I now use a different method of finding jam, take a fired case and paint some loctite on the end of the projectile that goes in the case mouth, put the projectile in the case mouth making sure to leave it longer than your freebore.
Chamber the round carefully closing the bolt then leave it for 30 minutes to let the loctite set.
Carefully eject the loctite round and measure it for your jam measurement.
Works well and once you have your jam you can soak the round in hot water to release the loctited projectile.
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