Pic of a Gas Check and Bullets with gas checks on them.

Can't help with your specific question.

It has been at least 29 years since I reloaded. Hand Gun 45 acp, 9mm, 38 special, .357 magnum . Rifle 30-06 and all for economey.

I also have a .357 Rifle magnum (Rossi copy of a Whinchester 92 lever action) Just have cheap Lee C-press and most Lee other stuff but have soem Hornaday.

Where I could I used carbide dies so that I did not have to lube the cases.

The only Bullet casting I have done was for a .36 cal Italian made copy of a Colt Navy cap and Ball Relover made by Hawes. Sold one of the times when I was out of work at a Garage Sale.

I learned something about casting from that. I was using an iron pan on the stove to melt the lead. Several Months later I found that some of the Bullets had what appeard to be inclusions in the lead.
What I found out later was that they were not inclusions but were actually lead crystals caused by me getting the lead too hot. Why people that are serious about casting use a temp controlled melter.

But, for some reason I kept the Powder Flask.

I was not on the internet back then around 1995 shopping was limited. Bought cast handgun Bullets at Gun Shows when there was more of them around and Primers and 30-06 Bullets from Midwayusa or if they were on sale at the local sporting goods.

When I read Gun magazines in the late 1950s or early 1960s they mentioned that Gas Checks decreased barrel leading and also Gas Checks back then were simple pan shaped.
Back then you also read that Gas Checks would occasionaly come loose in bullet flight and rarely some how left in the barrel.
I am assuming that equipment for installing them and casting bullets has improved so that does not happen now.

Since that time in particular the upper inner edge of them on some have changed to be thicker on the inner upper edge so as to bit in better when they are crimped.

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