Low velocity expansion thought.

Tom

Well-Known Member
Reading the getting started with 300bo thread and the problems with subs punching little holes got me thinking. Ok, I know, thinking is too strong a word for what I do.
I've never tried it, but it seems to me that sealing a drop of liquid in a hp could result in violent expansion.
I looked at several experiments on the web and it appears to be too much of a good thing, with some projectiles coming unglued and poor penetration. Maybe playing with cavity size could find the right balance? Obviously, bc wouldn't be optimal, with epoxy, hot melt, etc creating a flat tip. Has anyone tried this as a solution for cast subs?
 

RBHarter

West Central AR
I've rambled with the Bronze/Silver tip hard point expander thing but I never did with it much past 1/16" and 1/8" aircraft aluminum rivets and deciding that a round head had the best chance and that keeping them in place would be the challenge .

Liquid steel in a fitted form mould might eliminate the fall out and certainly the shape hang up .
 

RBHarter

West Central AR
My avitar is alloy manipulation of a 200 gr Spitzer shaped 30 cal shot in an SKS with an MV of 1600 fps . Impact in dry powdered clay resulted in a .610 dia from .312 and averaged 196 gr retained .
Alloy was from my handy 50/50 WW and tamper seals with copper in solution my goal was to make a 7.62×39 shoot a decent group with a .3165 groove that would chamber a 323-175 2R @ .323 dia with a 318 nose effectively making it an 8×39 .
 

358156 hp

At large, whereabouts unknown.
Reading the getting started with 300bo thread and the problems with subs punching little holes got me thinking. Ok, I know, thinking is too strong a word for what I do.
I've never tried it, but it seems to me that sealing a drop of liquid in a hp could result in violent expansion.
I looked at several experiments on the web and it appears to be too much of a good thing, with some projectiles coming unglued and poor penetration. Maybe playing with cavity size could find the right balance? Obviously, bc wouldn't be optimal, with epoxy, hot melt, etc creating a flat tip. Has anyone tried this as a solution for cast subs?

I've seen rifle bullet swagers do a similar thing for long-range varmint bullets. A drop or so of mineral oil, crimped into a nose cavity. That crimping step might be the deal killer though since it requires specialized tooling. I have also seen melted wax dripped into hollowpoint cavities, then struck off level. And BBs, of course, just not in tube magazine guns. You get the idea.
 

fiver

Well-Known Member
fill the hollow they will openstriate the nose and they will open predictably every time.
elvis ammo has a video shooting some stuff into gel block.
the tips have been pre-programmed to open and the hollow points have been filled with caulk.
I had Charlie folloe my directions and he sent the bullets to elvis for testing.
Elvis was impressed that they worked just like he was told they would.
 

KHornet

Well-Known Member
Some years back, had a HP mold with a large pin, that cast
a hollow big enough to hold a commercial BB. Think it was
a 44 GC, and it shot well, and tore the crap out of the back
side of a 2x4 at 15-20 paces in a mag loading.

Paul