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Rifles, Reloading, Optics, Equipment
Reloading
Sinclair bump gauge error
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<blockquote data-quote="o2bmark" data-source="post: 3011637" data-attributes="member: 6358"><p>While working up a load for my Christensen Arms rifle I found the disparity between datum line measurements and Sinclair tapered insert measurements for setback amount. The problem shows up on FL sized cases where not only is the shoulder set back but also the diameter of the body where it meets the shoulder is reduced apparently allowing case to go further into the insert/die. This is misleading as to actual setback and gives a larger value. If the Sinclair insert taper were to accurately mimic the angle of the shoulder and sit flat on it then in theory the diameter of case would not influence the reading. What seems to be happening is the die is measuring at the radius (corner/edge) from shoulder to body of case. I'm using #20 insert on 308win case with Redding FL dies. With my FL die setup the difference between fired and resized setback is .002" compared at several different datum diameters. Sinclair indicates .007" of setback. The case diameter just before Shoulder is reduced .002" from fired.</p></blockquote><p></p>
[QUOTE="o2bmark, post: 3011637, member: 6358"] While working up a load for my Christensen Arms rifle I found the disparity between datum line measurements and Sinclair tapered insert measurements for setback amount. The problem shows up on FL sized cases where not only is the shoulder set back but also the diameter of the body where it meets the shoulder is reduced apparently allowing case to go further into the insert/die. This is misleading as to actual setback and gives a larger value. If the Sinclair insert taper were to accurately mimic the angle of the shoulder and sit flat on it then in theory the diameter of case would not influence the reading. What seems to be happening is the die is measuring at the radius (corner/edge) from shoulder to body of case. I’m using #20 insert on 308win case with Redding FL dies. With my FL die setup the difference between fired and resized setback is .002” compared at several different datum diameters. Sinclair indicates .007” of setback. The case diameter just before Shoulder is reduced .002” from fired. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Sinclair bump gauge error
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