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Old April 29, 2011, 03:12 PM   #24
Berry's MfG
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Join Date: June 7, 2010
Location: St. George, UT
Posts: 122
Great point on the crimp. The nature of the beast is that the plating is not as hard as a jacket, the plating is thinner and is not work hardened like a drawn and formed jacket. There is a mis-conception that the leas we swage is softer than in a jacket, but that is usually the opposite. We find that by adding 3% antimony and a percentage of tin create a better substrate for the copper to adhere to. Most jackets use close to pure lead because it is cheaper. Tin and antimony are both over $7.00 per pound where lead is being traded around $1.17 a pound. By using the same crimp pressure on a jacketed vs. a plated you will probably create a waistline, where the mouth is crimped in and the material is non-compressible and usually goes below the crimp. You can pull a seated and crimped bullet to see if the crimp has damaged the bullet. This is the number one cause of inaccuracy in our bullets. As far as the FP bullets, I find that the design (more like an XTP) lends itself to being seated in deeper than a RN. The ogive of the FP is compact and needs to be seated in deeper to give the proper jump distance to the lands and grooves (that is the prevailing theory).
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Jay R. Phillips
Berry's MFG
www.berrysmfg.com/products.aspx?n=57958
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