Hydraulic pressure on the Star can break boolits!

[6bg6ga]

common design for a number of different uses.

[gtgeorge]

And a grease gun has a rubber seal that stays tight against the bore to push the grease as well.

[M-Tecs]

For the people that want to do the math.

http://www.glasscampus.com/tutorials/pdf/Stretching%20Lead.pdf

http://www.eng-tips.com/viewthread.cfm?qid=180873

http://www.glasscampus.com/tutorials/pdf/Stretching%20Lead.pdf

http://mysite.du.edu/~jcalvert/phys/lead.htm

http://www.ila-lead.org/UserFiles/File/factbook/chapter2.pdf

[ssnow]

Do you know how to tighten the tracks on a Bulldozer? A grease gun

[longbow]

Slightly off topic but I am with cbrick on the thin stem collapsing under high firing pressure. I do not like any of the designs with extremely deep lube grooves/small stems for that reason

I can state for a fact the a Lyman 429421 can collapse at the lube groove under the compression of a top end powder charge because I have recovered boolits that collapsed at the lube groove. These were cast of range scrap and air cooled. They seemed slightly softer than ACWW but not hardness tested.

Tim: Since you will not be checking hydraulic pressure of flowing lube the distance the gauge is from the piston doesn't matter. Once pressure is built up it is static pressure so makes no difference as to distance.

As for lead tensile and compressive strength, I believe lead like most ductile materials has about equal tensile and compressive strength but I will check to see if I can find some back up. Lea dis an odd one because it creeps so badly that tensile strength is hard to measure accurately... at least with near pure lead.

Longbow