New to reloading. I bought a Redding Instant Indicator to help set my sizing die. Using the brass guage that Redding supplies, I zeroed the indicator. I then ran 50 once fired cases from a Remington 700 (.308) and 50 once fired cases from a Sako TRG 22 through the indicator. All of the Remington 700 brass measured .001-.003 above SAAMI minimum. All of the Sako brass measured .001-.003 below SAAMI minimum.
The Redding instructions provide the following: "to get a true reading of your chamber, use cases that have been minimally resized (or neck sized only) and fired at least 2 or 3 times. The first firing of commercial ammunition and/or new brass may provide a fired case that is not yet fully formed to represent the datum length of your chamber. With the first firing of new ammunition or cases, you may even encounter a minus dial reading. This indicates that your chamber is at or near the SAAMI minimum dimension and that the first firing of the brass has not yet fully formed it to represent your true chamber length."
The instructions provide the typical advice to set a sizing die to bump the shoulder back .002-.003. However, the instructions do not say whether you should do anything differently for brass that reads below the SAAMI minimum or on once fired brass generally.
Given my readings, how would you approach setting a full-length sizing die?
The Redding instructions provide the following: "to get a true reading of your chamber, use cases that have been minimally resized (or neck sized only) and fired at least 2 or 3 times. The first firing of commercial ammunition and/or new brass may provide a fired case that is not yet fully formed to represent the datum length of your chamber. With the first firing of new ammunition or cases, you may even encounter a minus dial reading. This indicates that your chamber is at or near the SAAMI minimum dimension and that the first firing of the brass has not yet fully formed it to represent your true chamber length."
The instructions provide the typical advice to set a sizing die to bump the shoulder back .002-.003. However, the instructions do not say whether you should do anything differently for brass that reads below the SAAMI minimum or on once fired brass generally.
Given my readings, how would you approach setting a full-length sizing die?