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i never use it,i believe primarily they use it to try and help control patterns,the one thing i do know ? just as a cartridge with filler , if ur going to use it work ur load up from the start unless ur following a published recipe,it can change ur ballistic's oh and the lee dippers work for dipping it ,i noted that was two products prominently displayed at bpi ,the lee dipper in both shot and umm.. filler
____________________ (happy shootin'-the best way to get empty brass!)
You can buy BPI shot buffer on Midway. I've heard the issue with the process is that the shot and buffer have to be vibrated so that the buffer is evenly distributed between the shot. A manual I read made this out to be a complicated endeavor but did not provide instructions on doing it. All the best buckshot loads I have used had buffer, I think it's quite a good idea.
I have played with buffers, and I'll go so far as to say that for the majority of instances, you don't need them....they can even have detremental effects (such as raising pressures).
I use buffer in my 16 gauge turkey loads (to tighten patterens) and in my nontoxic bismuth handloads (to help keep the shot from fracturing). When using buffer, I weigh it out on a scale, and then to get it evenly distributed between the shot (and this is the key to being successful with buffer), I place it on top of the shot charge and then touch the base with an electric beard trimmer.....the vibration from the trimmer causes the buffer to fall into the spaces between the shot. But be careful....if you do it too long, you end up with all your buffer on the bottom and your shot on the top! I do it until the shot just starts to appear at the top of the wad, then stop and crimp.
......it's more of a pain in the butt than anything else, but in some applications it can be positive.
____________________ "If your dog thinks that you're the greatest, don't go seeking a second opinion."