Quote:
Originally Posted by Drew Hause
There is no data suggesting an increase pressure using modern 12g 2 3/4" plastic hulls (many of which are slightly shorter than 2 3/4") in 2 5/8" chambers.
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The way the measurement is taken is after the shell is fired. I have picked up empty modern 12 g hulls and compared them and found significant variations in overall fired length. However, and this is important, while I have found many that were shorter than 2 3/4", some significantly, I've never found one that measured over 2 3/4".
Spend some time looking for and measuring fired hulls and segregate the shorter ones. Then, spend some time looking for stats on the loads, particularly looking for chamber pressures (which are hard to get your hands on). Then, choose a shorter load with a lower pressure and with lower payload and velocity and you'll be fine, provided your gun is sound.
Here's an example of a "before firing measurement". Note how much less than 2 3/4" the shell is. Then, notice that this is a vintage era
3" magnum load and only measures 2 1/2" loaded.
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