Fact or fiction?

[shabee]

You are now trying to split hairs and go the the Nth degree to disprove the theory 1)
What you say above will be true for a given weight of pellet (more likely a lead slug) or given restriction in the bore, but to slow the piston with back pressure enough to quell the dieseling will take more than a pellet marginally heavier than the norm.

your original statement:

"Using a heavier pellet will cause the pressure (and temperature) to spike higher and earlier in the shot cycle.... In a gun that is marginal on dieseling, this increase in pressure and temperature can cause dieseling to occur".

Still holds true for a pellet a few grains heavier, If we then talk about slowing the piston enough to slow the compression rate and hence lower the temperature to tame the dieseling then we are not talking about a slightly heavier pellet are we? because a slightly heavier pellet will not produce the effect you now decide to bring to the table. Also its not just about the inertia that a heavier pellets creates it is as much about slowing the outflow from the compression cylinder without unduly slowing the piston stroke, and a light but tight fitting pellet would have the same effect. There are so many measures of these events that can be created by using different pellet weights and upto a complete blockage that they cannot all be covered by theory 1. As someone else quite correctly wrote "its all a matter of extent". Piston weight, piston diameter, piston stroke, spring strength, caliber will all play a part in the events leading to the dieseling and what happens in one gun wont necessarily happen in the next, but for the purpose of this thread we are bound by your statement.
eric

[Leonardj]

You are now trying to split hairs and go the the Nth degree to disprove the theory 1) Seems to me like you are doing much the same to support the original theory.
What you say above will be true for a given weight of pellet (more likely a lead slug) or given restriction in the bore, but to slow the piston with back pressure enough to quell the dieseling will take more than a pellet marginally heavier than the norm. I have found that a gun that attains detonation with an 8 grain pellet, will not attain detonation when a few 10.5 grain pellets are fired through it. This is fact, not theory.

your original statement: Not MY statement

"Using a heavier pellet will cause the pressure (and temperature) to spike higher and earlier in the shot cycle.... In a gun that is marginal on dieseling, this increase in pressure and temperature can cause dieseling to occur".

Still holds true for a pellet a few grains heavier, If we then talk about slowing the piston enough to slow the compression rate and hence lower the temperature to tame the dieseling then we are not talking about a slightly heavier pellet are we? because a slightly heavier pellet will not produce the effect you now decide to bring to the table. Also its not just about the inertia that a heavier pellets creates it is as much about slowing the outflow from the compression cylinder without unduly slowing the piston stroke, and a light but tight fitting pellet would have the same effect. There are so many measures of these events that can be created by using different pellet weights and upto a complete blockage that they cannot all be covered by theory 1. As someone else quite correctly wrote "its all a matter of extent". Piston weight, piston diameter, piston stroke, spring strength, caliber will all play a part in the events leading to the dieseling and what happens in one gun wont necessarily happen in the next, but for the purpose of this thread we are bound by your statement. Once again, not MY statement.
eric

It appears that we shall have to agree to disagree, based on our own individual experiences.