Caliber Question

SP45

April 23, 2003 16:55

How does the 5.45x39 as a general purpose and defense round compare to the 5.56. My principal concerne would be a defensive round. I understand that this round was designed as a military caliber, but would like to know if it has applications for varmint use as well. I see that S&W is fielding a M&P Ar style rifle in this caliber, and was curious as to it's comparison overall to the 5.56. I know that this is a vague question, I apologize, but any information on this caliber would be appreciated (ie): strengths and weaknesses, accuracy, stopping power and effective ranges.

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  SP45

  April 23, 2003 16:55

  Might someone please tell me the differences between 45.70(govt) and 45.75?
  
  Will 45.70 safely chamber and fire in a rifle that is chambered for 45.75?
  
  I have always understood that the 70-75 numbers signify the weight in grains of the powder charge in the cartridge.
  
  Thanks much.
  
  FLc

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  Python

  April 23, 2003 23:25

  SP45;
  If memory serves, these rifles were built on the Martini
  action. They were offered, if this is the same rifle, in basically
  every caliber known to man, from .22 rimfire to .375H&H mag. The only way, in absense of the caliber stamp, will be to have the chamber cast and the calibration determined by a gunsmith. It could be one of many in the .38 caliber family, including the .38-40 winchester.

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