Modified Cases for OAL gauge

[Wolfdog91]

Ok so quick question here. For those who use the Hornady Over all length gauge with the modified Cases . Just how much difference do y'all see when using the store bought modified Cases vs ones made with fire formed brass for that particular rifle ? Like I've had people say the fired formed ones are better but haven't talked to anyone who's actually done a comparison. Also curious because I don't have a lathe to make my own so kinda stuck with the store bought ones. Just curious to see how much I could be missing I guess
Thanks

 

[WSnyder]

Just how much difference do y'all see when using the store bought modified Cases vs ones made with fire formed brass for that particular rifle ?

Well that all depends on how the rifle was chambered headspace wise. No way to know till you check. Could be on the short end and close to go gage or could be a bit longer or a lot longer.

 

[JFrank]

Ok so quick question here. For those who use the Hornady Over all length gauge with the modified Cases . Just how much difference do y'all see when using the store bought modified Cases vs ones made with fire formed brass for that particular rifle ? Like I've had people say the fired formed ones are better but haven't talked to anyone who's actually done a comparison. Also curious because I don't have a lathe to make my own so kinda stuck with the store bought ones. Just curious to see how much I could be missing I guess
Thanks

The only reason to use a fire formed case is to match the shoulder angle of the case to your chamber, most store bought modified cases will be close enough to get the job done. Headspace doesn’t matter because your not closing the bolt while using the L&L tool.

 

[jrb06]

As long as you always use the same case it should be consistence. The tool is a comparator and will give you a value, once you find the value to the lands and best on target you now have your set point. It really doesn't matter if you find .003 off lands shoots best measured by your gauge but it may really be .005 with a fired gauge to the lands the main point in keeping things the same every time your reload and measure.

 

[dellet]

If you’re using the tool to find base to ogive distance it can off as much as .020”.

Simply measure base to shoulder of your fired brass and compare that to base to shoulder measurement of the modified cases you are using. Sounds like you have more than one you can try.

 

[SeabeeKen]

Fireformed every time. I make a new one each time I replace barrels also

 

[Bottom Fodder]

Same modified brass on third same caliber barrel.

 

[Wolfdog91]

The only reason to use a fire formed case is to match the shoulder angle of the case to your chamber, most store bought modified cases will be close enough to get the job done. Headspace doesn’t matter because your not closing the bolt while using the L&L tool.

As long as you always use the same case it should be consistence. The tool is a comparator and will give you a value, once you find the value to the lands and best on target you now have your set point. It really doesn't matter if you find .003 off lands shoots best measured by your gauge but it may really be .005 with a fired gauge to the lands the main point in keeping things the same every time your reload and measure.

Ok that's what I was wondering..to me it didn't make a ton sense that a generic case wouldn't work just fine to just find the lands . Though I'm not the most educated on how shoulder bump can effect CBTO. That being said if a guy don't have a lathe or drill press how would y'all go about making cases ? I tired years back with a hand drill and it was just a miserable failure lol ...then again I was a lot younger and way more impatient so maybe it's time to retry ?