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Posted: 1/3/2009 1:52:13 PM EDT
i am using LC brass trimmed ,full length sized,CCI #41 primers hornady 55 grn FMJBT and 24 grains of AA2230 powder.it seems to me they area little sooty . i would like some opinions please .personally i think i need to kick them up a notch but they are so damn accurate . i had to change them. if i leave them could there be any issues it cycles fine no short stroking . and try to give me 1 good answer for every 10 BS answers thanks
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and try to give me 1 good answer for every 10 BS answers thanks http://i555.photobucket.com/albums/jj479/charlesPOSTLEwade/007.jpg Why not try a few more increments of the powder you are using now? Keith_J gave you the answer, but he's a known bullshitter. 
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Low pressure loads will mean your cases will last longer. If the load has the accuracy and velocity for the range at which you are shooting, then low pressure loads will not hurt anything. They do make cases and your chamber a bit more dirty, but that is the only problem low pressure loads create, providing that the action cycles correctly.
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and try to give me 1 good answer for every 10 BS answers thanks http://i555.photobucket.com/albums/jj479/charlesPOSTLEwade/007.jpg Why not try a few more increments of the powder you are using now? Keith_J gave you the answer, but he's a known bullshitter. [>:/] Tell you what...try this instead of messing with the charge....clean the necks of the cases, INSIDE. Use a bore brush spinning at about 500 RPM or so. Make them shine and remove the dust etc. Well, better not get them TOO clean as the bullets can gall on the case, dramatically increasing the bullet pull. Brushing or any mechanical cleaning is fine. Chemically cleaning, then coating with rosin would be a bad idea. Here is what happens after the primer ignites. 1. The case is showed forward by the force of the firing pin. Since we need clearance, this is 1-3 thousandths of an inch. The primer backs out. 2. The pressure rises in the case. Barlow's Equation dictates what part of the case expands first and that is always the body of the case, right behind the shoulder. Here, the case is somewhat annealed and of the greatest diameter with thinnest wall. 3. The bullet starts moving. Here is where the neck soot happens. Since the neck is smaller diameter, if the bullet moves and enters the throat, clearing the neck BEFORE the pressure required to expand the neck is reached, soot will leak back and the neck can never expand as the pressure is equal on the outside and inside of the neck. 4. Now the case pressure is over ~28,000 PSI. The case is sealed in the chamber and the pressure now can stretch the lower part of the case, near the web so that the case head is against the bolt face. The primer is now shoved back into the case. What are the pressures? For .223 Rem, the OD of the neck is around 0.250" so twice the neck thickness is 0.0260". The yield point of 1/4 hard brass is about 20,000 PSI and so using stress equal to Pressure * ID/2t, that pressure is about 2320 PSI. Very low. That is about a bullet pull of 90 pounds of force. |
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Those cases look fine. If the soot was farther down the case body I would be inclined to thing the pressure was running too low. If the load shoots, I don't see any reason to change. Shall I lock the thread after 10 posts to make locating the bullshit simpler? I would think after me would be lockable for BS. ETA: Or an easy lock would be when somebody demands a no-BS answer. All you get here are opinions based on experience, and if you are not smart enough to hit all the usual sources first, you deserve to have someone tell you something dumb. You are already posting on an internet forum, and if you are smart enough to do that, you are smart enough to find the data from the people who made the parts you are putting together. |
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and try to give me 1 good answer for every 10 BS answers thanks http://i555.photobucket.com/albums/jj479/charlesPOSTLEwade/007.jpg Why not try a few more increments of the powder you are using now? Keith_J gave you the answer, but he's a known bullshitter. [>:/] Tell you what...try this instead of messing with the charge....clean the necks of the cases, INSIDE. Use a bore brush spinning at about 500 RPM or so. Make them shine and remove the dust etc. Well, better not get them TOO clean as the bullets can gall on the case, dramatically increasing the bullet pull. Brushing or any mechanical cleaning is fine. Chemically cleaning, then coating with rosin would be a bad idea. Here is what happens after the primer ignites. 1. The case is showed forward by the force of the firing pin. Since we need clearance, this is 1-3 thousandths of an inch. The primer backs out. 2. The pressure rises in the case. Barlow's Equation dictates what part of the case expands first and that is always the body of the case, right behind the shoulder. Here, the case is somewhat annealed and of the greatest diameter with thinnest wall. 3. The bullet starts moving. Here is where the neck soot happens. Since the neck is smaller diameter, if the bullet moves and enters the throat, clearing the neck BEFORE the pressure required to expand the neck is reached, soot will leak back and the neck can never expand as the pressure is equal on the outside and inside of the neck. 4. Now the case pressure is over ~28,000 PSI. The case is sealed in the chamber and the pressure now can stretch the lower part of the case, near the web so that the case head is against the bolt face. The primer is now shoved back into the case. What are the pressures? For .223 Rem, the OD of the neck is around 0.250" so twice the neck thickness is 0.0260". The yield point of 1/4 hard brass is about 20,000 PSI and so using stress equal to Pressure * ID/2t, that pressure is about 2320 PSI. Very low. That is about a bullet pull of 90 pounds of force. I need some letters behind my name to understand this. In other words, way above my pay grade. But an excellent explanation Keith_J |
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