Measure Shoulder Bump Precisely with Harrell’s Bump Collar
Harrell’s Precision sells “semi-custom” full-length bushing dies for the PPC and 6BR chamberings. While the Harrell brothers do not cut the die to spec, they carry a large selection of dies made with slightly different internal dimensions. When you send in your fired brass, the Harrells choose a die from inventory with just the right amount of sizing (diameter reduction) at the top and bottom of the case. Given the quality, and precise fit, Harrell’s full-length dies are a good value at $75.00 plus shipping.
Bump Measuring Collar
The Harrell brothers provide a nice bonus item with each full-length die — a neat, little shoulder bump measuring device as shown in the photo at right. Hornady/Stoney Point sells a stand-alone tool that does the same job, but the Harrell’s bump collar is simpler and faster. To measure your shoulder bump, simply place the Harrell’s bump collar over the front of your deprimed case (before sizing) and measure the OAL with your calipers. Then size the case in your full-length die, replace the collar and repeat the measurement. You want to set your die so the shoulder moves back about .001″ to .0015″ for most applications. (With semi-auto guns you may want more bump.)
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Tags: Bump Collar, Case Sizing, FL Sizing, Harrell's Die, Reloading, Shoulder Bump
And if you’ve never done business with Harrell Brothers, you’re in for a treat. I won’t give any surprises away, let’s just say in this Internet-fueled dog-eat-dog world, Harrell’s does business the old-fashioned way. They’re top-shelf folks.
You can do the same thing with a empty, unprimed pistol case that will come to rest about half way down the shoulder.
The Harrell’s bump collar is really helpful and much easier to use than a pistol case or the Hornady tool.
Be aware however that the length may not be consistent from one collar to the next. I have three Harrel’s 6BR dies and each came with a collar. I had one very long, bad day when two of them wound up on the bench at the same time. Solved it by giving two of them away.