I'm quite confident that it's not worth reloading shotgun cartridges at all, unless it's something really niche like bismuth load 10 bore cartridges or something.
Certainly I can't achieve any savings for typical 12 bore steel or lead here in the UK.
Rifles however...
First, I realize that there is a HUGE difference between shooting and reloading here in Montana, USA and doing the same in the UK.
I have been reloading for rifles since I bought my first centerfire rifle, a .30-06, in 1967. I now load 10 different rifle cartridges.
I have been reloading shotgun and pistol cartridges since 1971. I am currently reloading 4 different shotgun gauges and 6 different pistol cartridges.
In the early '70s I also got into casting my own lead bullets. I now cast for most of my rifles, all of my pistols, 6 blackpowder rifles and pistols, and 12 gauge slugs.
And in the mid '80s when I was shooting over 10,000 shotgun shells each year, I began making my own lead shot. On my busiest years, I was making over 700 pounds of shot annually.
My reloading bench is set up with 4 Hornady DL 366 progressive shotshell presses (12, 20, 28, and .410) a 12 gauge single stage press, an RCBS Rockchucker press for rifle cartridges, and a Dillon progressive press for pistol, .223, and .308 cartridges.
I have had most of my reloading equipment well over 35 years and it all more than paid for itself many times over.
I am also lucky enough to belong to a gun club that sells reloading components to it's members, and I am able to buy components in quantity lots which is usually an advantage over retail quantities, when the retail stores have them. I buy most of my powder in 8# kegs, rifle and pistol primers in lots of 1,000, and shotgun primers and wads in lots of 5,000.
Our club also sells target load shotgun shells for $6 a box for 12 and 20 gauge, and $9 a box for 28 ga and .410 shells. We sell new shot for $44 a 25# bag, re-dropped shot for $30, and reclaimed shot for #24 a bag.
Most of the lead that I now use to cast my rifle and pistol bullets and my shot, is reclaimed range lead. The last batch of range lead that I smelted had enough copper jackets in it that when I sold it at the recycle plant, it more than paid for the propane that I use to smelt it. So basically, my lead bullets and lead shot is free. My time cost no more to reload than it costs to read and post on these various hunting and shooting Forums.
So, to breakdown some of my reloading costs:
.300 Weatherby
R-P cases at $90/100 divided by 5 loadings per case = $0.080 each
Magnum primers at $34/1,000 = 0.034
Powder at $169/8# = $0.003/grain x 84.5 grains = 0.254
Bullets, Barnes 180 TTSX at $45/50 =
0.900
Total
$1.268 ea x 20 = $25.36/box
Practice loads with
Hornady 168 gr BTHP bullets at $73/250 =
0.290 ea
Total
$ 0.658 ea x 20 = $13.16/box
.308 Win
Range pickups = Free = $0.000
Primer at $30/1,000 = 0.030
Powder at $166/8# = $0.003/grain x 45.0 grains = 0.135
Bullets, Sierra 150 gr SP at $30/100 =
0.300
Total
$0.465 ea x 20 = $9.30/box
12 Gauge Target loads, 1 oz.
Hull, Win AA, Range pickup = Free $0.000
Primer, Fiocchi 616 at $25/1,000 = 0.025
Wads, Claybuster CB-1100 1 oz at $90/5000 = 0.018
Powder at $144/8# = $0.003/grain x 16.8 grains = 0.050
Shot, I make = Free =
0.000
Total
$0.093 ea x 25 = $2.33/box
A savings of $3.67/box from our Club price of $6/box
With New shot at $44/25# = $0.110/oz =
0.110
Total
$0.203 ea x 25 = $5.08/box
A savings of $0.92/box from our Club price of $6/box
With Reclaimed shot at $30/25# = $0.075/oz =
0.075
Total
$0.168 ea x 25 = $4.20/box
A savings of $1.80/box from our Club price of $6/box
28 Gauge Target loads, 3/4 oz.
Hull, Win AA, Range pickup = Free $0.000
Primer, Fiocchi 616 at $25/1,000 = 0.025
Wads, Claybuster CB-5034 3/4 oz at $92/5000 = 0.018
Powder at $140/8# = $0.003/grain x 14.2 grains = 0.043
Shot, I make = Free =
0.000
Total
$0.086 ea x 25 = $2.15/box
A savings of $3.85/box from our Club price of $6/box
With New shot at $44/25# = $0.110/oz x 3/4 oz =
0.083
Total
$0.179 ea x 25 = $4.48/box
A savings of $4.52/box from our Club price of $9/box
With Reclaimed shot at $30/25# = $0.075/oz x 3/4 oz =
0.056
Total
$0.142 ea x 25 = $3.55/box
A savings of $5.45/box from our Club price of $9/box
And one of the best parts about reloading is that I have several years worth of components, so I just shoot, reload, shoot, reload...and don't have to worry about the stores not having any of the ammo that I need.