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Hmmm. I reload every cartridge and shell that I shoot, excepting rimfires. I buy rimfire ammo by the case.
That being said, I shoot two or three times a week, though rarely longer than an hour or so per session. One of those sessions is 16 yard Trap...100 birds. Cost is $20 for the birds and $18 for shotshells. The other two sessions are usually 100 rounds of .22s (about $4) at one and then a box of .45ACP at the other ($3.50).
Of course, these sessions are not always the same. I shoot a good bit of black powder and those sessions are fairly inexpensive. During the summers, I shoot more rifle than during the winter. Even there, though, a session will be fifty rounds or less of .22rf, .223, .30-06, .45-70. Costs are very small as the components that I use were pretty much all given to me. The .223s cost the most as I use Sierra MatchKings at about 14 cents per, figure a quarter a round so forty would be $10. That is a session...maybe sixty rounds sometimes.
So it adds up to about fifty dollars a week...most of that is Trap.
Pete