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| < 16ga. Ammunition & Reloading ~ Looking for Polywad Spred-R inserts |
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 Posted:
Thu May 25, 2023 3:34 pm
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Joined: 14 Feb 2022
Posts: 26
Location: Evaro, MT
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| JTA, the ones I found online were about .75” in diameter, and 16 ga requires .5”. The shape is perfect, though. |
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Jockc
Evaro, MT |
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| Posted:
Sat Jun 10, 2023 4:24 pm
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Joined: 14 Feb 2022
Posts: 26
Location: Evaro, MT
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Gentlemen, with the help of the samples I received I went to our county library and fabricated some nearly exact copies. After some of the things said about copyright infringement I’m a bit leery about posting the design file (though, as one person pointed out, they came out in 1985, meaning that any trademark is likely long expired). I’m open to any guidance; the design file is only 40kb..
The 3D printer support person suggested we construct a design file instead of of scanning the sample I brought. As he pointed out, it was simply two columns (one wide, thin one—the disc—and one small diameter tall one—the post), and after taking all dimensions with a pair of calipers he built a design file in a couple minutes (as opposed to the half hour or more that a scan would have taken).
We then ran off some samples out of a biodegradable but fairly strong plastic (he had a wide variety of different materials there). The samples were perfect, so I asked him to run off more (and I’ve forgotten whether I specified 25 or 50). That represented several hours of printing, and I just received word they are ready. I haven’t patterned any yet or checked the weight of the copies relative to the originals.
My total out of pocket cost, based on grams of plastic used, is $1.75. Jim, Michael, I’m happy to send you some of the copies I ran off.
Let’s hear it for libraries! |
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Jockc
Evaro, MT |
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| Posted:
Thu Nov 23, 2023 6:21 am
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Member
Joined: 08 Oct 2006
Posts: 1398
Location: Tappahannock, Virginia
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| Just checking up on this older thread, did you ever load or pattern your printed inserts? Just curious how it worked out…. |
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| Posted:
Thu Nov 23, 2023 10:20 am
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Joined: 09 Aug 2007
Posts: 529
Location: WI
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I have a 3D printer. Just made a hull trimmer similar to the one on Ebay, works pretty well.
The great thing about additive manufacturing is that complexity is free, so I was easily able to add a ramp to help peel the hull trimming off and also cover the blade so if you grab onto it you won't puncture yourself:
How long is the pin on the insert? I could easily make a bunch of these, I did this one in about 10 minutes, from starting the design to finished print:
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| Posted:
Thu Nov 23, 2023 10:38 am
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Joined: 07 Mar 2010
Posts: 515
Location: South Eastern PA
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| Posted:
Thu Nov 23, 2023 4:49 pm
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Joined: 09 Aug 2007
Posts: 529
Location: WI
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I have some of those X spreader inserts from BPI, but I haven't had a chance to pattern them yet.
Anyone have any feedback on those?
Injection molding will always be cheaper than 3D printing, if the volume demand is there to support the cost of the dies. That is where the real expense comes in. |
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| Posted:
Sun Apr 05, 2026 2:49 am
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Joined: 06 Oct 2007
Posts: 2545
Location: West MI
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Reposting here, seems more pertinent.....
What a world, from halfway around the globe for $2, can't imagine why they won't work....
https://www.alibaba.com/product-detail/Customized-Logo-Printed-Plastic-17mm-Golf_60259447887.html?fromPlat=buyer_ops&mt=mail&crm_mtn_tracelog_log_id=122283504773&s_id=push-task_118607&t_id=2000114762&c_id=233397&as_token=J8pIrRYnAStlJEgoeezAS6Yh9DvbFDUQDFBr%2BQau%2FVcs7dvf&to=mobrik%40comcast.net&from=credit%40notice.alibaba.com
Intention is to load and compare some but again can't see how they won't work.
Update, in a very non scientific and rushed field study, it was raining a lot yesterday so paper was out of the question so took the patterning to the 21yard steel grease plate at our range. 1oz #7.5 SG16 GreenDot ho-hum target recipe in 2.75" Ched hulls, 6 fold. 28" BPS w/Trulock Full choke tube.
Loaded 3- 1oz w/o insert, 3- 7/8oz w/insert on top & 3- 7/8oz w/100grn of shot on top of insert...of course with the posts sticking down in the shot.
Taking pictures, in the rain, of little grey splotches on a grey grease plate was futile.
w/o insert avg 16-18"dia very dense typical F pattern @21y
w/insert on top 19-21" still quite dense
w/insert under 100grn shot 22-24" somewhat center dense but even outer ring, I wouldn't hesitate to throw that at 20y birdie or bunny. |
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Sorry, I'm a Duck Hunter so shouldn't be held strictly responsible for my actions between Oct 1st and ice up. |
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| Posted:
Sun Apr 05, 2026 4:11 am
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Member
Joined: 19 May 2006
Posts: 713
Location: Too far south in New England
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| nj gsp wrote: |
I have some of those X spreader inserts from BPI, but I haven't had a chance to pattern them yet.
Anyone have any feedback on those?
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They work well. As always it depends on the load and barrel/choke. Polywads work slightly better in most cases, and there is more options for placement in the column, whereas the x spreader is either bottom or top of the shot column.
X spreaders fit perfectly in a Z16, and can be a good fit in the SG16 with a bit of maneuvering around the bumps in the wad. I typically use them with an SG16 in my match loads. I save the polywads for my hunting loads. |
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"You keep saying that word. I do not think it means what you think it means" - Inigo Montoya |
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