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Modify Lee factory crimp die for straight wall ctg
Posted By: Willbird
Date: 7/6/20 03:27
Not my idea, stolen from a source who stole it from a source who did it for 450 Bushmaster.
End result looks like this. Got there by shortening a 35 Remington Factory Crimp die and narrowing the width of the crimping band. For this ctg which is a rimless 357 maximum a 35 Herett die might work better, does not need shortened as much as the 35 remington did.
This should work well for any case that headspaces on case mouth.
This picture from the 450BM article shows what narrowing the width accomplishes.
Detailed article about 450 Bushmaster here.
For those who do not like to Dremel and lathe I have heard that Lee will make customs for not a lot of dough, so you trick them by providing a shorter sample ctg...if you wanted the crimp down .100 on a 300 BO you would send them a sample case .100 or more shorter, they make your crimp die to crimp the case mouth of that sample case, and it ends up down .100 on your real ctg. You then easily narrow the width.
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