Lost Sheep
New member
Lightweight bullets jumping crimp? Not.
S&W does recommend against lightweight bullets in their scandium guns, but it is my understanding that the reason is erosion at the throats and (perhaps) cracking of the forcing cone.
Consider the extreme cases. A bullet that weighs nothing, no matter how hard the gun recoils cannot have the inertia required to jump crimp. On the other hand, a bullet that is anchored to the center of the Earth (tantamount to being VERY massive) will almost certainly pull out of its case when its neighbor is fired.
Now, I REALLY REALLY want to launch into a dissertation of why the lightweight very very fast bullet penetrates less than a heavier one with the same energy, but I don't want to use up the column space. Suffice it to say that an expanded bullet (like a 110 grain) presents more frontal area than an unexpanded bullet (a 125 grain that failed to expand, or a 158 grain solid).
Terminal ballistics is truly "Weird Science".
Respectfully, Lost Sheep
Remember, only believe half of what you see and one quarter of what you hear. That goes double for what you get from the internet. Even this post. Maybe especially this post.
Do your own independent, confirming research when ANYONE gives you new facts on the web.
Also remember, even the idiotic stuff might have a kernel of truth buried in there somewhere.
Lost Sheep
Webleymkv, you should probably review your physics. Very lightweight bullets have less inertia than heavier bullets, therefore have less of a tendency to jump crimp when subjected to heavy recoil from its siblings earlier in the firing rotation. Its the HEAVY bullets with heavy loads in a LIGHTWEIGHT gun that bullets pulling out of their cases is a concern.Webleymkv said:It's not a bad loading as it delivers ballistics similar to a 9mm +P. The main disadvantages are that it will have less penetration than a heavier bullet and will likely shoot low in fixed-sighted revolvers (most .357's come from the factory sighted in for either 125grn or 158grn bullets). Also, very light revolvers like the S&W 360PD often have trouble with very light bullets jumping crimp under recoil. S&W actually reccomends against the use of bullets lighter than 120grn in their Scandium J-Frames.
S&W does recommend against lightweight bullets in their scandium guns, but it is my understanding that the reason is erosion at the throats and (perhaps) cracking of the forcing cone.
Consider the extreme cases. A bullet that weighs nothing, no matter how hard the gun recoils cannot have the inertia required to jump crimp. On the other hand, a bullet that is anchored to the center of the Earth (tantamount to being VERY massive) will almost certainly pull out of its case when its neighbor is fired.
Now, I REALLY REALLY want to launch into a dissertation of why the lightweight very very fast bullet penetrates less than a heavier one with the same energy, but I don't want to use up the column space. Suffice it to say that an expanded bullet (like a 110 grain) presents more frontal area than an unexpanded bullet (a 125 grain that failed to expand, or a 158 grain solid).
Terminal ballistics is truly "Weird Science".
Respectfully, Lost Sheep
Remember, only believe half of what you see and one quarter of what you hear. That goes double for what you get from the internet. Even this post. Maybe especially this post.
Do your own independent, confirming research when ANYONE gives you new facts on the web.
Also remember, even the idiotic stuff might have a kernel of truth buried in there somewhere.
Lost Sheep