Cavity dimensions for 457122 HP ?

[Elric]

Mulling over putting a Marlin 1895 45-70 back to work, one mould that I have is the venerable 457122. I heartily dislike the Lyman HP pin as it takes opposable thumbs. Looking at Erik Ohlen's "Hollow Point Bullet Mold Service " and have him do a Inset-Bar hollow point conversion with the Inset-Bar Extractor linkage option. I did look at MP Molds, but his molds are brass or aluminum...

This will be for deer hunting, maybe 1200 fps, terminal distance maybe 150 yds...

Any preferences for HP pin dimensions?

http://www.castpics.net/subsite2/ByCaliber/The%20457122.pdf

.140 diameter, .375 to .450 deep.

 

[Walks]

I never had a Problem with the Lyman HP molds. I guess when you grow up using them and know nothing else, they seem easy.
Didn't see a Cramer until I was in High School. By that time all Hunting bullets above .22 Rimfire in Calif had to be jacketed.

Still have a couple, that #457122 & a #358429. The 1st was used in a Marlin 1895SS with Full Length Mag tube for "Log Splitting" at Cowboy Shooting SideMatches. Really blew big chunks out of a 6" "Log".

The #358429, I've just had forever. It was great at Jackrabbits with .38-44 Loads in a Post-War Colt OP.
Did a number on Coyotes too.

 

[Outpost75]

A cavity geometry which has worked well for me in the .44-40, .45 Colt and .455 is a core pin having a major diameter 0.66 of the meplat diameter, with depth twice its diameter, having an end radius 1/4 of the major diameter, with an eliptical draft, as if you inserted a .22 LR bullet into a piece of beeswax, pushed it in to the start of knurling and then pulled it out. This expands down to 800 fps in 1:40 alloy and will hold together and expand nicely at full black powder velocity in 1:20 alloy. USE NO ANTIMONY to ensure that the expanded "mushroom" does not fracture away from the base. Above 1400 fps, instead of the eliptical cavity, simply use a 30 degree draft angle from the .66 of meplat diameter down to a sharp point, which gives you a strong cup-point twice as deep as its diameter, but which will stand high velocity.

 

[CWLONGSHOT]

I have two of these molds and the hp holes are different. Basically its 1/8”x3/8”

but looking at both one is slightly larger and looking at pins one slightly longer (deeper)

 

[358156 hp]

OP75s post kind of makes me want one for my SOCOM.

 

[Chris Stephenson]

I have one of these moulds and was never able to get decent accuracy out of it in either my 45-70 or SOCOM. I'm watching for your results. If you strike on a good load, please post the specifics.
Chris

 

[StrawHat]

I used 457122 over blackpowder, when i still used the 45-70, and had good results with the factory pin. Lead was 20/1 or a bit softer.

Kevin