I'm in need of my very own .45-70-405 Mold for a 2003 vintage Marlin 1895. Off the shelf varieties can't come close to what I think I need. I've played with MM's design software & learned to understand the pro's & con's of the various parameters. I've taken measurements & need to share my data here to arrive at a design. Let me start with my basics:
Using Winchester cases only.
Winchester Rim Dia. = .063"-.065"
Case Len. =2.085"-2.095" [to accommodate 95% of my brass]
Groove dia =.459"-.460"
C.O.A.L. Max for Ejection = 2.59" [using partially seated test boolit]
My C.O.A.L. Max = 2.55"
Test Boolit for measurements = "Beartooth" Jr. Piledriver, .460" D w/.450" Nose, 80% Meplat, Tang. Ogive profile
Leade ends, Throat taper begins @ 2.235" C.O.A.L. [using a reverse seated, gas chk'd test boolit]
Leade Length = 2.235"-2.085" 'Slug' Case Len =.150"
Wanted to 'see' what room there is for a projectile within the breech so I chambered a test boolit with hard foam & measured its position with a dowel, just short of the muzzle; then chambered a dummy rnd with my test boolit = 2.54" C.O.A.L. There was a .050" difference between the two, representing what I envision as "jump". It would seem I probably can't eliminate much of this with the 2.55" Max C.O.A.L. I've sorta established.
Pls. feel free to PM me with any comments & suggestions.
- Preliminary Design #1
- 2014-12-26 45-70 Design Data Sht1 (Copy).JPG (117.69 KiB) Viewed 4881 times
- "Beartooth" Test Boolit
- 'Beartooth' Jr Piledriver 1'03x460 w 450 Nose (Copy).JPG (12.6 KiB) Viewed 4881 times