Checking Lead Hardness With Drawing Pencils - Cast Bullet Forum
2019年6月27日 · This describes a method for the determination of lead alloy hardness. It is a simple, quick, and economical means to test hardness of unknown alloys, and I have found it to be reliable and accurate. Using a common staple gun, I have found that measuring the penetration of the staple into the alloy can be used to determine relative hardness when ...
Homemade Lead Harness Tester - Cast Bullet Forum
2014年3月29日 · Initial tests with 1 lb ingots shows much promise. I am thinking about using a heavier spring to make a larger indent and using the standard Brinell hardness formula instead of comparing the results to pure lead. As I mentioned above, a 10 mm ball penetrator is the industry standard for Brinell hardness testing.
Lee Lead Hardness Test Kit Microscope Stand - Very Helpful Tool
2020年7月6日 · Last week I got this stand designed to hold the Lee lead hardness test microscope. The thing is really helpful for holding the scope still and adjusting until the picture is clear and focused. It makes reading the dimple very easy.
.44mag bullet hardness. - Cast Bullet Forum
2010年5月4日 · Before I invest in molds for the .44 .430 bullet, I would like to know if a lead cast bullet traveling at .44mag velocity will lead the bore. If I have to settle for velocities in the 750 to 850fps range to prevent leading wouldn't staying with my .45lc .452 caliber be just as good, or will those velocities drop to 500 -650fps? ?
Mixing linotype with straight lead - Cast Bullet Forum
2009年10月26日 · Lead does not give off fumes below 900F, but above 900 it does, and the fumes are odourless and colourless. I am perfectly happy to keep using WW type alloys and then when a harder alloy is required, I can heat treat to reach max hardness and anneal to bring that hardness back down to whatever is needed.
25:1 lead/tin. What Brinell.? - Cast Bullet Forum
2015年9月12日 · Checking hardness to check or verify that you have those alloys is only as accurate as your mix and your measuring tool. In actuality, simply using 25 parts or 30 parts certified pure lead and 1 part certified pure tin gives you exactly what you want regardless of what your measuring tool says.
Alloy of tin and lead - Cast Bullet Forum
2016年12月21日 · For full charge loads in 9mm, .45 ACP and .357 Magnum you want to use something other than a tin-lead alloy. 1 to 30 tin-lead is about 9 BHN and works well for revolver bullets up through .38 Special +P, .44-40 and .45 Colt, but for autopistol and magnum loads you want harder alloy of 12-13 BHN.
lead hardness tester - Cast Bullet Forum
2006年12月5日 · 454PB wrote: Ed Harris wrote: I use a hardness tester made by Tioga Engineering which fits into my reloading press. It uses a calibrated spring and 10mm ball to apply a load to the sample and you read the diameter of the indent using a 10x magnifier with a calibrated vernier eyepiece, then take the BHN from a tarrage table.
Lyman #2 - Cast Bullet Forum
2013年2月10日 · The 5% tin and 5% antimony with 90% lead in Lyman #2 has been the most popular hunting alloy for cast bullet shooters for well over 100 years because it has a very optimized mix of hardness and ductility for bullets that only need 1,000 foot pounds impact on game animals for double caliber expansion and 100% weight retention of bullets as they ...
Alloy hardness for BPCR vs. accuracy - Cast Bullet Forum
2009年1月28日 · Lead alloys do not react like steel. Water quenched alloys containing arsenic harden initially, but do loose there hardness over time. There's several posts on this forum with folk's actual measurements. The Lyman Cast Bullet Handbook states that it occurs after 2 years, but I believe it's dependant on the amount of arsenic and tin in the alloy.