Besides shooting a 6.5cm, what am I doing wrong. RCBS sizing die. Hornady paste sizing lube. Both pieces shot out of the same rifle. Both sized at the same time. .050" difference.
Case sizing.
- Thread starter Jscb1b
- Start date
How bout some more details? Like all of them.
Guessing overall case length? Seeing the pictures, I'd screw in the sizing die a quarter turn and try again.
There are typically 2 measurements of interest in this instance. The first is the datum dimension that is the base of the case to the shoulder being too long. The other is the case diameter 0.2" above the case base. In some rare cases the problem can be the case body diameter at the shoulder but that is extremely rare.
You will also need to make sure that there are no burrs on the case rim. This isn't often a problem but can sometimes occur with semi autos or a bad extractor in a bolt gun.
You will also need to make sure that there are no burrs on the case rim. This isn't often a problem but can sometimes occur with semi autos or a bad extractor in a bolt gun.
One of the downsides to those plunk gauges is if you have a case rim anomaly, the case will not plunk all of the way down into the gauge, giving you a false reading.
I've had this happen often, especially cases fired in a gas gun.
No way you're getting .050" difference. Try a different piece of brass.
Years ago, I moved from the plunk gauges to a better datum measuring tool like the Hornady comparator tool. There are several of these type comparators available. My favorite is currently the Derraco tool.
The other tool that measures the datum well is the RCBS precision mic and the Whidden case gauge, both of these gauges are cartridge specific, so it's a little pricey for one cartridge.
The Hornady type of comparator tool works for dozens of cartridges. A caution with this type tool is to decap the brass you're going to measure because primer cratering can give you false readings.
I've had this happen often, especially cases fired in a gas gun.
No way you're getting .050" difference. Try a different piece of brass.
Years ago, I moved from the plunk gauges to a better datum measuring tool like the Hornady comparator tool. There are several of these type comparators available. My favorite is currently the Derraco tool.
The other tool that measures the datum well is the RCBS precision mic and the Whidden case gauge, both of these gauges are cartridge specific, so it's a little pricey for one cartridge.
The Hornady type of comparator tool works for dozens of cartridges. A caution with this type tool is to decap the brass you're going to measure because primer cratering can give you false readings.
Hey, don't mess with my 'plunk" gauge! Actually it is a good QC item when loading for a Semi Automatic because if it doesn't pass the the plunk test it may well become a stuck cartridge in the gun which makes for a bad day. That's especially true if you try the forward assist! 
