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Posted: 7/30/2008 4:57:21 PM EDT
| Would someone explain fire forming brass? I made what i thought to be "nice match loads", with brand new Lapua brass trimmed to 2.005, SMK 168 grain BTHP, Fed 210M primers, 2.810 OAL, and a load worked up from 41-42.5 grains of varget. The best load was 41.5 grains at around an inch with a five shot group out of my Rem 700 pss. I wasn't really happy with the groupings. Does "fireforming" the brass mean it should be more accurate the next time fired from the same gun? Thanks for you help. |
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Well. . .generally fireforming is a forming operation done for calibers which require a final forming such as blowing out the shoulder which cannot be done with a die alone. That said, in your case, if you are sizing properly, the second firing should fit the chamber better and be more accurate. This does require some planning so you don't just resize the case back to an excessively small dimension. |
Just for future reference, a lot of Lapua shooters just load it up out of the box, assuming you don't have dinged in case mouths and shoot it. It's so close tolerance wise, that you don't need to FL size it. After that first fire forming to YOUR chamber, you can do the prep work as you see fit and as needed. Chris |
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