Author Topic: Getting a NSA .22 to open up better ... a LOT better ! (Read 12175 times - 1 votes)
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Motorhead · « **on:** January 12, 2021, 07:13:13 PM »

First off not my idea, but taken from a few recent posts about low velocity slugs that mushroom easily. Thank you guys !!

So ... taking a #2 Phillips screw driver tip then dressing each blade web with a dremel tool cut-off wheel, we get each web a tad thinner / sharper.
* Took me 3 tries getting my grinding technique right & having control over equal thinning where it would contact the slugs hollow point making a uniform impression.

Placing a NSA slug on a piece of flat and thick leather, gave three TAP TAP TAP's on the end of driver tip with a small tac hammer so the hollow cavity of slug took on this look.
Once establishing how hard to strike was able to go threw a 375 count of NSA 20.2's in @ 45 minuets. Neurotic YES !!!

AS TO TESTING .... O' yes they now POP open where before was not that impressed

Shot from @ 20 yards into 1 gallon jug of water at @ 1040 fps a stock 20.2 HP passed right threw the jug exiting leaving a round hole ... had tried this prior with a few bottles in line to catch the slug. In the past recovered slug was only slightly opened at HP cavity and in no was mushrooming

MODIFIED with an X from tool described and shown, slug enters jug and does this !!! POP peeling away to the depth of the HP cavity in a near perfect clover leaf shape. Started as a .22 caliber and opened up to a .380" clover having no measurable weight loss still weighing 20.2 grains.

Chris USA · « **Reply #1 on:** January 12, 2021, 07:18:52 PM »

Excellent! I love home experimentation just like that. Well done!

wolverine · « **Reply #2 on:** January 12, 2021, 08:16:09 PM »

how did effect accuracy?

mrbulk · « **Reply #3 on:** January 12, 2021, 08:36:09 PM »

Awesome idea and relatively quick once one gets the hang of TAP-TAP-TAPPING it.👍🏼

Motorhead · « **Reply #4 on:** January 12, 2021, 08:39:02 PM »

Accuracy unchanged. symmetry is important and you want to keep the disruption of the meplat to a minimum

ranchibi · « **Reply #5 on:** January 12, 2021, 08:49:50 PM »

Awesome work Scott! Boy, that slug opened up perfectly and symmetrically...ouch, that would hurt! I bet you can’t wait to try those out on some ground squirrels! Will have to try that. Thank you for sharing 👍.

Paulemar · « **Reply #6 on:** January 12, 2021, 08:59:28 PM »

Great! Now I have another project seeking perfection.

Looks fantastic. Thanks!

Motorhead · « **Reply #7 on:** January 12, 2021, 09:12:40 PM »

Just did @ 100 JSA .177 @ 12.5 grains using a "0" size jewelers Phillips tip.

bear air · « **Reply #8 on:** January 12, 2021, 09:49:41 PM »

I'll be interested to see what those open up to Scott.

Frank in Fairfield · « **Reply #9 on:** January 12, 2021, 10:58:48 PM »

That is what we used to do with our .38 specials...
Dumb Dumb bullets..
Devastating on high desert jackrabbits..

Motorhead · « **Reply #10 on:** January 13, 2021, 12:49:46 AM »

Quote from: bear air on January 12, 2021, 09:49:41 PM

I'll be interested to see what those open up to Scott.

Well here is that anwser ...
12.5 grain at 20 yards into a jug of water ( @ 1020 fps )

KnifeMaker · « **Reply #11 on:** January 13, 2021, 02:21:27 AM »

Pretty interesting s Scott, Love-it! Simple, fast, inexpensive! What could you ask more of! But you know me, I just had to ask, so----
Pretty much were I started from. I will share tonight, or tomorrow how I get them to open at 400+ fps.

And very explosive at higher fps form a pcp long gun.

It is so simple that it is going to be a letdown. But doable, just has one more step in the name of long range accuracy.

Bonus, I will include a simple way to get perfect mushroom and not have explosive expansion in high fps slugs as well.

Well, maybe. For what ever reason, the ms card for my old Sony won't let me delete any pic's and it is full! GRRRRR!!

I'll put what I can over here--- Feel free to post there as well. We need to help folks out as much as we can.

https://www.gatewaytoairguns.org/GTA/index.php?topic=182487.0

Mike

Doug Wall · « **Reply #12 on:** January 13, 2021, 08:38:12 AM »

When I came up with that, about a year ago, I called NSA, and chatted with them about it. They had actually tried things like that, but had production problems with it. I can see that. I had some problems with the punch bit sticking in the cavity. I've experimented with different pellet modifications for about 50 years. Some work, some don't.

sicumj · « **Reply #13 on:** January 13, 2021, 08:56:35 AM »

If you have a drill press you can make a jig to hold the slug and use the drill press for an arbor press. For those who have a hard time being consistant with a hammer.

subscriber · « **Reply #14 on:** January 13, 2021, 10:40:22 AM »

Quote from: Motorhead on January 12, 2021, 09:12:40 PM

Just did @ 100 JSA .177 @ 12.5 grains using a "0" size jewelers Phillips tip.

Anything shot with those will be screwed

subscriber · « **Reply #15 on:** January 13, 2021, 10:45:50 AM »

Gripping the sharpened Philips bit in a drill press chuck and setting the limit stop would seem more to enable a more repeatable hollow point wall thinning, than tapping the bit with a hammer.

Imagine the die or mold HP core pin having that shape already. Calling Nick...

woogie_man · « **Reply #16 on:** January 13, 2021, 12:23:29 PM »

Ok thats awesome!!

Wonder how hard it would be to make some parts for a reloading press. Be easy to pump out modified ammo. Have a cup base to hold the slug, and a modified dye to be pushed into the slug. With the dye you would be able to accurately control the depth of the splits, instead if the " tap tap tap" method.

I do have a dye set that I use to modify .22lr shells and it works great. Wonder if I can find a tip to use in that.
Hmmmmm

Motorhead · « **Reply #17 on:** January 13, 2021, 01:05:58 PM »

Quote from: subscriber on January 13, 2021, 10:40:22 AM

Quote from: Motorhead on January 12, 2021, 09:12:40 PM
Just did @ 100 JSA .177 @ 12.5 grains using a "0" size jewelers Phillips tip.

Anything shot with those will be screwed

I see what ya did there ... clever

Motorhead · « **Reply #18 on:** January 13, 2021, 01:13:28 PM »

Quote from: sicumj on January 13, 2021, 08:56:35 AM

If you have a drill press you can make a jig to hold the slug and use the drill press for an arbor press. For those who have a hard time being consistant with a hammer.

LIGHT hammer .. I'm using this:

Weight just 4 ounces and can be purchased threw E-bay https://r.search.yahoo.com/_ylt=Awr9LtbsKf9fRYwALZuWnIlQ;_ylu=c2VjA2ZwLWF0dHJpYgRzbGsDcnVybA--/RV=2/RE=1610586732/RO=11/RU=http%3a%2f%2fwww.ebay.com%2fitm%2fJEWELERS-HAMMER-BRASS-AND-NYLON-HEAD-MALLET-METALSMITH-JEWELRY-MAKING-5-8-FACE-%2f200821409491/RK=2/RS=qJbP16un14LwCtVNbIpjRCFj_ow-

sicumj · « **Reply #19 on:** January 13, 2021, 03:20:53 PM »

Funny, I have that same hammer.

Getting a NSA .22 to open up better ... a LOT better !

Author Topic: Getting a NSA .22 to open up better ... a LOT better ! (Read 12175 times - 1 votes) )

Author Topic: Getting a NSA .22 to open up better ... a LOT better ! (Read 12175 times - 1 votes)
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