Do straight wall rifle cases have to be trim?

Do you have to trim straight wall rifle cases like bottle neck cases?  Is their and AR plant form that uses straight wall cases that don’t have to be trim.

3 Answers

  • 1 month ago
    Favorite Answer

    Yes.  You will always need to trim a case if it exceeds the case length specifications - bottle neck or straight wall.  Straight wall do not mind being shorter - just not longer.

      As a handloader, reloader, there are things you can do that will make your cases stretch less.  Easiest thing is to go to target loads instead of full power loads.  Second is to get a 'case prep kit' - look for one that has powered mica - you dip the case mouth in the mica, use the bench mounted brush to clean and spread the mica, then do the full length size.  Sometimes I will spread a little bit of case lube into the mouth of a piece of brass.  Both of these will help prevent the case mouth getting stretched when the expander is pulled through.

    AR is a semi-auto firearm with a bottle neck cartridge - bottle necks 'headspace' on the case shoulder.  Straight wall cases are usually found in revolvers and lever action rifles - they headspace on the base.  There are only a small handful of guns that are semi-auto and use straight wall cases - Desert Eagle being the most popular.  

  • Robin
    Lv 7
    1 month ago

    you have to trim ALL cases

  • 1 month ago

    Yes.  As you resize the brass it stretches so you have to trim it now and then.   For accuracy you check case length each time. 

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