newshooter Posted August 28, 2006 Share Posted August 28, 2006 How do you check in how much crimp you are putting on your bullets when made??? do yo all use a mic or some other measuring tool? When i read the board looking at peoples different powder usage oal and then i see crimp like .420 or .006 or something of that nature how do they get these numbers. just curious once again joey Link to comment Share on other sites More sharing options...
Sean Gaines Posted August 28, 2006 Share Posted August 28, 2006 just use some calipers to measure the crimp. Link to comment Share on other sites More sharing options...
newshooter Posted August 28, 2006 Author Share Posted August 28, 2006 just use some calipers to measure the crimp. You just measure at the edge of the case?? where you see it rolled over??? Link to comment Share on other sites More sharing options...
Sean Gaines Posted August 29, 2006 Share Posted August 29, 2006 thats what I do. As far as Overal length. Measure from the top of the bullet to the bottom of the case were the primer is. Pretty simple. Link to comment Share on other sites More sharing options...
HSMITH Posted August 29, 2006 Share Posted August 29, 2006 If it is rolled over you are doing it wrong. "Taper crimp" used in autoloader cartridges is a misnomer, it isn't actually a crimp. It is a method of pressing the cartridge brass back against the bullet and that is all. .420" would be a maximum 'crimp' you should ever see, something around .422" is about what you should look for right at the mouth of the case. Crimping any more than about .420" will be detrimental, it will lower case tension and make accuracy harder to find. Case tension is all that prevents setback of the bullet, setback of the bullet on feeding is the cause of nearly all 40 blow-ups. Link to comment Share on other sites More sharing options...
newshooter Posted August 29, 2006 Author Share Posted August 29, 2006 Hello thanks for sharing on how to find out how much crimp I am putting into my rounds. I have never thought or heard about checking it until I started reading this board. I would just look at it and use my judgment to keep the way it is or put more or less crimp. Thanks again for explaining how to check the crimp Joey Link to comment Share on other sites More sharing options...
Chris Keen Posted August 29, 2006 Share Posted August 29, 2006 Reloading is VERY DANGEROUS when done without measuring instruments, such as a caliper & powder scale. Your eyes are not an accurate measuring instrument. VERY DANGEROUS INDEED. Link to comment Share on other sites More sharing options...
newshooter Posted August 29, 2006 Author Share Posted August 29, 2006 Reloading is VERY DANGEROUS when done without measuring instruments, such as a caliper & powder scale. Your eyes are not an accurate measuring instrument.VERY DANGEROUS INDEED. i have all the equipment for relaoding and use it all. i just never checked the crimp by measurement. i would pull the bullet and check to see if it cut threw the plated rainier bullets. since they are a soft coat. Link to comment Share on other sites More sharing options...
Flexmoney Posted August 30, 2006 Share Posted August 30, 2006 Hmmm...I wonder if any of this is coverd in a reloading manual??? Link to comment Share on other sites More sharing options...
blackdragon Posted August 30, 2006 Share Posted August 30, 2006 We will soon find out! ( Or you will). Ivan Link to comment Share on other sites More sharing options...
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