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Posted: 1/19/2013 9:13:00 AM EDT
| Measure new manufactured Federal XM193 and the c.o.l. is 2.186-2.198 none were 2.200, is this normal? I used one to set up seating die and made a handful of rounds that are slightly under 2.200 they were all once fire brass trimmed to 1.75 and were loaded with 23.5 gr of benchmark and with Hornady 55gr sp flatbase, any guidance on this would be appreciated. |
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Quoted:
Measure new manufactured Federal XM193 and the c.o.l. is 2.186-2.198 none were 2.200, is this normal? I used one to set up seating die and made a handful of rounds that are slightly under 2.200 they were all once fire brass trimmed to 1.75 and were loaded with 23.5 gr of benchmark and with Hornady 55gr sp flatbase, any guidance on this would be appreciated. C.O.A.L. will never be balls-on consistent. Bullets are seated by the Ogive, not the tip. The tip will always vary slightly due to the manufacturing process. This is done so the INTERNAL VOLUME is consistent. External dimensions are somewhat secondary in importance(unless you have a very tight tolerance chamber) Hope this helps. 
ETA: go ahead and measure the length of a few bullets, and I am willing to bet there will be a few thousandths of a difference between them. |
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