There is actually only one 'right' method to check long cases in short chambers. Just load lead caliber slug in long case and fire it through your gun with short chambers. If fired case, its throat looks not good or broken, these particular cases are not suitable for this gun.
Actually I don't care about peak pressures, light or hot loads and Sherman Bell article, but if cases throat is damaged or broken after slug firing, I'd suggest to stay away from these cases or cut them to right length.
Correct Geno.....!.....
If you fire 2.75" hulls in a 2.5" chamber & forcing cones that have not been "butchered" it will usually exit the chamber with the star crimp still partially closed...visible in your hand.....and the modern plastic wads will strip off plastic while passing through the forcing cones with the 2.75" star crimps folded partially out into the cones, thus leaving plastic residue in the barrels..........
2.5" hulls will open properly and will not strip plastic while passing the forcing cones because the star petals are completely open and laying flat in the chamber.....as they are supposed to.......
All the old 2.5" chamber guns were made when roll crimped paper shells were in vogue........as an example:---if you shot a fiber wad, roll crimped paper hull of 2.75" length in a 2.5" chamber it would open flat and create no problems........roll crimped paper, not plastic star crimp...........again the key words are "un-butchered cones and chambers"....i.e. original factory short chambers and cones........these 2.5" chambers deserve 2.5" hulls, plastic or paper, rolled or star crimped.....loaded to whatever suits your needs............IMO..........
