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- From: burge@qdeck.com (Bill Burge)
- Newsgroups: rec.guns
- Subject: Re: Quick reloading question (bullets)
- Message-ID: <9301201203.aa00703@sco1.qdeck.com>
- Date: 23 Jan 93 15:59:38 GMT
- Sender: magnum@mimsy.umd.edu
- Organization: Quarterdeck Office Systems, Santa Monica CA
- Lines: 48
- Approved: gun-control@cs.umd.edu
-
- In article <1993Jan19.173334.23145@galileo.cc.rochester.edu> kkrh@troi.cc.rochester.edu (K. Karcich) writes:
- #In <C139vJ.58z@constellation.ecn.uoknor.edu> callison@kittyhawk.ecn.uoknor.edu (James P. Callison) writes:
- #
- ##Another newbie reloading question....
- #
- ##I got some 240gr. SWCBB cast lead bullets, and I have two questions about
- ##them.
- ##First, what does SWCBB stand for? I figured out Semi-Wad-Cutter, but what's
- ##the BB for? I suppose it doesn't stand for Ballistic Ball :-)
- ##Second: they all have two grooves; the top groove's top edge is about 1mm
- ##(maybe less; it's just a guesstimate) deep, and the groove itself angles
- ##up from there to end up flush with the surface. The bottom groove is lower
- ##down and about twice as deep as the upper groove.
- ## __
- ## / \
- ## _/ \_
- ## |_ _|
- ## / \ <-- top groove
- ## | |
- ## |_ _|
- ## _| |_ <-- bottom groove
- ## | |
- ## \______/
- #
- ## FIG 1. Crude-ASCII graphic of 240gr. SWCBB bullet
- #
- ##(Sorry I don't know the technical terms for these things; "thingies" didn't
- ##seem quite appropriate :-)
- #
- ##Anyhow, the second groove is filled with a wax-like purple substance. I
- ##assume that this is left over from the casting process, but what I want
- ##to know is if I should clean it out, or should I just not worry about it
- ##(or should I definitely leave it alone)?
- #
- #Jim,
- #
- # The top groove is for crimping the case and the bottom groove is a
- #lube groove. Leave the lube in the groove. Also, from your picture, it appears
- #that this bullet may be designed for a gas check. This is a little guilding
- #metal cup which can be crimped on the bullet base, which protects the base and
- #permits heavier loads and higher velocitys without leading.
- #
-
-
- That's the bevel base.
-
- Bill burge@qdeck.com
-
-