These setback tests can be done safely at home if the firing pin is removed from the test gun. If the FPS won't stay in position, just tape it in place.
Doing this will avoid the pressure by other shooters at the range to make the firing line safe.
The data you provided in Post #18 tends to indicate reducing your excessive setback can only come through modifying your reloading procedures. The S & B cases I've measured show they're thick enough to provide a better grip on a jacketed bullet as long as:
• The fired cases are resized to a sufficiently small ID,
• The case mouths are flared as little as possible,
• The case neck expanding plug on your expanding/flaring die is not too large,
• The bullet OD's are large enough to stretch the case mouth during seating for a good grip on the bullet (sensed by the resistance felt in the press handle during seating),
• Little or nothing is done to the case mouth after the bullet is seated.
Matter of fact, your test handloads don't even need to be primed or filled with powder - they're just dummies to be slingshotted.
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
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