New Twist on an Old Design

[sdporter]

Here it is, ready to cast. It will be this evening before I get a chance. Gotta go earn some money to make up for the last couple of days worth of screwing around with this.

 

[sdporter]

Have any of you ever lapped a cavity on a mould before? I don’t think it would be too hard, but I would love a mirror polish on the inside. A cheap “across the pond” lathe and self cut cutting tools are not conducive to a super great finish...

 

[sdporter]

Okay, now I gotta go to work....
Couldn’t resist. They drop at .510 which is .001” larger than I wanted. I gotta get a new lathe.
They are sticking in the right side of the mould, which is a pain, but I’ll get that figured out.
It was “dead on” centered in the chuck when I bored the bullet profile. So I don’t know what the heck there. Hopefully just some burrs I missed.
BTW, don’t use mould release when the mould is hot. The bullet in my hand was after I sprayed that stuff in there.

 

[sdporter]

This one

 

[sdporter]

Okay, a TOTALLY different spin. Just goofing off now.

 

[sdporter]

Casted 146 of them. The majority seem to weigh in between 409 and 410 grains. I had 1 at 405 grains and 1 at 411 grains. Massive swing in weight, I know, but I get a different number every time I turn the scale off and back on again. It’s a little Hornady digital guy. 99 of the 146 are within 2 grains from 408.5 - .410.5. Gonna shoot em all anyway...

 

[Sideshow]

Casted 146 of them. The majority seem to weigh in between 409 and 410 grains. I had 1 at 405 grains and 1 at 411 grains. Massive swing in weight, I know, but I get a different number every time I turn the scale off and back on again. It’s a little Hornady digital guy. 99 of the 146 are within 2 grains from 408.5 - .410.5. Gonna shoot em all anyway...

Golly Stacy that swings not so good but neither is that scale . Im not so sure id trust Anything it said .

 

[michiganmuzzy]

Casted 146 of them. The majority seem to weigh in between 409 and 410 grains. I had 1 at 405 grains and 1 at 411 grains. Massive swing in weight, I know, but I get a different number every time I turn the scale off and back on again. It’s a little Hornady digital guy. 99 of the 146 are within 2 grains from 408.5 - .410.5. Gonna shoot em all anyway...

Change the battery.

 

[Sideshow]

Have any of you ever lapped a cavity on a mould before? I don’t think it would be too hard, but I would love a mirror polish on the inside. A cheap “across the pond” lathe and self cut cutting tools are not conducive to a super great finish...

What about 0000 steel wool on a sloted wooden dowl rod and wrapped around it ?? I think id try that . Compounds might plug the vents and be hard to get out of there . If you think it wouldnt be so bad id put rouge on a big bore mop if i wanted more shine . Chuck it up , indicate it in , and spin it up fairly fast . Should work good without unneccasary size increases .

 

[52Bore]

Looks good.
I did some HP diameter testing with Ronlaughlin with my 50/475 mold - pure lead, I think we tested 3 HP diameters. When velocity slows to nearly speed of sound the HP needs to be nearly 1/2 bullet diameter.
Your bullet is lighter, but maybe not enough to matter at 400gr.
Rons BH209 35/50gr testing results are in the in-line section.

 

[Sideshow]

And thats about 200yds away slowing to about 1080fps (approx speed of sound) IF you put some Powder Behind It . The speed of sound varies a bit based on air temp also . Moral of the story is to use the Hottest charge you can and still have accuracy . THATS the science of that
Anything larger than about .180" hp Destroys bc . Deeper is better too at around .400" or so . This Works Best . Mr Goulds discoverys were very accurate . .

 

[Sideshow]

And thats about 200yds away slowing to about 1080fps (approx speed of sound) IF you put some Powder Behind It . The speed of sound varies a bit based on air temp also . Moral of the story is to use the Hottest charge you can and still have accuracy . THATS the science of that
Anything larger than about .180" hp Destroys bc . Deeper is better too at around .400" or so . This Works Best . Mr Goulds discoverys were very accurate .

Dont be duped into less .

 

[ronlaughlin]

..........BH209 35/50gr testing results are in the in-line section.

Rick,
Here is 0.21" diameter hollow point results.

The bullet was clocked at 973 fps right at 25 yard. From what you wrote, it is my understanding this would be the bullet speed out 275 yard using your hunting load?

 

[Sideshow]

Apples to oranges with his White concerning bh209 . Besides , no sub sonic flight theories in use ??

 

[52Bore]

Rick,
Here is 0.21" diameter hollow point results.

Thanks, nearly 1/2 diameter as I recall. Being a 50 the HP seems equally proportional to the 45HP.

 

[Sideshow]

Ignore what you will but thats the science of it . It also started out Well Above sub sonic for 973fps at 275yds .

 

[45-70]

Apples to oranges with his White concerning bh209 . Besides , no sub sonic flight theories in use ??

how you get good ignition shooting bh209 out of a white or am i reading it wrong

 

[52Bore]

Okay, a TOTALLY different spin. Just goofing off now.

sdpiorter. I do hope you are goofing off?
Ronlaughlin reduced test have overwhelming proved the tips are a detriment to a bullets explanation.

During the same timeframe, I made a tip myself for my bullet to test it’s possible POI change at 200yds.
3 bullets of each were shot and no change of impact was noticed - all 6 went into the same grouping. I looked for the “tip vs no tip” post, but it looks to have been deleted during the forum ownership changs.

 

[45-70]

how you get good ignition shooting bh209 out of a white or am i reading it wrong

thumbs up what

 

[Sideshow]

how you get good ignition shooting bh209 out of a white or am i reading it wrong

Reading it wrong Bob . Stacy cant use bh209 to get the high velocities needed to come close to 973fps at 275 yds . The sub sonic nonsense may be fine on the bench but has no place in the hunting realm at all . Had to take a bathroom break . Easy tiger !!!