I have had similar problems with a 243 lever action. Also use the wilson's gauges.
Ended up screwing the die down to ensure that it bottoms out against the shell holder.
Have to full length resize every time.
Started with a held held unit, then got a "C" press and ended up breaking it. Since I changed to a proper press my problems have reduced.
Have to trim my brass every time.
You can get shell holders that are a little thinner so the case sits deeper into the die.
I also find that I have to watch for the case stretching just up from the head where the case thins out inside.
Use a set of picks to check the inside everytime.
Also don't push too many reloads out of my brass.
Had a case head separation (Luckily with trail boss load)
Zq
ps. Have another lever action for a 308 family cartridge and after 4 reloads I still have not had to trim my brass. Some cases require just a touch on the shoulder but others just need a neck resize. My lever actions I keep 1-2gr under book max recommend loads. Work up a test load to close to book max to ensure I have room for temp variations etc but these are not long range rifles so I don't need to run them hard.




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