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For sale here. Believe I could safely shoot these out of 2 1/2" chambers.
https://ammo.com/shotgun/12-ga-ammo

[Linked Image from i.imgur.com]
Independent testing when the load was first released, when it was 15/16 oz. reported 6,200 psi.
I tried the load, and it was so slow I needed quite a bit more lead at skeet target distances. Trap was hopeless.
I found that the 980 Fps velocity on these shells to be almost too anemic for any practical purpose. They are light recoiling though.
Well, I ordered a flat. Will give them a try. Scarcity breeds desperation. Still feel ok shooting the Federals out of the Frenchie.
Don't shoot it on a windy day. My son shot a box at backyard targets and only broke a couple birds. Switched to my low pressure reloads and he started crushing them.
Originally Posted by Argo44
For sale here. Believe I could safely shoot these out of 2 1/2" chambers.
https://ammo.com/shotgun/12-ga-ammo

[Linked Image from i.imgur.com]

I do.
I bought several boxes at Walmart today! I have not seen these in many years. When my Daughter was just starting out she used these. They worked good enough to be high youth shooter beating several boys!
Go s****
They don’t work well in newer guns with backbored barrels. That said, in the typically tight 18-18.2mm French guns that have been around the place, I couldn’t tell much of a difference at trap and skeet range.

I would further suggest that on wild pheasants, you consider something else. Don’t ask me how I know that.

Best,
Ted
21 gramme (about 7/8 oz) is a popular and widely available budget clays load in the UK.

The 12G loads I use (Hull Cartridge Company - CompX 21g) are 21g shot size 7 1/2 and in a 2 1/2" case with fibre wads. Velocity (claimed by manufacturer) is 1425 (which I presume is feet per second).

I have no idea on pressure as it is never quoted or mentioned in the UK. All commercial loads have to be CIP compliant and that's all there is to it.

I would not use them on live quarry (for one thing they are only available in shot sizes 7 1/2 and 9), but that is not what they are intended for.
John: different maker and old data, but possibly helpful
Kent/Gamebore English Field 12g 2 1/2” White Gold XLR 21gm (3/4 oz.) was listed at 1250 fps with a pressure of 7975 psi
You are right, 21g is 3/4 oz. My mistake. However the other data is current from Hull Cartridge Co's website here https://www.hullcartridge.co.uk/clay/cartridges/comp-x

21g is a popular load for clays here and several makes are widely available, Eley, Hull, Fiocchi, Lyevale/Express. They are well suited to older guns.
British muzzle velocity figures can be confusing to us Yanks. I remember reading Gough Thomas who reported the muzzle velocity of shells he was testing at 1070 fps. (Standard game loads.) That is "observed velocity," which is the average over 20 yards (or meters, I forget which.) Those loads have a velocity of 1175 fps as we measure MV on this side of the pond--which is at 3 feet from the muzzle. On the other hand, if you get a British MV reading in the 1400 fps range, that's almost certainly taken at the muzzle. "True" muzzle velocity, which is faster in comparison to our 3 foot velocity.

When shooting on cold days (much below freezing) on skeet squads with a shooter who's using those low recoil loads, they tend to sound decidedly "poofy". But then most shooters aren't as crazy as some of us in northern Wisconsin are. They're doing something other than shooting targets when it's that cold.
What Larry said, but it doesn't need to be confusing.
The Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives standard is to report velocity at 2.5 meters = 8.2 feet from the muzzle.
https://www.cip-bobp.org/en/cip

Velocity at the SAAMI standard of 3 feet is about 70 fps less than the muzzle.

Apparently if British shells are for domestic use, the domestic maker can use British standards. Maybe a British correspondent could confirm.
If for export (clearly applicable to the current Italian and Spanish products) the shot size and speed is reported in "American"
More than enough velocity for snipe and woodcock, especially woodcock shot at dog held range. Gil
Shells arrived. Turns out the load is 26 grams, 15/16 oz as Drew originally posted, not 7/8. I'll be shooting them in a Saint Etienne 1926 Wonder 12 bore (18.2) with 3/4 chokes in each barrel chambered for 65mm, 27 1/2" barrels and plenty of metal (I've actually shot the Federal 1 1/8" oz 1145 fps 2 3/4 rounds in this gun without a problem); And an 1897 Reilly 12 bore Damascus 30" barrels SxS choked cylinder and 1/4, 2 1/2" chambers. We'll see how they do. Right now I'd opt for a sling shot. (One could always shoot the 870's but....life is short).
It's a popular load with the cowboy shooters, especially among the competitive shooters and those shooters that are recoil sensitive. I'll agree that the load borders on useless for skeet and trap.
There is a lot of experience on this board with this load. Today was my first try, though, shooting them from French 1926 2 1/2" chambered "Wonder."

I was truly surprised at the pep. I thought they'd sort of fall out of the barrel. It was a cold day by Virginia standards (summerish for Ted and the Canadians). They worked very well on sporting clays. I don't shoot much skeet or trap so the experienced opinions for those games posted here are valid. But I will be shooting the Damascus 12 with them this weekend. Again, quite a pleasant surprise. They should do till RST gets back up to speed unless I can find a better commercial shell for 2 1/2" chambered 125 year old Damascus.
Gene,
Bet your French gun has tight bores. They work best in guns that are snug. My lefty Darne had a fearsome backbore perpetrated on it, some time before my ownership. They didn’t work in that one.

I would think you might get away with hunting Snipe, woodcock, grouse, or quail with the 7 1/2 loading. Pheasants, not so much.

Best,
Ted
Argo,
Since the unavailability of RST shells, I've been shooting Fiocchi and Rio 12 ga. 2 3/4" 7/8 oz. at 1200 fps loads with great results in my 2 1/2" chambered Churchill. Basically a soft shooting 20 ga. load is what it feels like to me.
Karl
Thanks Karl, a great suggestion. I'll look for availability. Yes Ted, the Wonder is 12 bore but 18.2 barrel tubes choked 3/4, 3/4.
Gene, I’ve used them for ruffed grouse. Worked just fine. Not sure I would use them on hardier birds. And they work just fine on the skeet range for me but I’m a very casual clays shooter.

And not that many of us do it all that often but they are great for introducing a new shooter to the concept of recoil. Particularly women. I have a couple light 12s and with this load, recoil is barely felt.
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