Armory Sponsor
Posted: 1/17/2013 6:50:56 PM EDT
| What method are you fellows using to measure/find the length from the case base to the bullet ogive on your ARs. In my bolts I use a half spit neck on one side and chamber the case with a slightly started bullet closing the bolt. I the use the Hornady tool to measure after gently pulling the case and bullet out. Will the same work on the ARs? |
| Yes it will work with your method on an AR. I had better luck by breaking the lower from the upper and to push the bolt forward by hand rather than letting the spring push the bolt. Snap the split necked case under the extractor and hold it straight when pushing it into the chamber. The ejector spring is pretty stiff. It will get you a measurement that's pretty close. It'd be ideal to remove the ejector and spring but don't think it's really necessary. Only need to measure for long match 75 A-Max, 80 and 90 grain match bullets as the throat is so long that other bullets won't get close. The magazine maximum length at 2.260" is all that you can do. Take two or three measurements to insure you're getting a consistent reading with your Hornady tool. |
|
Quoted:
Yes it will work, but. If your AR is a 5.56 then there is little point as the throat is long and the mag is only 2.260. I load to fit the mag and ignore the jump. Yep. For the AR it's usually the magazine that dictate the COAL. I have a mag that is only around 2.250" so I load all my ammo for that rifle at 2.235". I have measured the bullet jump for bullets up to the 69gr Sierra BTHP and still the mag is the limiting factor and my rifle is a .223 not a 5.56. I don't know about the heavier, longer bullets. Maybe somebody who loads them will chime in with some numbers. I know every rifle is different but at least it will be somewhat informative. |
Armory Sponsor