Compound Rounds from Sureshot

jagerbond · Thu Jun 18, 2009 2:52 am

jackssmirkingrevenge wrote:I still think an ordinary bolt would have sufficed as an insert and been a bit more durable, but in any case as per e-mail this is a fantastic result and it's good to see it was worth all the effort you put into it

Yes, lead was what gave me the 1/2 caliber CG/CP differential... I agree though, carriage bolts would look nice and work well too. I am planning on some steel penetrator rounds for damage videos.

Gaderelguitarist · Thu Jun 18, 2009 10:40 am

I am planning on some steel penetrator rounds for damage videos.

Yes!

What would be very interesting would be to make a round of UHMW with a mounting hole that can except either the lead nose or a steel nose.

Then you could sell not only the plastic portion, but also an assortment of metal tips.

jagerbond · Fri Jun 19, 2009 2:12 pm

Gaderelguitarist wrote:
I am planning on some steel penetrator rounds for damage videos.
Yes!

What would be very interesting would be to make a round of UHMW with a mounting hole that can except either the lead nose or a steel nose.

Then you could sell not only the plastic portion, but also an assortment of metal tips.

These have a 3/8" hole from nose to tail so you can add your choice of toppings.

MountainousDew · Fri Jun 19, 2009 2:17 pm

I noticed when I was looking over the pictures that the lead parts don't screw in, have any of them fallen out?
Or are they a tight enough fit?
That's what she said!

Edit: Have you tested these rounds in a pneumatic?

jagerbond · Fri Jun 19, 2009 2:29 pm

MountainousDew wrote:I noticed when I was looking over the pictures that the lead parts don't screw in, have any of them fallen out?
Or are they a tight enough fit?
That's what she said!

Edit: Have you tested these rounds in a pneumatic?

The lead caps have a coaxial bulge on the stem. We use a rubber hammer and tap them in. They fall out on impact sometimes, if they're not all bent up you can tap them back in and re-shoot.

jagerbond · Fri Jun 19, 2009 2:31 pm

MountainousDew wrote:
Edit: Have you tested these rounds in a pneumatic?

We have not yet, but hope to soon.

jeepkahn · Fri Jun 19, 2009 2:44 pm

Any word on smaller bore projectiles??? 1" and .5" maybe???

MountainousDew · Fri Jun 19, 2009 2:46 pm

jeepkahn wrote:Any word on smaller bore projectiles??? 1" and .5" maybe???

Yeah, any word(s)?!

And have you fired the normak UHMW rounds in a pneumatic?

jagerbond · Fri Jun 19, 2009 2:52 pm

jeepkahn wrote:Any word on smaller bore projectiles??? 1" and .5" maybe???

1" material came in just the other day with 1.75, and 2.5" so they'll be along shortly... next week probably

jagerbond · Fri Jun 19, 2009 2:53 pm

MountainousDew wrote:
jeepkahn wrote:Any word on smaller bore projectiles??? 1" and .5" maybe???
Yeah, any word(s)?!

And have you fired the normal UHMW rounds in a pneumatic?

Not yet... Soon though

dewey-1 · Fri Jun 19, 2009 2:54 pm

jagerbond;

You have to show the "weeble-wobble hula dance" video.
This shoud give people an idea of its center of gravity.

jagerbond · Fri Jun 19, 2009 3:05 pm

dewey-1 wrote:jagerbond;

You have to show the "weeble-wobble hula dance" video.
This shoud give people an idea of its center of gravity.

OK OK

[youtube][/youtube]

MountainousDew · Sat Jun 20, 2009 1:21 pm

Do you think you could make a round for a 2 1/2 SDR sch 21 barrel?

It will be a while before I finish the gun, since I still in the design phase, but it will have a Soda can barrel... I drink a lot of Mountain Dew so why not recycle the cans by shooting them, right? I get to have fun and save the planet, sorta.

I measured the can and it came out to be a little over 65mm and Wikipedia agreed. I don't know the exact diameter since I was just using 2x4s and a plastic ruler, so it might have a larger diameter than the 2.5 inch stock you have...

USGF · Sun Jun 21, 2009 5:40 am

MountainousDew wrote:Do you think you could make a round for a 2 1/2 SDR sch 21 barrel?

SNIP

I measured the can and it came out to be a little over 65mm and Wikipedia agreed. I don't know the exact diameter since I was just using 2x4s and a plastic ruler, so it might have a larger diameter than the 2.5 inch stock you have...

MD, I'm pretty sure the stock will be oversize. It may be close to 65mm. I checked a soda can here and it is 66mm. SDR 21 in 2-1/2 is supposed to be 2.655" nominal, approx 67.44mm. I'll go over the dimensions with Mike. I know the sched 40 2-1/2" rounds are on the agenda.

EDIT: Hold on, I found the material. It measures approx 65.6mm as it is not perfectly round

USGF

dewey-1 · Sun Jun 21, 2009 7:28 am

USGF wrote:
MountainousDew wrote:Do you think you could make a round for a 2 1/2 SDR sch 21 barrel?

SNIP

I measured the can and it came out to be a little over 65mm and Wikipedia agreed. I don't know the exact diameter since I was just using 2x4s and a plastic ruler, so it might have a larger diameter than the 2.5 inch stock you have...
MD, I'm pretty sure the stock will be oversize. It may be close to 65mm. I checked a soda can here and it is 66mm. SDR 21 in 2-1/2 is supposed to be 2.655" nominal, approx 67.44mm. I'll go over the dimensions with Mike. I know the sched 40 2-1/2" rounds are on the agenda.

EDIT: Hold on, I found the material. It measures approx 65.6mm as it is not perfectly round

USGF

I think your ID of 2.655 is the max ID for SDR26 not SDR21 at a 2-1/2 OD.
I get 2.581 nominal ID for SDR21. Min Max range of 2.554 to 2.608 worst case.

USGF Did you try the pipe ID speadsheet?