Lyman 311644 , 190 grs.

KHornet

Well-Known Member
Bought that mold when it first came out. While it is an odd looking
duck, the only other mold that is as accurate in my 30's is 311299.
Never had a problem casting it.

Paul
 

fiver

Well-Known Member
they give the land impressions a place to move the lead.
if you check out Brad's 43-258 thread we have been discussing the amount of lead moved by the rifling and the bore squish under direct pressure from the powder burn.

for a couple of pages we kick around alloy, and design strength, then get into the paradox effect.
there is some real great ideas and some food for thought in that thread.
it should be a sticky.
 

Ben

Moderator
Staff member
Is any lube put in the upper voids? What are they for?

Kevin, the photo is a bit blurry, but I think it answers your question.

Ben


XmKZzrI.jpg
 

quicksylver

Well-Known Member
BTW....I see there are both types of 311644 for sale on E-bay right now ...ones with the upper grooves and one W/O....OR I have the numbers wrong....:)
 

Ian

Notorious member
I always figured the grooves in the nose give the nose the ability to be slightly oversized for a firm, centered fit in the lands, while not jamming hard and being tough to extract. This would probably benefit auto-loaders like the M1 and M1A quite a bit without having to be so precise in the alloy and nose shape department in order to find alignment at the end of a loose, oblique jump. The other advantage that jumps out at me is that the reduced surface area and ease of manually engraving the nose will work in the reverse when extracting live ammunition intact, and also fit a variety of slightly different bore diameters easily without jamming too hard in the tight ones.