The Bushing Full Length Sizing Die offers advanced precision by allowing you to precisely control the amount of neck sizing tension in your reloaded brass while sizing the body and bumping the shoulder.
This die improves accuracy and prolongs case life because the case’s shoulder and body is sized down just enough to fit in a minimum-sized SAAMI rifle chamber, and bushing limits working of the neck.
Bushing Full-Length Sizing Dies come with an etched line on the die and an Accu-ring. The combination of these reference marks makes it easier to set up your sizing and seating dies by helping you to zero in on what you want the headspace length of your cases to be. This die kit comes with .284, .286, and .288 diameter neck bushings.
Bushing selection hints
#1 Each brand of brass will have a different neck wall thickness so there is no “Universal” diameter.
#2 Determining bushing size is a straight forward assessment. You will need to assess the neck wall thickness of the brass you are going to use. So lets say that you have some 308 Win Lapua brass. And, with a ball micrometer you have measured several cases. The average of the measurements comes out to be 0.015”. So we then multiply 0.015 by 2 = 0.030”. Then add the bullet diameter 0.308” to the neck wall measurement 0.030” to arrive at 0.338”
#3 A consensus for determining the bushing size is based on the type of rifle you are using.
A - for a bolt action rifle not using through the magazine 0.001” spring back would give you adequate neck tension. So, we deduct that 0.001 from our 0.338” measurement and arrive at a bushing size of 0.337”
B – for a bolt action feeding rounds through the magazine 0.002” spring back would give you adequate neck tension. So, we deduct that 0.002 from our 0.338” measurement and arrive at a bushing size of 0.336”
C – for a semi auto rifle feeding rounds through the magazine 0.003” spring back would give you adequate neck tension. So, we deduct that 0.003 from our 0.338” measurement and arrive at a bushing size of 0.335”
