Colvis Posted July 20, 2006 Share Posted July 20, 2006 I'm shooting .38 Super (not Super Comp), what does the term "Rimless" mean? Sorry for the ignorant question. Link to comment Share on other sites More sharing options...
AikiDale Posted July 20, 2006 Share Posted July 20, 2006 It means the base, rim, of the cartridge is slightly smaller in diameter. Link to comment Share on other sites More sharing options...
Guy Neill Posted July 20, 2006 Share Posted July 20, 2006 Rimless means the rim diameter is no larger than the case diameter. Normal Super cases are "semi-rimmed" where the rim diameter is larger than the case body, but not as large, propotionally, as the rim diameter on a rimmed case compared to the case body diameter, such as a 38 Special. The rimless is seen as an advantage in autoloading guns since the is no possibility of hte rims (or semi-rims) getting stacked up the wrong way and causing a problem. Guy Link to comment Share on other sites More sharing options...
Colvis Posted July 20, 2006 Author Share Posted July 20, 2006 So do you need to adjust your extracter like you do to shoot Super Comp. Or since it's "Rimless" but not "Super Comp" you don't have to tune the extractor? What do most .38 super Open shooters uses (not counting super comp) rimless or just normal?? Link to comment Share on other sites More sharing options...
AikiDale Posted July 20, 2006 Share Posted July 20, 2006 The Super Comp is a rimless cartridge. The extractor for 38 super comp and rimless is the same. Link to comment Share on other sites More sharing options...
Colvis Posted July 20, 2006 Author Share Posted July 20, 2006 The Super Comp is a rimless cartridge. The extractor for 38 super comp and rimless is the same. Thanks Dale! Super Comp IS Rimless... That's what I was trying to figure out. Link to comment Share on other sites More sharing options...
ipscbob Posted July 24, 2006 Share Posted July 24, 2006 Is this Armscorp? Ideally the extractor should be slightly shorter for AP brass than starline supercomp. Link to comment Share on other sites More sharing options...
blackdragon Posted July 24, 2006 Share Posted July 24, 2006 Our brass is +- the same as " Super Comp" Ivan Link to comment Share on other sites More sharing options...
Jon Merricks Posted July 25, 2006 Share Posted July 25, 2006 Colvis, Rimless, Super Comp and TJ all pretty much have the same rim. There are some guns out there that can run just fine with both. Try it with the rimless and see if it works. If your gun leaves the rimless in the chamber that means it doesnt. Link to comment Share on other sites More sharing options...
ipscbob Posted July 25, 2006 Share Posted July 25, 2006 blackdragon, sorry to disagree but.....+- what? My experience is that the groove above the rim on AP brass is slightly different than supercomp. The front shoulder appears to be slightly farther back and hits the nose of an un modified EGW or Brown extractor which leaves a gouge in the brass. If left unmodified, I find that extractors fatigue and fail early do to working from this interference. There are also slight differences in rim thickness and primer pocket dimensions that cause the APs to intermittently hang up in my 550B while priming. The cost difference between AP and starline supercomp is negligable so I use starline exclusively. Link to comment Share on other sites More sharing options...
shred Posted July 25, 2006 Share Posted July 25, 2006 I have noticed that Starline Supercomp has been slowly turning into more of a TJ-like case-- the extractor cut has enlarged and moved forward over the years, so it may depend on what vintage you're comparing to. Now if only we could get Lapua to shape up. Link to comment Share on other sites More sharing options...
ipscbob Posted July 25, 2006 Share Posted July 25, 2006 I have noticed that Starline Supercomp has been slowly turning into more of a TJ-like case-- the extractor cut has enlarged and moved forward over the years, so it may depend on what vintage you're comparing to.Now if only we could get Lapua to shape up. How is the pricing and availability on Lapua? Since all of our open guns are optimized for starline, I stick with it but I hate to be single sourced. Link to comment Share on other sites More sharing options...
blackdragon Posted July 25, 2006 Share Posted July 25, 2006 ipscbob, +- is that!, 220-221, More or less, Kinda sorta, Close enough for handgrenades....... Ivan Link to comment Share on other sites More sharing options...
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