|
The RCBS Case Master is a great tool for $75. However, it
can be improved quite a bit with a few simple modifications. The picture on the left shows how I upgraded my RCBS Case Master, so that it can measure
.308 caliber bullets accurately enough to help you sort out the bullets that might become flyers in your group. This just requires a
.297" hole (.400" deep) in the top of the post at the left. The importance of making this particular measurement is explained in another
tech tip called "Getting Unexpected Flyers?"
The picture at the right shows ANOTHER upgrade that allows the RCBS Case Master to perform its primary function much
better. When measuring case runout, there is too much "spongy" movement as you roll your cases on the V-blocks. This mechanism is quite
rickety because of the way the V-blocks are secured only to the front rail. I've added a 4" long, stainless steel, horizontal 5/16" square crossbar, that clamps
both sliding V-blocks "down" to the base using another thumbscrew. This upgrade removes all vertical play, and gives you much more accurate readings
without fluxuation. This tool is now a pleasure to use.
I also drilled a .213" hole in the right side of the crossbar. This allows you to measure .224 caliber bullets (or) loaded
cartridges from the most critical part of the ogive. Measuring a whole box of bullets from the ogive is very time consuming, and it requires a bit of finesse.
However, if you ever have to drive for 2 hours to get to a 600 yard rifle range (like I do), you might be glad to have weeded out any bad bullets that could spoil your shooting.
I've found that I usually come across at least 4 - 6 bullets in every box, that will measure significantly different from the others. When you measure different
lots of the same type bullet, you will really see wild variations. It's too bad that RCBS didn't think about incorporating these "extra" features into their Case
Master.
|
