Original Remington 40-70

[Kurt]

The beauty of Arnies DDEPP bullet is you don't need to worry about setback or getting enough obturation to get full rotation with the alloy he uses. I would never have thought using his alloy for a PP bullet for the thought that it would not obturate enough to get full contact with the lands to seal the gasses or keep them from stripping like a straight shanked PP bullet would even patched to bore diameter. I looked at a lot of recovered PP bullets cast hard that had very bad gas cuts or stripping.
With the DDEPP and using Arnies high antimony alloyed bullet there is no setback and the reduced portion of the shank is unmarked from rifling cuts that I could see looking at 20 recovered bullets. They looked and measured before and after they were fired except for the expanded base that is groove diameter when patched.
Using these DD bullets you must match the patched shank diameter with the bore to keep the runout from starting.
The bullets below were shot using a .40-65 factory chamber and a .40-70 to try two different volumes of powder to see the effect of obturation.
The left bullet is unfired. When bullets look that good after leaving the muzzle and stopped in a snow bank they just have to get the job done.

IMG_3567.jpeg

Here is a BA .44 caliber PP mould I converted to a DD and it shoots very well in my .44-77 Shiloh and the Shiloh .44-100 rem St.
You get the shank patched snug to the bore and they will work and look like this when they go down range.

Kurt

IMG_3739 2.jpeg

[labop]

Thanks Arnie
We're going to try the DDEPP first in 16-1 alloy.

[beltfed]

Labop
Will look forward to your results both with as cast and also shortened.
Just need to be sure to use paper such that you will have the base band
"patch to FF case I.D." and the body "patched to bore ride"
beltfed/arnie

[mdeland]

Kurt, on the lower bullet how far up did the patch go on the body?

[Kurt]

Mike,
The dimple is the start of the ogive and that is where I hold the patch.

[labop]

I have tried one batch of hard alloy DDEPP the BA 403415E. In my 40-65 or 40-82 did they did not shoot as well as 16-1. That would be 1.5 moa compared to 3 moa.This was 2 parts SOWW with 1 part linotype which came in at HB14 after 3 weeks. I can't get many COWW around here so I hesitate to do much experimenting there and the alloy isn't very consistent in my opinion. Has anyone tried Tara Corp Mag alloy? Some places call it hardball alloy, 92 lead, 6 antimony with 2 tin. It tests about HB15-16.
labop

[Kurt]

labop, sone days you have good days some days you have bad I wish I could get 1.5 MOA every time I shoot. Some times I get sub MOA and the next time out it will run 5 MOA with the same rifle and shoot the same loads that gave me 1.5 MOA.
I blame it on Henry the Gremlin that will follow me sometimes to the range and maybe old age
Just have fun when you get out even if it gets frustrating.

[beltfed]

Labop,
Some time ago I sent you some of my 9+1 COWW/lino alloy.
Makeup is est to be: 94.5% lead/ 4.5% Antimony/1% tin
At about 15bhn
It will be very similar to the Taracorp Mag/hardball alloy Have you tried it? Works very well for me with my DDEPP bullets
in my 40-65, 38-50, 45-70, 32-40RH, 32-40BM. "When I do my Part"
beltfed/arnie

[labop]

Arnie
The alloy I tried was very similar to your 9+1 COWW/Lino. What I called hard alloy in a previous post was 2 parts SOWW and 1 part Lino. That composition using the standard Lino mix of 92-12-4 comes out 94.4 lead, 4.2 Antimony and 1.3 Tin. I recorded a harness of 14.2 and a drop weight of 0.090” compared to 15.5 and 0.080” for your alloy. I cast some 403415E in some recycled Taracorp mag alloy which I tested previously at 15HB/0.085. This current batch of Taracorp mag is testing 15.1HB but has not aged 3 weeks. I have pure metals so I may try a composition with those. I know these hard alloys will shoot it just takes more tweaking for me.
labop