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Old April 29, 2011, 03:12 PM   #24
Berry's MfG
Senior Member
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).
Jay R. Phillips
Berry's MFG
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