Screws for gas checks?

[destrux]

Has anyone here experimented with the old lyman screw base molds? Looks like an interesting idea. They cast a bullet with a hole in the bottom for a screw to go into.

[skeettx]

What would the mould number be???

Please tell me more as this is a new one on me!

Any other articles? Photos? Anything?

Thank you
Mike

[gwpercle]

The screw holds the gas check on, or is the screw the gas check ?

[longbow]

I have never seen such a mould. I would also be interested to know the mould number is and see some photos.

I have seen the Harvey Protex zinc gas checks, pour through gas checks, washers set in grooves to make scraping rings, wire wrapping, rivet on copper disks and maybe some others but never a screw.

Longbow

[destrux]

I have the info at home, it's talked about in the Lyman #47 manual in the section where they explain the Lyman mold numbering system. The molds aren't pictured, but what I gather is they are designed like a hollow base mold, except the hollow base plug is shaped like a screw without threads. After casting you simply screw a wood screw into the base of the bullet and it acts as a gas check.

[mongoose33]

I'm having a hard time believing that a STEEL screw would be the kind of thing I'd want scraping down my bore.....

[imashooter2]

Screws come in brass as well as steel.

I would think brass screws would cost considerably more than checks and finding the right head diameter would be a stretch...

[SSGOldfart]

My brother used to do that,he also used a mold where he inserted the screws before casting. If memory serves me,he once told me to not use a stainless steel screws,I think he ruined a camber once with a screw so I stayed clear of that Ideal myself
I'll stick with gas checks for now most of my casting is plain base boolits any how

[bangerjim]

That is a new one on me! Why bother with the added expense, time, weight, and general "what the he##"? That screw would sure mess up the dynamic balance of a boolit!!!

I cannot imagine anyone wasting time doing that when GC's are so simple to put on!

Pictures and data are definitely required on this "screwed-up" boolit!!!!!!!

banger

[clum553946]

Maybe they used them for "reverse groups" to see who can get the largest groups at 15 yards! Lol (I must be getting tired!)

[Dan Cash]

Dr. franklin Mann experimented with this system back in the late 1800 to early 1900s with reasonable success. It demonstrated for him that the more perfect the bullet base, the better the group. Get and read the "Bullet's Flight...".

[Hickory]

I guess there is no limit to the things people think of.

[Hickok]

I wouldn't use them hunting, because I don't want my deer meat "screwed up!"

[JSnover]

I can hear the new myth being spread already: "Don't shoot them screw-base lead bullets in a rifled barrel, you'll cross-thread yer bore!"

[brstevns]

Cannot shoot a right hand twist screw in a left hand twist barrel.

[JSnover]

Even if they were both RH, the thread pitch on that screw isn't anywhere near my barrel twist. Either way it's a recipe for certain disaster!

[Nueces]

"You'll screw yer eye out, kid."

[xacex]

This is screwed up.

[MT Gianni]

I have the info at home, it's talked about in the Lyman #47 manual in the section where they explain the Lyman mold numbering system. The molds aren't pictured, but what I gather is they are designed like a hollow base mold, except the hollow base plug is shaped like a screw without threads. After casting you simply screw a wood screw into the base of the bullet and it acts as a gas check.

Do you have a page reference? I don't remember it in #47.

[xacex]

Do you have a page reference? I don't remember it in #47.

I have one here,but looking through the casting section that had the molds listed I am not finding it. Section 4?