looking at a few dealers prices on second hand pistols to try and determine a budget for myself and i noticed something that should have been more obvious to me at the time.

calibre.

stupidly, i didn't think there would be quite as many calibres!

for occasional use (once every couple of weeks) shooting informally at 25yds indoors what realistically do i need?

am i right in thinking there will be a trend with running costs being higher for bigger calibres? for example, are the running costs of a .31 a lot lower than a .44 due to less powder & lead and how much per shot would each work out to (as a rough guide)

what benefits / drawbacks are there with each specific calibre?

what would be a good calibre to start with & what pistols should i look at as a beginner?