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Discussion Starter · #1 ·
Whatsup guys. So I’ve been going down a worm hole in developing loads for the 410. Being in a lead free state I have to use strictly non toxic. The 410 really doesn’t hold enough steel to have a dense pattern for smaller game like quail and dove which is why I’m tinkering. I picked up some rotometal #8 bismuth because of the 37% pellet increase it has over the #7. Anyone have the data for #8 bismuth around 1300fps compared to a #7 bismuth at 1200? I’ve got some bismuth 410 loads screaming at 1500+ fps but don’t pattern well until I get into the low 1400s. Hoping I can get adequate penetration with the 8s as low as 1300fps.
 

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The Bismuth #8 shot at 1300 fps looks like it would be a good Dove load.

From KPY Shotshell Ballistics
1300 fps Bismuth #8 shot gets .80 inches of penetration at 35.9 yards and is going 596 fps at 35.9 yards with about 232 pellets in 1/2 ounce.

1200 fps Bismuth #7 shot gets .99 inches of penetration at 36.0 yards and is going 607 fps at 36.0 yards with about 169 pellets in 1/2 ounce.

Look at how the 100 fps slower starting #7 shot is going faster at 36.0 yards than the Bismuth #8 shot is, even though the Bismuth #8 shot started out faster.
 

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Discussion Starter · #3 ·
The Bismuth #8 shot at 1300 fps looks like it would be a good Dove load.

From KPY Shotshell Ballistics
1300 fps Bismuth #8 shot gets .80 inches of penetration at 35.9 yards and is going 596 fps at 35.9 yards with about 232 pellets in 1/2 ounce.

1200 fps Bismuth #7 shot gets .99 inches of penetration at 36.0 yards and is going 607 fps at 36.0 yards with about 169 pellets in 1/2 ounce.

Look at how the 100 fps slower starting #7 shot is going faster at 36.0 yards than the Bismuth #8 shot is, even though the Bismuth #8 shot started out faster.
So sounds like my initial plan of a hot bismuth #8 load is not necessarily needed. Good to know I can dial it down a touch and and get a better pattern. Thanks for that info, will be trying out the 1300fps bismuth 8 load this weekend and will report back.
 

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There’s a guy I talk with in Louisiana who only shoots 2.5” .410, and has worked pretty extensively with Bismuth 7’s and 8’s. He hunts squirrels, dove, and ducks with these loads. We both developed almost identical loads with charge, powder, and wads.
Here’s about what we came up with:
2.5” Straight walled hull (I use mostly Fio and Cheddite), Fio or Cheddite primer
16grain of h110 powder
Sp410 wad
190-202 grain of shot

fold crimp. I’ve tried this load with 5’s and it was too thin. 6’s show some promise, and he has had field success with 7’s and 8’s on small game, and clay targets, patterns at 40yards.

3” is very similar with 1 more grain of powder and a 3” wad like the max.410, 0.47oz of shot. 6’s pattern nicely
 
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