I know many of you use the so called Jim Kidwell or “Kidwell” bullet in your .40 caliber rifles as I do in my Shiloh Sharps 1874 Sporter. Be aware that until recently BACO’s designation for the mould was JIM409400M4, which was incorrect since the 1st three driving bands are reduced. While doing some research on BACO’s bullet moulds I found 6 moulds/bullets that were either incorrectly identified or had typos in the designation and/or description. Subsequently, around the end of January sent a letter to BACO identifying the errors which have since been corrected. Therefore the JIM409400M4 is now correctly identified as JIM409400M5.
Refer to the following information if you are not familiar with BACOs designations. But keep in mind that there may be possible exceptions.
JIMDDDWWWXY (BACO's mould format)
• JIM: the guy that makes all the moulds.
• DDD: the bullet diameter (0.000”) as cast with 20:1 alloy
• WWW: the bullet weight (grains) with 20:1 alloy
• X or sometimes XX: designates the bullet nose design and other characteristics as per the following list:
C – Creedmoor nose
E – Elliptical nose
FN – Flat nose
M – Money bullet nose
P – Postell nose
S – Spitzer nose
T – bullet is tapered over the full length (i.e. the band diameters get larger from nose to base).
HB – Hollow base
GC – Gas check base
• Y: designates how many bands are tapered as indicated below:
1 - No bands reduced
2 - Tapered 1st band
3 - 1st band reduced
4 - 1st two bands reduced
5 - 1st three bands reduced
6 - 1st four bands reduced
Therefore the JIM409400M5 “Kidwell” mould as made by Jim (not Jim Kidwell
) will, when using 20:1 alloy, produce a 0.409” diameter bullet weighing 400grs, has a "money bullet" nose and the diameter of the 1st three driving bands are reduced (less than 0.409” for this example).I hope this helps.
Wayne
