Expander plug

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I am trying to order an expander plug for a 444 marlin projectile sized to 0.430″

The problem is that the order details mean nothing to me.

eg .436 x .432 Exp. Plug

If I guess that the dimensions are in inches I still have no idea what they refer to.

Diameters, lengths or whatever.

Even on reading forums where people recommend dies for certain bullets – I still do not understand what the numbers mean.

I do not even know if I need to buy a expander given that I have a Hornady die set that has an expander.

I hope someone might help clarify.

 

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[adamsutherlandModerator]

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I like somewhere ‘tween 1-2 thou neck tension for most of my applications, more and you run the risk of sizing down the bullet ‘pon seating.

Yes you do have to be cognisant of springback however only you with you particular brass can have a view on that, I like my case mouths to be slightly towards the “brittle” rather than soft, it is not so much the actual spring back but the same spring back on all brass, as in all things handloading it is consistency in all things that we seek.

[Author]

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