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gramps wrote: ... If I'm following things right the 460 velocity is in the same ball park as the 450B and uses it uses pistol bullets!!! Help, now I'm really confused. Will the 450B and the 460SW at 2100 fps or more cause the bullet to go POOF in a 1-16 barrel? Reading here and on Calguns.net sounds like they may. HELP!! ...
I haven't failed--Just found one more way not to do something.
pitted bore wrote:gramps wrote: ... If I'm following things right the 460 velocity is in the same ball park as the 450B and uses it uses pistol bullets!!! Help, now I'm really confused. Will the 450B and the 460SW at 2100 fps or more cause the bullet to go POOF in a 1-16 barrel? Reading here and on Calguns.net sounds like they may. HELP!! ...
Don-
A couple of points:
[1]
The 460 case capacity is slightly more than the 450B, and it has a higher SAAMI max pressure. I would expect the commercial 460 rifles that have been introduced recently to at least equal the 450 velocities with the same weight bullets. Because the 460 is a rimmed cartridge, it should be possible to crimp handloads really, really firmly.
[2]
I think that neither the 460 nor 450B will make pistol bullets go poof. The known exceptions are the plated 451 and 452 bullets that will toss off pieces of their plating when they exit the muzzle. I'm guessing it's a combination of high velocity, high spin rate, and the plating being cut by the rifling. As I recall, Hoot has had a chronograph whacked by the plating pieces.
You're right about the calguns thread raising the possibility of lighter pistol bullets coming apart at 450B velocities. Somewhere on that thread and in some 2009 threads in this forum I asked about this, and based on the answers decided to use the Hornady totally encapsulated 185-grain 451 bullets in my early experiments. I supposed that the heavy enclosure would prevent any disintegration in flight. There were no difficulties. You can read about the results in the first of several threads: 185-grain SWC trials - Chapter 1
Eventually, I was able to work up to about 3000 fps muzzle velocity with the 185-grain bullets. Here's a link to that thread:185-gr SWC, Chap. 8: 3000 FPS At Last. (Note that 3000 fps with 185-grain bullets is 300 Win Mag territory; recoil in a lighter rifle is noticeable.)
Based on the calguns warning, I decided to try to blow up some bullets. I purchased the Prvi Partizan soft points, and ran them at a muzzle velocity of 2900 fps. They didn't blow up on the way to the target. Full story on this thread: Trying to Blow Up a Bullet. T/wildcatter say's he's seen some bullets blow up from his early experiments with the cartridge, but he doesn't remember what bullets he used.
Your reservations about the use of pistol bullets are very appropriate when thinking about hunting. Hornady for good reasons only recommends their XTP Mag pistol bullets for reloading the 450B. Their non-mag pistol bullets are likely to go splat on game at 450B velocities.
[3]
I suspect that 1-turn-in-16-inches will be OK for most any bullet. John Barsness has a good article on "overstabilized" bullets in the latest issue of Handloader magazine. I selected the 1-in-24 twist for my heavy bolt gun simply because I wanted that part of its performance to equal that of the standard bushmaster barrels.
Keep us updated on your progress, and feel free to ask questions.
--Bob
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