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Mine is 0.434".
 

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.433 would be a 11mm drill......they are never perfect. All that matters is what measured powder charge they throw. Most will throw light and you have to use a step larger to get the correct drop. Powders vary on weight compared to volume. The measured weight is all that matters.
 

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Mec Bushings
Powder # Decimal
Mec 10 .264
Mec 11 .272
Mec 12 .280
Mec 13 .298
Mec 14 .312
Mec 15 .318
Mec 16 .329
Mec 17 .335
Mec 18 .342
Mec 19 .350
Mec 20 .356
Mec 21 .365
Mec 22 .374
Mec 23 .381
Mec 24 .389
Mec 25 .395
Mec 26 .409
Mec 27 .412
Mec 28 .420
Mec 29 .427
Mec 30 .436
Mec 31 .443
Mec 32 .451
Mec 33 .459
Mec 34 .467
Mec 35 .470
Mec 36 .483
Mec 37 .490
Mec 38 .498
Mec 38 A .508
Mec 39 .510
Mec 40 .530
 
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