fille9 Posted August 13, 2017 Report Share Posted August 13, 2017 How can I find the case length in order to have the point of the bullet just touching the groves in the barrel? I guess once you get the proper case length then I have to find the proper depth to seat the bullet. How do I find the proper depth to seat the bullet?? Rifle in question is Springfield M1A cal 308. Is there any difference between Cal 308 and &.7.62 Thank you in advance......Phil M. Link to comment Share on other sites More sharing options...
lichum Posted August 13, 2017 Report Share Posted August 13, 2017 1 hour ago, fille9 said: How can I find the case length in order to have the point of the bullet just touching the groves in the barrel? I guess once you get the proper case length then I have to find the proper depth to seat the bullet. How do I find the proper depth to seat the bullet?? Rifle in question is Springfield M1A cal 308. Is there any difference between Cal 308 and &.7.62 Thank you in advance......Phil M. Case length is ONE of the factors that determines Cartridge Overall Length (COL). The other two factors that determine COL are bullet length and bullet seating depth. To have the bullet just touching the lands you must determine the Cartridge Overall Length (COL) that will do that in YOUR M1A. My impression is that your are a novice reloader so be aware that in general, pressure rises when a cartridge has a COL such that its bullet just touches the lands (minimal bullet jump). The www is loaded (bad pun) with info on reloading cartridges for the M1A. "Who is John Galt?" Who? You? Link to comment Share on other sites More sharing options...
fishweewee Posted August 14, 2017 Report Share Posted August 14, 2017 (edited) Case length (CL) refers to the length of the empty brass case from the base of the case to the case mouth. When a case gets fired, it stretches and so it needs to be trimmed back to specified length before reloading. The case length info (in inches) can be obtained from a good reloading manual or SAAMI: http://saami.org/specifications_and_information/index.cfm?page=ANSI Cartridge overall length (COL) refers to the length of the entire loaded cartridge, from the base of the brass to the tip of the bullet. These will vary somewhat even within calibers. Frequently referred to as max COL - the longest case length that can be loaded so that it chambers, or fits in your magazine (if applicable). What COL is right for your rifle? You can customize it using a overall length gauge like this one in the vid below. Remember the shorter the COL, the higher the pressure. Stick to the published specs in the reloading manual that is consistent with the powder and bullet/bullet weight that you are using. Hornady has two different models - one for bolt guns and one for gas guns. Edited August 14, 2017 by fishweewee Link to comment Share on other sites More sharing options...
fishweewee Posted August 14, 2017 Report Share Posted August 14, 2017 (edited) Obviously, you would be well served with a quality calipers. I'm partial to Starrett or Mitutoyo. There are also some decent digital ones out there. The bestest value in case trimming tools out there is the Giraud: http://www.giraudtool.com/Tri Way Trimmer.htm Remember that you need to tumble and resize cases before trimming them. Don't forget to get a case gauge from LE Wilson. Edited August 14, 2017 by fishweewee Link to comment Share on other sites More sharing options...
fishweewee Posted August 14, 2017 Report Share Posted August 14, 2017 How well are you resizing your brass to spec? Want to find out? Here is your tool: https://www.midwayusa.com/product/1012938464/rcbs-precision-mic-308-winchester Link to comment Share on other sites More sharing options...
Hirocks 286 Posted October 6, 2017 Report Share Posted October 6, 2017 Sinclair Intl. also Brownells. is loaded with products. Their famed for accuracy enhancing products. They will have a few COL gauges and tools to get there. Link to comment Share on other sites More sharing options...
george6308 Posted October 6, 2017 Report Share Posted October 6, 2017 (edited) All of the manufactures of reloading tools make case trimmers. Lee's being the simplest. Edited October 6, 2017 by george6308 Link to comment Share on other sites More sharing options...
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