Powder coating & Gas checks ?

  • Last Post 10 May 2021
LarryW posted this 07 May 2021

Howdy everyone, Since I am about to start my powder coating adventure along with

my Gas check adventure, both plain base & gas chex shanked boolits, my question

is. Apply checks before, or after powder coating ?

Thanks in advance.. Take care & be safe..

A day late & a dollar short, story of my life ???

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JeffinNZ posted this 07 May 2021

I apply before coating simply because trying to seat the gas check afterwards is more difficult especially in .22 bullets.

Cheers from New Zealand

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pisco posted this 07 May 2021

I seat the g/c after I p/c

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Boschloper posted this 08 May 2021

I'm shooting 358156 at .38 spl +p all the way up to full .357 mag. velocity with powder coat and no gas check.

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Spindrift posted this 08 May 2021

I seat GC prior to coating. If you find you have under-sized shanks, it would make sense to coat before seating checks. But most shanks have a rather generous girth in the first place. Some general observations I have made, with coated bullets in bottle-neck rifle cartridges:

- coated, GC bullets often shoot well with starting loads for jacketed bullets, using the faster of the listed powders. Sometimes slightly reduced.


- Coated PB bullets often shoot well with loads similar to what you would use with a lubed, GC bullet of the same construction. 


- Bullets designed for GC often shoot well without GC (bare shank) when coated. Particularily bullets with a reasonable bearing surface despite the absence of a GC


- Due to slight variability of coating thickness, don’t aim for «jam-fit» COL, unless you uniform the nose after coating with a swaging process. You’ll get some cartridges that’ll refuse to chamber. Use enough jump, to allow all cartridges to chamber without resistance. With a short jump  COL, some cartridges offer resistance when closing the bolt- and result in (often) a high flier. Use enough jump, the bullets can take it.


- Bore-riders that are well-fitting in the first place are unsuitable for coating. Generally, bullets with conical noses are best. 


You’ll find there is a little learing curve related to this technique,  but you’ll get the hang of it in a short while. Just be prepared for some frustrations in the beginning (I sure had).

Good luck, and happy shooting!

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4and1 posted this 08 May 2021

I seat the check and size the bullet, then PC. I run the bullet in the sizer after PC too, cause I'm using a tight fit chamber.

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358156hp posted this 09 May 2021

I use both methods on revolver bullets, primarily dependent on which gas checks I'm using. I always install  non-crimp (Lyman) style gas checks after tumbling the bullet in powder, but before baking. I find this allows the cured powder coating to secure the 'check on the step, kind of like gluing them on. For crimp on gas checks (Hornady) I can go either way since I have a gas check flaring tool set that covers all common sizes. I usually install and crimp these gas checks after coating.

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Ross Smith posted this 09 May 2021

I have to seat gc's first then powder coat then size for my 300 Blackout. Other wise I have case neck-throat dimension problems and the gun don't work.

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GP Idaho posted this 10 May 2021

LarryW: I almost always seat the checks and crimp them on with either a Noe bushing sizer or Lee push through size die the diameter that I want the bullet to finish. Then powder coat and run them through the sizer one more time for a smooth finish. As mentioned in a thread above, watch those nose sizes when powder coating, it can lead to chambering problems as you are changing the dimensions of the bullet slightly. If you have a bore rider that is a fit as it drops from your mould the nose will need sizing before or after coating but that's a whole different rabbit hole. Gp

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