45 GAP

teeslick

January 15, 2006 10:38

I'm looking at getting an XD-45 GAP, Can i use the dies from a 45 ACP to reload GAP? Anyone know the best place to get brass(new or once fired) for GAP? Can an ACP case be trimmed down to work in a 45 GAP?

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  nononsense

  January 15, 2006 11:13

  teeslick,
  
  According to Speer, it is unsafe to cut down 45 ACP cases to use for the 45 GAP cartridges due to the rebated rim, stronger case design and small primer pockets on the GAP brass. GAP cartridge brass operates at a higher pressure than the 45 ACP.
  
  Brass is available from Starline.
  
  "The internal case wall profile is significantly different from .45 Auto cases to permit seating .45-caliber bullets without bulging. The most obvious difference is that the .45 GAP uses a Small Pistol primer to put distance between the primer and breech/action elements present in 9mm-frame pistols. It is unsafe to cut off .45 Auto cases to make .45 GAP cases. The most significant issue is the difference in primer size. A Large Pistol primer that fits the .45 Auto case will over-ignite safe powder charges developed in proper GAP cases with small primers, and high pressure will result. The .45 GAP case has a much different internal taper, so cutoff .45 Auto cases will bulge when bullets are seated to recommended lengths."
  http://www.shootingtimes.com/ammunition/new_45/
  
  
  
  "Being 3-mm shorter than the case of the .45 ACP, that of the .45 GAP is otherwise identical on the outside except for two things: It uses a small pistol primer instead of a large one, and it is a rebated rimless case. The rim of the .45 GAP is 0.470" in diameter (samples measure .467") as compared with 0.475" for the .45 ACP. This was done to prevent shortening the .45 ACP case and reloading it to shoot in a .45 GAP pistol. Glock strongly recommends against shooting any reloaded ammunition in its pistols, especially with lead bullets. In addition, the internal dimensions and composition of the .45 GAP case are slightly different from the .45 ACP."
  http://www.military.com/soldiertech/0,14632,Soldiertech_Glock37,,00.html
  
  
  http://mywebpages.comcast.net/petej/45gap.defend.htm
  
  http://www.miragetechnologies.net/45_gap_technical_brief.htm
  
  Reloading Article:
  
  http://www.findarticles.com/p/articles/mi_m0BQY/is_5_51/ai_n13469649
  
  Best.

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  skeet47

  January 21, 2006 05:44

  Used GAP brass can be purchased from G&G
  gekgun@yahoo.com

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