Picked up a few different brands of 2-3/4" 00 and #4 buckshot to see how it prints...
Left to right - Spartan 00, Olin Corp 00, Rio Royal 00, Hevi-Shot #4, Federal #4
All rounds were fired at 10 yd through my 930 Tactical...
Here are the results on target:
Spartan 2-3/4" 00 Buck:
MFG#: SA1200
Pellets: 9
Velocity: 1315 fps
Actual Length: 2.27"
Price: $12.99 / 25 rounds ($.52 a round)
The Spartan 00 buck had a 6" shot spread with decent gouping and the wad punched through the neck...
Olin Corp "Military Grade" 2-3/4" 00 Buck:
MFG#: Q1544
Pellets: 9
Velocity: 1,325 fps
Actual Length: 2.34"
Price: $4.79 / 5 rounds ($.96 a round)
The Olin Corp. 00 buck also had a 6" shot spread with a star shaped gouping and the wad punched through at the bottom of the pattern...
Rio Royal 2-3/4" 00 Buck:
MFG#: RB129
Pellets: 9
Velocity: 1,345 fps
Actual Length: 2.49"
Price: $3.49 / 5 rounds ($.70 a round)
The Rio 00 buck put up a 5-1/2" shot spread. In all reality it consisted of a 3" group of 8 pellets with one flyer. On this one, the wad punched through the target backer at the right elbow about three inches off the paper...
Hevi-Shot "HEVI-Duty" 2-3/4" #4 Buck:
MFG#: 91004
Pellets: 30 (Frangible on rock and steel)
Velocity: 1250 fps (low recoil)
Actual Length: 2.32"
Price: $8.99 / 5 rounds ($1.79 a round)
The Hevi-Shot HEVI-Duty #4 buck put up an 18.5" pattern with the wad punching through at the lower right bicep...
The surprise here was that the 30 pellets turned into 173 individual projectiles that punctured the target at 10 yards. Apparently these frangible pellets begin to fragment inside the barrel. There were several pellets that made it through the target in tact, so I would venture a guess that the pellets closest to the powder are crushed between the wad and the forward pellets upon ignition. Here is a negative of the image that better shows the punctures from the smaller fragments...
Federal Premium Power Shok 2-3/4" #4 Buck:
MFG#: F1274B
Pellets: 27
Velocity: 1325 fps
Actual Length: 2.34"
Price: $4.79 / 5 rounds ($.96 a round)
The Federal #4 buck put up a 9" shot spread with an excellent pattern. The wad went through the target just outside and below the left shoulder...
I brought a some Winchester PDX-1 buck and ball to test out as well...
Winchester Supreme Elite PDX1 Defender:
MFG#: S12PDX1
Pellets: 3 pellet 00 Buckshot over 1 oz slug
Velocity: 1150 fps
Actual Length: 2.33"
Price: $14.29 / 10 rounds ($1.43 a round)
The PDX1 buck and ball put up a nice 5.25" spread. If a giant hole in the chest surrounded by three smaller holes isn't enough, the wad smacked Mr. target right in the face. I have to say this was a LOT better result than I expected for this type of round...
All things considered, I'd say the Rio Royal 00 buck won the day. It put up the tightest pattern and at $.70 a round it is still cost effective to use as a practice round. I also like the fact that Rio is based about 55 miles from me in west Tennessee. The Spartan 00 buck also preformed well and at $.52 a round it's hard to beat for practice/range ammo. At the end of the day all my HD shotguns are loaded with Rio...

Left to right - Spartan 00, Olin Corp 00, Rio Royal 00, Hevi-Shot #4, Federal #4
All rounds were fired at 10 yd through my 930 Tactical...

Here are the results on target:
Spartan 2-3/4" 00 Buck:
MFG#: SA1200
Pellets: 9
Velocity: 1315 fps
Actual Length: 2.27"
Price: $12.99 / 25 rounds ($.52 a round)

The Spartan 00 buck had a 6" shot spread with decent gouping and the wad punched through the neck...

Olin Corp "Military Grade" 2-3/4" 00 Buck:
MFG#: Q1544
Pellets: 9
Velocity: 1,325 fps
Actual Length: 2.34"
Price: $4.79 / 5 rounds ($.96 a round)

The Olin Corp. 00 buck also had a 6" shot spread with a star shaped gouping and the wad punched through at the bottom of the pattern...

Rio Royal 2-3/4" 00 Buck:
MFG#: RB129
Pellets: 9
Velocity: 1,345 fps
Actual Length: 2.49"
Price: $3.49 / 5 rounds ($.70 a round)

The Rio 00 buck put up a 5-1/2" shot spread. In all reality it consisted of a 3" group of 8 pellets with one flyer. On this one, the wad punched through the target backer at the right elbow about three inches off the paper...

Hevi-Shot "HEVI-Duty" 2-3/4" #4 Buck:
MFG#: 91004
Pellets: 30 (Frangible on rock and steel)
Velocity: 1250 fps (low recoil)
Actual Length: 2.32"
Price: $8.99 / 5 rounds ($1.79 a round)

The Hevi-Shot HEVI-Duty #4 buck put up an 18.5" pattern with the wad punching through at the lower right bicep...

The surprise here was that the 30 pellets turned into 173 individual projectiles that punctured the target at 10 yards. Apparently these frangible pellets begin to fragment inside the barrel. There were several pellets that made it through the target in tact, so I would venture a guess that the pellets closest to the powder are crushed between the wad and the forward pellets upon ignition. Here is a negative of the image that better shows the punctures from the smaller fragments...

Federal Premium Power Shok 2-3/4" #4 Buck:
MFG#: F1274B
Pellets: 27
Velocity: 1325 fps
Actual Length: 2.34"
Price: $4.79 / 5 rounds ($.96 a round)

The Federal #4 buck put up a 9" shot spread with an excellent pattern. The wad went through the target just outside and below the left shoulder...

I brought a some Winchester PDX-1 buck and ball to test out as well...
Winchester Supreme Elite PDX1 Defender:
MFG#: S12PDX1
Pellets: 3 pellet 00 Buckshot over 1 oz slug
Velocity: 1150 fps
Actual Length: 2.33"
Price: $14.29 / 10 rounds ($1.43 a round)

The PDX1 buck and ball put up a nice 5.25" spread. If a giant hole in the chest surrounded by three smaller holes isn't enough, the wad smacked Mr. target right in the face. I have to say this was a LOT better result than I expected for this type of round...

All things considered, I'd say the Rio Royal 00 buck won the day. It put up the tightest pattern and at $.70 a round it is still cost effective to use as a practice round. I also like the fact that Rio is based about 55 miles from me in west Tennessee. The Spartan 00 buck also preformed well and at $.52 a round it's hard to beat for practice/range ammo. At the end of the day all my HD shotguns are loaded with Rio...