I believe that one of S. Bell’s articles showed that the pressure peaks when the shot column has moved less than an inch and it is on its way down by the time the wad clears the shell mouth.
This would be within the insert, how much the insert adds to the barrel strength would be hard to say.
VH20;
My remarks about the 1.00" pressures were in responce to this. That fact was of course well known & proven before Bell was born. Certainly placing a strain gage at the 1" point over a chamber with an adapter inside whould show little or nothing as to what the pressure inside the adapter would be.
"IF HOWEVER" the purpose was to determine the relationship of "BBl Pressure" At least Three guns should have been tested. first a 28gauge itself, then the 12 & 16gauges Both having the same chamber lengths & as near as possible to same length cones. The strain gages should have then been placed the same distance from the breech in all cases & the same lot of shells fired for all three tests.
Lacking these parameters then I believe my statement regarding the Guernsey vs the Hampshire are still Very Valid.
I ask then What in Fact did we learn from this test. "IS" it reasonable to deduce the pressure is higher in the bigger bore "OR" is it more likely this was simply becauce it was taken Closer to the breech. Looking at available pressure curves once the peak has passed, within the chamber itself, we see a falling off from there forward.
"IF" the presure had been recorded at that same distance ahead of the end of the case in 12, 16 & 28 gauges what would it have read in all three. Personally I would expect it to be highest in the 28, next the 16 & lowest in the 12.
If you are totally honest about it I think you would have to agree this was not proved to be otherwise.
