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Conversion kit

I am looking to purchase a Dillon 550B press and just have a few questions I reload .257 Roberts, 9mm, .45 and .270 do I need to buy a conversion kit for each one and is there a back order currently on the 550B? Thank you all for your time

I pulled the following from the Caliber conversion charts in the owner manual (available online).  The summary of what you need follows each kit needs. Looks like you can trim to two kits and just two powder funnels.  Of course you will need to add dies.  Dillon can respond to back orders. Well worth the wait!  There might be some dealers that have new kits if you just cannot wait.

.25-06, .250, .257 Roberts, Ackley - # 20147
#1 Shellplate - # 13692
#K Powder Funnel - # 13216
#1 Locator Pin - # 13930

9mm, .38 Super - # 20127
#5 Shellplate - # 13743
#F Powder Funnel - # 13806
#3 Locator Pin - # 14060

.45 ACP - # 20126
#1 Shellplate - # 13692
#E Powder Funnel - # 13782
#1 Locator Pin - # 13930

.270 Win, 7x57, .284 Win - # 20142
#1 Shellplate - # 13692
#J Powder Funnel - # 13456
#1 Locator Pin - # 13930

Purchase the 9mm and .45 acp conversion kits and add
#K Powder Funnel - # 13216 for .257 Roberts
#J Powder Funnel - # 13456 for .270 Win

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