Why rolled crimp?

[c_matt92]

I am new to reloading TSS but use to trap shoot heavy and would reload that until I got to where I shot enough I could buy loaded shells in bulk cheaper then reload. I always used the press to give them a crimp and have never dealt with rolled crimps so I'm curious why from the sounds of it most of you guys roll crimp instead of the traditional star fold?

[Fishh2o]

The main reason I like to roll crimp is water proofing the loads. Sure you can seal both but I find the Roll to seal better. I also like the look and I done make a lot of noise back here with a cordless drill. My MEC Sizemaster you can hear across the house.

[hawglips]

With me it's mostly a matter of convenience. Whichever method works with the fit best, that's what I do. Some of my loads are specifically meant to be rolled though.

[Fishh2o]

hawglips


Why are some of your loads specifically meant to be rolled? If I had to guess it would be to lower pressure.

[hawglips]

hawglips


Why are some of your loads specifically meant to be rolled? If I had to guess it would be to lower pressure.

Usually it's just a matter of fit. There is almost always a trade-off between pressure and velocity, so it's typically a wash as to whether you roll crimp to lower it, or back off the powder charge and fold crimp.