Reloading is an extension of the hobby to me..../ and I've been doing it a long time, so I'd reload regardless of cost....so I can tailor the shells to what I want...
Retail cost on a 12ga shell...1 oz of shot at around 1200 fps/is about $8. I can reload that same shell for under $ 5 a box / and the cost of shot is way up right now at around $44 a bag. But I'm still saving $3 a box.../ and savings are greater on 28ga and .410 ...and about the same on 20ga.
Performance....my reloads are better / more consistent than the cheap retail shells...they're equivalent to a premium shell like Remington STS which retail closer to $ 10 a box. But for casual shooting ...the cheap retail shells are fine...for 16 yd Trap, Skeet, etc...
Tailoring a load....like a 7/8 oz shell for a 12ga ( which is a typical 20ga load )...or even reloading a 3/4oz shell for a 12ga ( which is a typical 28ga load ) ....because I want less recoil, or I want less expensive shell, something for the grandkids to shoot, etc....is where reloading really pays off. At 3/4 oz of shot, that 12 ga shell costs me under $4 a box...and gives me versatility...
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Besides, reality is --- since I reload, I shoot 2 or 3 times more with the same ammo budget ...on shotshells and metallic...because I reload 12ga, 20ga, 28ga , .410 ...and metallic in 9mm, .40 , .45 acp, .357 mag and .44 mag...
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so get the press set up ...buy some components and give it a try ....you might like it / but if all you care about is saving money, yes it'll help ...but that's not really the issue in my view.