P
pacecil
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To boyd allen & alinwa - Nowhere did I say that firing pin fall, primer ignition, pressure rise, or bullet jump had no effect on accuracy. What I said was, these things had no significant effect on VIBRATIONS. The effect of these is through factors such as combustion, velocity, and bullet deformation, and this is what contributes to inaccuracy. It seems we've gotten to the point that every thing that happens at the target was caused by vibrations.
When it comes to the "pressure effect on vibration" I probably should have said that pressure ALONE will have no significant effect. It has to act through the bullet or through the bolt face.
To vibe - You said..Since there have been reports of (sometimes significant) changes I don't understand. What are the changes that prove pressure created significant vibrations? Also are you certain you know exactly where the center of gravity is in the parts of the rail gun moving in recoil, so that you can be sure all moments were eliminated?
To Tim in tx - You are confusing what you measure as outside barrel shape in a lathe as having any bearing on how the bore is shaped. You are also making assumptions that where thr bullet prints on the target tells you where the muzzle is in it's vibration cycle. Probably all that can be said about these assumptions is: they MIGHT be right.
To bob kingsbury - Point of impact will probably change as a barrel is moved in it's mounting. This is of no importance. What is important is how group size might change. Also, once you have altered a barrel so it can be indexed, you can't "refit back without the insert".
When it comes to the "pressure effect on vibration" I probably should have said that pressure ALONE will have no significant effect. It has to act through the bullet or through the bolt face.
To vibe - You said..Since there have been reports of (sometimes significant) changes I don't understand. What are the changes that prove pressure created significant vibrations? Also are you certain you know exactly where the center of gravity is in the parts of the rail gun moving in recoil, so that you can be sure all moments were eliminated?
To Tim in tx - You are confusing what you measure as outside barrel shape in a lathe as having any bearing on how the bore is shaped. You are also making assumptions that where thr bullet prints on the target tells you where the muzzle is in it's vibration cycle. Probably all that can be said about these assumptions is: they MIGHT be right.
To bob kingsbury - Point of impact will probably change as a barrel is moved in it's mounting. This is of no importance. What is important is how group size might change. Also, once you have altered a barrel so it can be indexed, you can't "refit back without the insert".
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