I've patterned a few of them yes, not on paper where I can really study them ....but on the steel pattern board at the club...and they're fine for Skeet practice.../ and I took a look at them alongside my stand alone 28ga reloads as well....and they're comparable. Both had a good effective 30" pattern at 21 yds with a Skeet choke. ( we were testing my buddies shells/he gave me a box to test/...but it'll be the same recipe that I'll use ).
3/4 oz of 8's ...whether its out of a 28ga or a 12ga....gives you about 307 pellets.
7/8 oz ( of 8's ) is about 358 pellets ...and 1 oz is about 409 pellets...
( and if you can't break it with 307 # 8's....then it probably won't matter if you throw 409 pellets out there at them ....)...???
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The reason I'm playing around with 3/4 oz in 12ga and 20ga both...( to save money on shot, sure )....but it gives me two other guns to shoot, rather than just the 28ga...and while I really like my 28ga gun ( its identical to my 20ga over under )....the 28ga hulls are brittle, prone to cracking, some of the STS hulls are breaking at the shot cup even after 1 or 2 firings..../ so using a STS hull in 20ga or 12ga...with 3/4 oz of shot at around 1225 fps....will give those hulls almost an infinite life...and less recoil..and save money on shot.
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A lot of my buddies shoot 7/8 oz almost exclusively for 12ga...for Trap, Skeet, etc.....
and shooting 3/4 oz ...for some of the older retired guys at our club...means they can still afford to shoot, even though they're on fixed incomes...with the price of shot well over $ 40 for a 25 lb bag these days....and cost of targets ..and gas...etc....
The 3/4 oz shells in a 20ga or 12ga.....give me some other loads for the grandkids to shoot as well...make sure they are not affected by recoil on heavier payload shells.
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I have a Benelli Super Sport semi-auto in 12ga and a 20ga ...( synthetic stock, clays guns, comfort tech systems in them ...Inertia guns )....and both the 12ga and 20g guns, so far, ran fine with my test loads 3/4 oz at 1225 fps or so....and I was happy that both of those guns ran well, because I use them as training guns for the young teenage grand kids that don't have a lot of upper body strength yet....because they're real light guns.
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12ga load 3/4oz of 8's, Hodgdon Clays 17.2 gr, wad is CB-0175-12 and win 209 primer - velocity is about 1225 fps....
20ga load 3/4 oz of 8's, Hodgdon International 14.4 gr , wad is CB 1034-20 and velocity is about 1225 fps and pressure is about 11,000 psi
both using Rem 2 3/4" STS hulls..