![]() If you have 2 #30 bushings, you have very little good reason to expect them to spit out the exact same powder charge, since they dispense weight by using a fixed volume of a fairly constant density substance. If you did not take this into account when doing your "chart comparison", you erred.Īlso, ANY machined item, has a tolerance for error (plus and/or minus dimensions). The same bushing (or UCB setting) used in a single stage like a 600, 700, sizemaster, etc, will always throw more powder than the same bushing will when used in a progressive (grabber/9000). The jarring banging from the power ring sizing and clearing, added to the 4 or 5 other handle strokes, packs the powder much more in the charge bar than you will see if you just throw the bar back and forth to "see what the bushing throws". I cut my teeth on a MEC 310 and still use it for low-handling specialty 12-ga loads (buck, slugs, and the like). Recommendation is merely a suggestion and does not necessarily mean necessary or needed.Ĭheck the bushing throw in the same manner the bushing will be used.Ī progressive machine drives the bar every single stroke, and the collet sizers are very smooth in operation, far far less jarring, shaking, and banging than a single stage power-ring sized press. It just seems to me that the "WARNING" should go farther. A bushing chart definitely isn't a "load data" chart, but merely a reference chart. ![]() Don't worry, I'll try to stay on the road and not run through that curve.Īt least now I know what I need to do.and part of that includes to disregard all of the measuring data that went into formulating the development of the bushing charts and do my own development. The only scales that were used back then were used for metallic reloading, certainly not for shotgun shells. I venture to say that I loaded 15 to 20 thousand rounds without ever having a single problem. I probably loaded three or four cases (and that's when a case was 20 boxes, not ten) every hunting season for years. ![]() reloading consisted of placing the bar, which had pre-sized holes for shot and powder (primarily Greendot), into the reloader and load away. When I started reloading shotshells, there weren't any "bushings" or "charts" or fifty different hulls or powders to choose from either. In any case, ALWAYS CHECK your powder drop with a scale to be sure that the desired load data grain weight is achieved.I know I'm way behind the learning curve when it comes to reloading for the shotgun. This can result in over charging if you work from the same setting and the next container of powder you get is more dense. It is VERY IMPORTANT that you repeat this process with any new container of the same powder because the powder companies allow themselves a 16% tolerance between batches. The result is the volume (cc) of a single grain of powder (VMD) Divide the measure setting you used to drop the charge by the weight of the charge. Using any setting on your powder measure (preferably a whole number), drop a charge of the powder you wish to determine the VMD for. Lee attempts to keep a current list of newer powders and their VMDs on the "Instructions" page of the Lee Precision website. 43cc setting on the Perfect powder measure. 3cc dipper, (because the next larger one is beyond.43 ccs) the. 1064, and the desired charge weight is 4 grains, This can be used to calculate the dipper, disk cavity or powder measure setting required to obtain a desired weight of powder. The Volume Measured Density (VMD) of a powder is the volume in cc's (cubic centimeter) that one grain of powder occupies.
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