending yourself in a court on the basis that your ticket is a generic calibre but you have purchased a rifle in a specific chambering.
If you want to collect ammunition then apply for a collectors condition, mine is 2.7mm-19.2mm, it is conditioned that I don't shoot any of it though.
