Interesting, these are from a 2 5/8 V grade
I havent experienced anything as described, shells are labeled 2 3/4, but fired measurements are 2.67
Therein lies the problem. The fired length of nominal 2 3/4" shells is almost never 2 3/4". At one point, I had quite a collection of once-fired hulls, both American and foreign. I can't recall any that were longer than 2 3/4", and some were quite a bit shorter. The difference in whether you might end up with blown ends on the shells--as shown in Doc Drew's post--might well be a question of just how much shorter they were. Some guns with 2 1/2" chambers--especially true of those going back to the 19th century--won't work well even with British shells from boxes that tell you they're appropriate for use in guns with 2 1/2" chambers. Result being the blown ends you see in Doc Drew's post. And reports of sharp recoil. At which it's time to stop doing what you're doing and use only true 2 1/2" hulls in those guns. The problem seems to be short and sharply tapered forcing cones. More of a "step" than a cone.
Many of us--having read Sherman Bell's report on long shells in short chambers--have reloaded standard American 2 3/4" hulls to appropriate low pressures and used them in guns with short chambers, without incident. But it clearly does not work with all 2 3/4" hulls in all guns with chambers which measure shorter than that.
