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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Crimping ?
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<blockquote data-quote="Toddxusmc" data-source="post: 1552004" data-attributes="member: 108726"><p>The main reason to crimp is to eliminate bullet setback. Setback can cause an increase in pressure to the point of being dangerous. Scott is correct in the fact that with good neck tension on the bullet you don't need to crimp. Myself, I only crimp bullets with a cannelure, using the Lee Factory Crimp die(the ammunition companies crimp with a collet just like the Lee die). The cannalured bullets I use are the 55 & 62gr fmjbt, and I use those mostly for plinking. When loading for CMP or competition I use the Redding full length Type S bushing die and I use the bushing that gives me proper neck tension to securely hold the bullet. I use match bullets without a cannelure and apply a light taper crimp. Between the neck tension and light taper crimp, I eliminate bullet setback without the possibility of deforming the match bullets and this ensures match grade accuracy. I only recommend using the Lee factory crimp die on cannalured bullets as it squeezes the neck into the bullet, and if set wrong ir can actually deform a bullet.</p></blockquote><p></p>
[QUOTE="Toddxusmc, post: 1552004, member: 108726"] The main reason to crimp is to eliminate bullet setback. Setback can cause an increase in pressure to the point of being dangerous. Scott is correct in the fact that with good neck tension on the bullet you don’t need to crimp. Myself, I only crimp bullets with a cannelure, using the Lee Factory Crimp die(the ammunition companies crimp with a collet just like the Lee die). The cannalured bullets I use are the 55 & 62gr fmjbt, and I use those mostly for plinking. When loading for CMP or competition I use the Redding full length Type S bushing die and I use the bushing that gives me proper neck tension to securely hold the bullet. I use match bullets without a cannelure and apply a light taper crimp. Between the neck tension and light taper crimp, I eliminate bullet setback without the possibility of deforming the match bullets and this ensures match grade accuracy. I only recommend using the Lee factory crimp die on cannalured bullets as it squeezes the neck into the bullet, and if set wrong ir can actually deform a bullet. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Crimping ?
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