Converting Table in Excel to List in excel

Howdy. I am am ammo collector an use a spreadsheet to keep track of my collection. One part of this is headstamps (the marks on the base of a cartridge) and what they mean. I have a "base" sheet that has all my info and from there it breaks up into sub catagories.
I have included the relelvant sheets so my explaination makes sense.

My info is put in with the calibre in the A column and labels in row 1.
So I have a table of headstamps that I want a list out of. I do not a have a set number of headstamps for each calibre and I am continually adding to it.

Someone reccomended to me using VLOOKUP or HLOOKUP. I have had a play with both but can't get either to work exactly right. Both are close but I haven't been able to dial either in perfectly.
I realise I could just use an =A? but then I have to modify it each time I add cartridges.

Cheers

Nick