Hi Jack, Federal Hull trimmed to 2 7/8", Fiocchi 616 (209) primer, 19gr of Red Dot, SP10 wad, 1/2" fiber wad, 1 1/8 ounce of shot, 6 point crimp.

19 grains of RD feels pretty tame in the 10ga. I don't know what it develops for pressure but you can find 19 to 20 gr loads of Red Dot pushing 1 1/8 ounce in Federal 12ga hulls with that primer at 8200psi. Pressure will be lower in a 10. I found with the Short Ten many readily available powders; Red Dot, Green Dot, 700-x work great but we have been left for the most part to use our head and come up with some loads of our own.

Pete,

That is what I was hoping you would say. I had been planning on using SR7625 but was wanting some options. It looks like I've found them now. My other components are the same as yours. I have a #3 frame Parker hammer gun and a early E grade Lefever both in 10 ga with pretty heavy barrels and 3" chambers.

Jack Kuzepski

22 grains of Green Dot works well too, uses a little less filler than 1/2". 7625 is a good powder, the 32gr load of it with same components with 1 1/8 ounce is really loud. People will ask you what are you shooting. 7625 is also expensive compared to the Dot powders but is still a good choice.

Jent, what do you consider a (too) light load of SR7625 is in the 10ga?

Catastrophic gun failure due to the condition called detonation in a shotgun is very unlikely if not impossible. It is an easy fall back to blame an over pressure condition created by a barrel blockage or an overcharge from too much powder or the wrong powder (too fast).

In metallic cartridge loading it is thought the gap between a seated bullet and a small amount of powder can create the conditions for a detonation. This condition can't exist in a shot shell because wads are seated on the powder and the seating of the wad is insured by crimping the shell. If such a large space were to exist the shell could not be crimped properly and it will dish in. Shotgun shell detonation from too little powder is myth, there is no scientific testing that proves this can happen.

Jent, detonation is at best a controversial phenom because the action of the load doing what you state in your post has never been observed in a scientific manner in a pistol, rifle or shotgun. Alliant when they were in business, had a pamphlet about using reduced loads in pistols, they addressed the issue of detonation, their result, Alliant could not create a detonation in their tests. The NRA commissioned H.P. White Lab to prove or disprove detonation could occur in a 38 special (because a lot of 38 specs were blowing up), they tried to do it and they could not make a detonation happen. What they did find is double and triple charges of fast powder were needed to damage the revolver in their tests. Their conclusion, reports of detonation were actually the result of an overload.

Detonation remains a theory, it has not be proven in spite of attempts to create it, since it has not been proven it remains a myth.

Damage to a gun is caused by overpressure (or material failure of the barrel/receiver). Overpressure can be created by a barrel obstruction, too much powder, or the wrong powder.

On your other points, yes I have now been warned about 7625, but you have been warned to not shoot nitro powder loads in composite barrels, if you ask around on many other websites and gun clubs you'll get the same advice, don't do it, yet you shoot damascus and twist barrel guns with nitro loads. So what are such warnings really worth?

I now see why Remington advertised their double guns, whether composite or fluid as "Guaranteed for Nitro Powder". Scott K. brought his tools with him to the trap range last night.

Bores are L - .790 with .045 of choke, R - .789 with .046 of choke, choke taper is about 4 1/2" long.

Barrel walls about 1 inch in front of forcing cone are .165 and about 8 inches from the muzzle they measure .100

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