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Rifles, Reloading, Optics, Equipment
Reloading
Bumped Shoulders too much
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<blockquote data-quote="Mikecr" data-source="post: 1314367" data-attributes="member: 1521"><p>Cam-Over has different meanings. One is built in with eccentric linkage design, the other is method.</p><p></p><p>Designed cam-over varies with different press designs. You can see it with movement of the ram through handle travel. The free ram raises, slows, stops, and finally lowers a bit.</p><p>Analogy in this is a lifter riding a cam lobe, going just past 0-Mark. The ram is a push rod.</p><p>My presses do this, I've yet to need interference contacts to bump shoulders 1thou after spring back(for bolt guns), but there are plenty of different situations out there.</p><p>For one, I don't use FL sizing dies for anything. And I would not vary my neck sizing lengths to adjust shoulder bumps anyway.. I use body dies for bumping, and neck dies for neck sizing.</p><p></p><p>Then you have presses(some very powerful) with no built in cam-over. With enough leverage you can flex them enough to reach full handle travel, with great interference, like caused with die contacting shell holder. This does not actually provide any more leverage or difference to the sizing function. That extra effort is merely stressing the press.</p><p>If the reasoning for this is a sloppy press, I suggest a local dumpster could rid you of that problem, and don't ever stress your next press. If the die isn't right, and maybe the manufacturer recommends interference contact, don't. Work around it or fix it with a better plan.</p><p></p><p>The worst plan I've seen is the common -raise the ram, screw the die down to contact the shell holder, + 1/8 turn for cam-over, with no followup verification of results. </p><p>Probability of correct bumping here is nearly nothing..</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1314367, member: 1521"] Cam-Over has different meanings. One is built in with eccentric linkage design, the other is method. Designed cam-over varies with different press designs. You can see it with movement of the ram through handle travel. The free ram raises, slows, stops, and finally lowers a bit. Analogy in this is a lifter riding a cam lobe, going just past 0-Mark. The ram is a push rod. My presses do this, I've yet to need interference contacts to bump shoulders 1thou after spring back(for bolt guns), but there are plenty of different situations out there. For one, I don't use FL sizing dies for anything. And I would not vary my neck sizing lengths to adjust shoulder bumps anyway.. I use body dies for bumping, and neck dies for neck sizing. Then you have presses(some very powerful) with no built in cam-over. With enough leverage you can flex them enough to reach full handle travel, with great interference, like caused with die contacting shell holder. This does not actually provide any more leverage or difference to the sizing function. That extra effort is merely stressing the press. If the reasoning for this is a sloppy press, I suggest a local dumpster could rid you of that problem, and don't ever stress your next press. If the die isn't right, and maybe the manufacturer recommends interference contact, don't. Work around it or fix it with a better plan. The worst plan I've seen is the common -raise the ram, screw the die down to contact the shell holder, + 1/8 turn for cam-over, with no followup verification of results. Probability of correct bumping here is nearly nothing.. [/QUOTE]
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Bumped Shoulders too much
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