The elderly Jr represents something approaching the optimum configuration of the basic principle. Similarly, an increased range of ram movement demands an increase in the arc described by the handle. All other things being equal, upscaling the basic design requires longer and longer handles, to increase working pressure. In my RCBS Jr machine the first-class Lever principle works well. Does that mean that all presses are equal? Not a bit of it. To reduce that to a simple equation: WORK = FORCE x DISTANCE. Ignoring losses due to inefficiencies, the machine is therefore a direct force multiplier in the ratio of the distances moved by the lever. A small effort over a large distance on the long end of the beam will be translated into a multiplied effort over a proportionally shorter distance at the other end. ![]() So, what do we mean? In its’ simplest form it is a rigid beam unequally supported by a hinge or fulcrum (pivot). He is quoted as saying: “Give me a lever and a place to stand and I will move the earth.” However, its first use is likely to date much further back in history to the builders of stone circles such as Stonehenge or the Egyptian engineers who raised massive stone obelisks around three thousand years B.C. The mechanical concept at the heart of the press, the lever and fulcrum, can be traced to the writings of Archimedes in the 3rd Century B.C. Although approaching 50, it still gets the job done, well, some of them! Shifting obelisks Stamped near the 7/8” x 14 TPI thread for the dies is the number 69, indicating its year of construction. Mine was a lightly used O-frame RCBS Jr with a set of steel. Hardly the best means of selecting the machine at the heart of our reloading activities. Your very first one was probably a second-hand cast-off from someone at the club, bought as part of a reloading ‘kit’ or the cheapest one in the local gun shop. You can polish the funnels on the Dillon measures to get a more consistent 'throw' which helps.The reloading press is undoubtedly the most fundamental piece of kit in the handloading workshop. I use a RCBS ChargeMaster 1500 to measure the powder for the majority of my target rounds using stick powders.įor short ranges, the SD on the Dillon PM isn't that high for say <500 yards and therefore it's fine for most people's needs. I don't think that the 650 has enough clearance to load the 338LM, nor do I believe that they make a shell plate to hold the brass, but I maybe wrong on this account. If you aren't getting the charge accuracy you want you can still throw each powder charge separately and it is much more efficient to load on a progressive. ![]() Also, don't forget to take some time when running the press for the powder to both drop into the bar and into the case. ![]() If you take the powder bar out and give it a good polish with either some 6-800 grit sandpaper or a dremel, you will reap some vast improvements in its performance. Obviously powder choice can make a big difference as long stick powders will cause some hiccups. Its good for doing pistol and rifle rounds in mass quanity for plinking and such.īut when it comes to making accurate or wanting to make accurate rounds to go with a single stage press has the correct amount of powder is crucial. Originally Posted By: sharpshooter08I have a 650 and have been told that the dillon powder dispenser is unrealiable for loading accurate loads.
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