Case length and COL
Posted 18 May 2011 - 05:39 PM
Posted 18 May 2011 - 06:03 PM
Posted 18 May 2011 - 06:52 PM
Yes and yes. Yes, that way will work, BUT yes, there is a much better way. http://www.midwayusa...ctNumber=231904http://www.midwayusa...ctNumber=570611Hornady (and I'm sure other manufacturers) actually make tools just for checking your overall length. I myself do not use the modified case and tool designed to push a particular bullet into the lands to be measured. I make a dummy case myself (I can be so cheap sometimes) by removing part of the neck to allow the bullet in question to slide back easily when the bolt is closed. You do this several times and you will have an excellent "base" measurement. Then I usually subtract about .010 since I hunt and want to make sure they function. I do however love the caliber specific collet tool that clamps onto your micrometer to measure the bullet at the olgive and not the tip where it may be deformed. It may sound kind of different reading about these tools, but when you look at them, you will see how very simply they work.
I’m reloading for my bolt action .223Rem rifle, I trim the case to 1.76” according the reloading manual and set the COL as long as possible that the bolt can close normally. I can now get sub 1” group at 100 yard. Am I doing the right way? Is there a better/accurate way to figure out the “correct” case length and COL for the gun I’m reloading for? Or is this something even worth worrying about?
Posted 19 May 2011 - 06:42 AM
Posted 19 May 2011 - 06:50 AM
Yates, sometimes you have to be careful with that method, especially is used for hunting. If you have a round in the chamber and decide to unload the gun, the bullet can actually get stuck in the lands & come completely apart, spilling powder everywhere. And if a long ways from the truck, you are done hunting. Not that has ever happened to me before. There are several methods of arriving at COL, and NONE seem to bring EXACT measurements for me. The Stoney Point tool comes close, which is what I use, but requires the patience of Job(e). It too is a pain in the a_ _, as you have to take r e p e a t e d measurements to get almost close. Of course if one does this about one bazillion times, the better one will get at it... and if one has L-O-T-S of time on their hands. Some will put a bullet in an unloaded, already fired brass and close the bolt. This is a very inconsistent & unreliable method IMO. As mentioned above, making sure the rounds FIT in the magazine is important and can be easily missed. Folks will be so intent on getting that max COL & then go to the range without checking if they fit in the magazine, which sometimes the rounds will not. A big problem if using that rig for hunting of course. Another possibility, is to compare your longest loaded rounds (at the range) to an industry standard COL round, found in the loading manuals. Sometimes the longer rounds are no more accurate. The "book" COL can be a good starting point in other words, especially for the lighter bullets in any given caliber. Frank
and set the COL as long as possible that the bolt can close normally.
Posted 19 May 2011 - 06:51 AM
Posted 19 May 2011 - 07:51 AM
Posted 19 May 2011 - 11:37 AM
Posted 14 October 2011 - 11:01 AM
Posted 14 October 2011 - 03:13 PM
Posted 16 October 2011 - 06:42 AM
Frank, Thanks for clarifying that.Leonten, Don't get confused between case length and Cartridge overall length. That'll drive you nuts. Welcome to the forum brother.
Leonten, that is not what Fox had said. May want to re-read the posts above.COAL = Cartridge Over All Length.... NOT just the "case" length.
Posted 16 October 2011 - 10:20 AM
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