Are you sure that you are really a Scot Al?
I worked out my costings for .308w the other day and this is what they came to;
.308win
Sako Hammer Head £12.50:50 = £25:100 i.e. 25p each
Primers S&B £32:1000 3.2p each
TR140 £52/Kg 367 rounds to the Kilogram 15p per load.
I normally disregard cases but the last lot of once fired Lapua cases were £10 per hundred and came from a very reputable source which I will not divulge. I get at least 8 loadings from each case more if I only necksize. What if we are extremely generous and allow say 5p per reload.
The total comes to 48.2p per round or
£48.20:100 or £9.64:20
I am however very careful with my money, an honoury Scot perhaps?
A friend of mine who is a Yorkshireman and an accountant to boot thinks that I spend too much and he is sure that he can do even better than me. He haggles over everything and I'm sure that retailers just get worn down by him and pay him to take goods away.
In reality it's where you buy and where you are in the country can make quite a difference.