JCSC
Member
I am not having any issues, but curious on some experienced thoughts on what causes noticable pressure changes.
Here is a scenario and some thoughts I have, relating to reloading 9 mm.
Lets say that I am currently using "x" bullet. With all bullets, I tend to save one in small plastic ziplock and blueprint the bullet to some extent. length, weight, etc.
Once I have an established load, this allows me to calculate the internal axial depth from the bottom of the seated bullet, to the internal face of the casing, thus giving me a known internal volume.
Let's say that I chose to switch from a Hornady 124gr HP to a Berrys 124gr FP. If I am conscious about insuring I maintain the same internal volume, (provided the subsequent OAL is allowable), can I assume that I would see similar safe pressure situations across both projectiles, or any others for that matter, provided they have a flat base.
I could be way off line, but my thought was that if I maintain a consistent internal volume, regardless of bullet, I should see no changes, other than additional pressure from a bullet weight change or change in rifling / bearing contact surface.
Does the bullet / rifling amount of contact alter internal pressure significantly?
I would never shortcut my reloading practices, or not refer to manuals. I only load for about 6 calibers, but for interchanging pistol bullets, I am curious if my thoughts are sound.
Here is a scenario and some thoughts I have, relating to reloading 9 mm.
Lets say that I am currently using "x" bullet. With all bullets, I tend to save one in small plastic ziplock and blueprint the bullet to some extent. length, weight, etc.
Once I have an established load, this allows me to calculate the internal axial depth from the bottom of the seated bullet, to the internal face of the casing, thus giving me a known internal volume.
Let's say that I chose to switch from a Hornady 124gr HP to a Berrys 124gr FP. If I am conscious about insuring I maintain the same internal volume, (provided the subsequent OAL is allowable), can I assume that I would see similar safe pressure situations across both projectiles, or any others for that matter, provided they have a flat base.
I could be way off line, but my thought was that if I maintain a consistent internal volume, regardless of bullet, I should see no changes, other than additional pressure from a bullet weight change or change in rifling / bearing contact surface.
Does the bullet / rifling amount of contact alter internal pressure significantly?
I would never shortcut my reloading practices, or not refer to manuals. I only load for about 6 calibers, but for interchanging pistol bullets, I am curious if my thoughts are sound.