Chamber cast or impact slug?

I was wondering if making an impact slug of a rifles throat is a better/worse method of measuring throat diameter etc., as opposed to just making a Cerrosafe chamber casting? I know that I have to wait 1 hour before measuring the casting and that after 1 month it expands quite a bit..any opinions as to which method is best?

If you are going to send the upset slug to the mold maker to ensure proper fit, LBT and others seem to prefer the upset pure lead slug, because "what you see is what you get" and it is constant.

pound slug.
make a couple of them you'll know which one to use.
and don't forget some type of lube I like lanolin.

it's all an educated guess,,,, till the trigger is pulled.

the more i find out about shootin boolits, the more it contradicts everything i ever learned about shooting jaxketed.

If you know how to use it the Cerrosafe will work fine. I use it all the time. I also have ponded slugs in and they work ok too. Have tried both with the same chamber and got the same results with Cerrosafe a whole lot easier.

Larry Gibson

If you know how to use it the Cerrosafe will work fine. I use it all the time. I also have ponded slugs in and they work ok too. Have tried both with the same chamber and got the same results with Cerrosafe a whole lot easier.

Larry Gibson

I agree.

NRA Endowment member, TSRA Life member, Distinguished Rifleman, Viet Nam Vet

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Abbreviations used in Reloading
Pointed Soft Point "Core Lokt"

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