DIY Expanding/fracturing subsonic bullets
Posted: Fri Sep 23, 2016 2:42 am
Greetings
First, sorry for my bad grammary, I´m from Finland
Anyway, I needed expanding/fragmenting .30 subsonic bullets for varmint hunting. Target is quite small "Racoon dog", typically they weight 5-9 kg.
They are quite strong little critters, if you shoot them with FMJ, they will run far away unless you hit head or heart.
Bullet should "open" very fast, lethal area of these animals is just 4-6" thick.
That time, Lehigh bullets (or others like that) were not available in europe. Now I could get them from Germany, but price is still quite high.
So I though there must be some way to modify "normal" bullets to archieve at least somehow controlled fragmentation or expansion.
I spent lot of time in internet to find information, but didn´t find much. What is surprising.
Modified ammunition should also have decent subsonic accuracy, so I set my goal to consistent 1 moa.
I have bolt action rifle, so I didn´t need to take care of cycling etc. ar problems.
I did quite much testing, and it was very difficult to get subsonic 1 moa, even with not modified bullets.
In fact only accurate enough was H&N 165gr coated lead cast bullet.
Obviously it did not expand at all when tested to water jugs.
I tried many modifications, example drill very deep hollow point etc, but it didn´t help. They still acted like FMJ.
At last, I decided to radically split point of bullet in two. First I chamfered point of flat nose bullet slightly with normal drill.
Then made jig to center bullets to my milling machine, and split them with slitting saw.
See pic
When you shoot 1 gallon plastic jug with that bullet modified like that, those splitted "wings" will be break off (black line in pic shows where they crack).
Wings path will deviate about 30 degrees from rest of bullets path. Wings almost break 1 gallon jug backside, but not allways. Rest of bullet usually starts tumble in impact.
I have tried this maybe 7-8 times from 100yds, 100% succes.
From my small sample so far (abt 10 critters) this works as I planned.
None of them have run more than 1-2 feets after hit.
However, there has been some motion for 3-15 seconds. When I shoot them with supersonic V-max, motion normally ends righ away.
Has someone else done such research? Like I said, I didn´t find much more than hollowpoint drilling from internet.
First, sorry for my bad grammary, I´m from Finland
Anyway, I needed expanding/fragmenting .30 subsonic bullets for varmint hunting. Target is quite small "Racoon dog", typically they weight 5-9 kg.
They are quite strong little critters, if you shoot them with FMJ, they will run far away unless you hit head or heart.
Bullet should "open" very fast, lethal area of these animals is just 4-6" thick.
That time, Lehigh bullets (or others like that) were not available in europe. Now I could get them from Germany, but price is still quite high.
So I though there must be some way to modify "normal" bullets to archieve at least somehow controlled fragmentation or expansion.
I spent lot of time in internet to find information, but didn´t find much. What is surprising.
Modified ammunition should also have decent subsonic accuracy, so I set my goal to consistent 1 moa.
I have bolt action rifle, so I didn´t need to take care of cycling etc. ar problems.
I did quite much testing, and it was very difficult to get subsonic 1 moa, even with not modified bullets.
In fact only accurate enough was H&N 165gr coated lead cast bullet.
Obviously it did not expand at all when tested to water jugs.
I tried many modifications, example drill very deep hollow point etc, but it didn´t help. They still acted like FMJ.
At last, I decided to radically split point of bullet in two. First I chamfered point of flat nose bullet slightly with normal drill.
Then made jig to center bullets to my milling machine, and split them with slitting saw.
See pic
When you shoot 1 gallon plastic jug with that bullet modified like that, those splitted "wings" will be break off (black line in pic shows where they crack).
Wings path will deviate about 30 degrees from rest of bullets path. Wings almost break 1 gallon jug backside, but not allways. Rest of bullet usually starts tumble in impact.
I have tried this maybe 7-8 times from 100yds, 100% succes.
From my small sample so far (abt 10 critters) this works as I planned.
None of them have run more than 1-2 feets after hit.
However, there has been some motion for 3-15 seconds. When I shoot them with supersonic V-max, motion normally ends righ away.
Has someone else done such research? Like I said, I didn´t find much more than hollowpoint drilling from internet.