Author Topic: NSA slug modification ... easy peezy & effective too ! (Read 253 times)

Motorhead · « **on:** January 12, 2021, 04:45:15 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.

LAST PICTURE ... just did @ 100 in .177 cal 12.5 grain using a Jewelers "0" size blade tip. No mod needed to the blade being already thin it made a near perfect X

Steelhead · « **Reply #1 on:** January 12, 2021, 05:58:39 PM »

That is freaking awesome. It says a lot about what I'm seeing the Hades pellets do to pests with the pellet pattern being somewhat similar. That's a great tip. Thank you very much and I will applying it to some NSA slugs.

steveoh · « **Reply #2 on:** January 12, 2021, 06:51:23 PM »

Oh my, this is great!

Hmmmm, .257 hollow point slugs might just have to get the treatment.

rsterne · « **Reply #3 on:** January 12, 2021, 08:40:44 PM »

How do you control the depth the "X-tool" goes when tapped into the HP of the slug, and what keeps the tool straight on the axis of the slug?.... I had a 2-part die (the parts slid together for alignment) for "upsizing" .30 cal pellets to .308 cal, but the die had a positive stop (adjustable) so that every pellet came out the same length and diameter, regardless of how hard you tapped on it.... Consistency will be important to accuracy, I would think....

Bob

steveoh · « **Reply #4 on:** January 13, 2021, 12:05:38 AM »

I think I pushed remove button accidentally.

I was able to save the content and images using browser back button. steveoh

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here a quick shoot of the modified .177 12.5's Shot at @ 20 yards into a water jug ( @ 1020 FPS )

Bob, at this juncture it is all by feel just playing with the concept / idea. results are unarguable it does create fracture lines and the NSA is far more willing to open up.

A small alignment thimble made of clear plexi with a stop could be made fairly easy.

Just screwing around and sharing

Alan · « **Reply #5 on:** January 13, 2021, 04:39:07 AM »

If you want a better test of mushrooming, here's a tip.

Buy some J-lube. Follow the directions, and make a heavy batch. A gallon (milk) jug of water will take about 1/2 cup of J-lube. You'll end up with a consistency like that of a can of spray slime, for just pennies. At about 10 feet, a 26.8 grain NSA slug with 52 FPE being it, won't go through the jug, and will be about 3/8" in diameter.

rsterne · « **Reply #6 on:** January 13, 2021, 11:03:58 AM »

I get that, Scott.... and thanks for sharing your results.... A sleeve should work fine to hold the X-tool and slug in alignment and provide a positive stop for the tool....

Bob

Motorhead · « **Reply #7 on:** January 13, 2021, 11:41:21 AM »

More testing ...

Using the "0" size jewelers phillips it has thinner edges already and far more symmetrical than a reground #2 tip and self centers far better as well.
Same Tap tap tap with the light hammer has the X being IMO very consistent with some practice.

Todays test was using the .22 cal NSA in the 24.8 grain weight which has a known deeper HP pocket. still keeping the X inside the meplat.
Test again into a water jug @ 20 yards shot at @ 940fps. Unmodified slug passed right threw the jug

modified opened up to .460" being over DOUBLE the caliber diameter ... Wowzer

Scott S

Alan · « **Reply #8 on:** January 13, 2021, 11:57:13 AM »

Why not use a drill press with an adjustable plunge?

steveoh · « **Reply #9 on:** January 13, 2021, 12:00:15 PM »

For those of us who cast our own, I wonder if http://www.hollowpointmold.com would machine pins that have such a shape?

Another thought would be to modify a sizing press with an adjustable holder for a bit to help with mass production of such hollow points.

Motorhead · « **Reply #10 on:** January 13, 2021, 12:30:40 PM »

Quote from: Alan on January 13, 2021, 11:57:13 AM

Why not use a drill press with an adjustable plunge?

play with the idea and come up with what works best for you.
Using the "0" jewelers phillips it self centers excellent and with some practice hit effort with the light hammer and holding it square for me is working just fine.

* Being the slug sticks to the tip, a simple twist on driver shank tells you how square and true you doing it. The run out has been so close to perfect I'm not sweating it until i hit some vermin with em in a few months.

Loren · « **Reply #11 on:** January 13, 2021, 06:53:19 PM »

Quote from: steveoh on January 13, 2021, 12:00:15 PM

For those of us who cast our own, I wonder if http://www.hollowpointmold.com would machine pins that have such a shape?

Another thought would be to modify a sizing press with an adjustable holder for a bit to help with mass production of such hollow points.

Looks like he would