Let me put a twist on this topic and assume that pressure and heat combined have the same effect on like metals, regardless of application. We can assume that a rifle chamber is the same as an engine combustion chamber and a like bore size can be affected by increasing its length or stroke. We can now make a comparison. BMEP is used in our trade as a measure of peak pressure. We can take an engine of the same bore size and increase the stroke length (chamber area). Now if we want to make the same power with the shorter stroked engine we must raise the peak cylinder pressure.The side effect of this if we are using like metals is the increased heat and pressure will cause increased erosion to the piston crown and valve seat surfaces. This fact remains the same regardless of engine size or horsepower.
<br>Enough of that. Ken is talking about throat erosion, this is a direct result of peak pressure and temperature and has nothing to do with attainable velocities, which are ideally gained by a constant pressure over the full length of the bbl.
<br>By reducing the 220 Howell to below the peak loaded pressure of a 22 Hornet, throat erosion should be less assuming the same cylinder temperures are achieved, which they likely are not as we are not trying to get the same power level. If we compare apples to apples and use the Howell cartridge to duplicate 22-250 or Swift velocities then I would agree throat erosion will be less and pressures can be reduced significantly and the same velocities will be achieved.
