Fishing Tackle - Split Shot
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Preferred split shot sizes
The only shot you need are SSG, AAA, BB, #3, #6 and maybe some dust.
It is not obvious from the list above but -
1 SSG = 2xAAA = 4xBB = 8x#3 = 16x#6
'Dust' is #8 or smaller. You will probably never need it. It is rare I need anything smaller than #3 on a river unless using a fixed spool reel when #6 can help a little.
The point is that with combinations of just 5 different sizes you can make up any weight to within a sixteenth of an SSG (about a gram.)
Beware: some tackle dealers will insist that #4 is half a BB, they are wrong, it is too light.
Never believe the figure printed on the side of a commercial float, it is rarely within 20% of the correct figure. Get a tall bottle or use a waterbut or similar and test shot your floats at home then paint the true value on the side - It's not worth going finer than #3 in this process as you will always have to adjust for the weight of the bait and weather conditions at the waterside so ultra-precise measures will be wasted.
Unless stated otherwise: Everything in this site refers to fishing in the British Isles and similar northern European waters.