The key to all patterns is the delivered pellet count. All things being equal, when you use fewer pellets you have smaller patterns. According to these articles, giving a pellet more energy does not make up for a smaller pattern. When you reduce your shot amount by 10%, you will reduce your pattern size by the same amount if you keep the pattern density the same. (Same choke tube?) A two to three inch decrease in pattern size can cause the loss of a bird in competition. Does losing one to two birds per round make up for saving money using less lead? I'm "breaking more targets needy and greedy."
Research noted this:
Full Choke (65%) pellet counts in a 30 inch circle at 40 yards with #7 1/2 oz. shot
- 3/4 oz. (219.7 pellets): about 143 pellets
- 7/8 oz. (295.75 pellets); about 192 pellets
- 1 oz. (338 pellets): about 220 pellets
- 1 1/8 oz. (380.25 pellets): about 247 pellets
- 1 1/4 oz. (422.5 pellets); about 275 pellets
Now, changing to a modified choke or improved cylinder choke decreases the pellet count still condensed at the target even more. (More spread out.) Logical, but I think you get the idea. Do shooters change their choke tubes when they use hot loads to compensate? An old fellow shooter said " I want to have the most pellets to the target to have the best chance of breaking the target." Now I see why a champion shooter here in Ohio shoots full chokes in both barrels of his O/U shotgun in tournaments.
So, good shooters have chosen to load their shells, whether 1 1/8 oz., 1 oz., or 7/8 oz., so they shoot at the same delivered speed. This allows learning the proper lead on targets from load to load. (Smart!) I never realized that a 410 and a 12 gauge load rated at 1200 fps. will have the same speed at the target. (Not the speed, the number of pellets delivered makes the difference.) I have used all three of the aforementioned loads on the same course using the same choke tubes (so I wouldn't get confused more) depending on the targets distance and presentation (like changing choke tubes) and had decent results, but not great results.
As I ramble on, shooting at close targets does make smaller loads more realistic, but affects your consistency in recoil feel expectation and can lead to flinching. Besides, it's fun to "smoke" them and impress your friends. Ha! Let's face it, great shooters don't miss targets because of their cartridge load; it's their mechanics.
Finally, what conclusions did I glean from all this research?
- Using 1 1/8 ounce loads (in a 12 gauge) is better in almost all situations on a sporting clays course. If recoil is a problem, use a semi-auto.
- Settle on a load speed and use it on all presentations to develop consistency and confidence in necessary leading.
- Learn to shoot tighter chokes, even on close presentations. I disagree that light loads should be used for practicing.
- Pattern your shotgun at 40 yards using a 30 inch circle to check your choke tubes and gun alignment.
- To be a serious shooter, shoot the same gun as much as possible. All guns are different.
- You will never convince some shooters that a lighter load is not better! Check out the trap shooting sites.
- All this may be hogwash. So much of shooting is confidence and practice.
I know I rambled on, but I hope you enjoyed and questioned some of my findings.
Remember: We shoot sporting clays to break targets, and we want to have the best chance possible.