rfwobbly
Member
Plunk & Spin (as I call it) tells you THAT particular round fits your barrel. The problem is it it doesn't give you a "absolutely don't go any longer than this" type number. And without that number you don't know if the clearance is 0.002" or 0.050".Ah, the firing OOB issue had escaped me. So help me out here: All of these rounds plunk and they are within SAAMI COAL max. Does that not equal fitting the barrel?
All production has manufacturing tolerances, and that includes your ammo production. So your OAL is not really a single number, but rather a ranges of numbers you say are good enough for your purposes. What if the bullet-to-barrel clearance for the cartridge you plunked is only 0.002", but you've decided your manufacturing tolerance is going to allow +/-0.007" ? You can see right off that cartridges +0.003" and longer are going to cause trouble. Cartridges out at the extreme +0.007" tolerance will interfere by +0.005" and may cause an OOB condition.
Since unplanned trips to the ER are not a favorite, I like to actually measure and KNOW the chamber length. In that way I can set my OAL so that even at my longest production length, every cartridge always has room in the chamber.
Hope this helps.