40-70 Dedicated PP Chamber

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Coltsmoke
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40-70 Dedicated PP Chamber

Post by Coltsmoke » Sun Sep 19, 2021 4:38 pm

A friend of mine has purchased a rifle in 40-70 with a PP chamber. What die do you use to size the new brass so you can get it in the chamber to be fireformed?
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bpcr shooter
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Re: 40-70 Dedicated PP Chamber

Post by bpcr shooter » Mon Sep 20, 2021 5:43 am

FL should work just fine. if its smaller than that your going to need a custom die set.
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powderburner
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Re: 40-70 Dedicated PP Chamber

Post by powderburner » Mon Sep 20, 2021 7:20 am

All my tight chambers will take a full length sized case.
But you wont need any dies after only maybe a taper crimp die. None of mine change shape after firing. Of course this does depend on the chamber and your bullet.
My bullet moulds are cut to slip a patched bullet into snuglt.
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Coltsmoke
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Re: 40-70 Dedicated PP Chamber

Post by Coltsmoke » Mon Sep 20, 2021 7:40 am

We are talking more than just a tight chamber, it is cut just for a PP bullet, no way to use a .459 GG bullet.
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MSalyards
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Re: 40-70 Dedicated PP Chamber

Post by MSalyards » Mon Sep 20, 2021 7:54 am

I would think it would be impossible put a .459 bullet in a 40/70, might try a .408

Kenny Wasserburger
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Re: 40-70 Dedicated PP Chamber

Post by Kenny Wasserburger » Mon Sep 20, 2021 7:56 am

Colt,

I don’t believe a .459 bullet will fit in any 40-70 chamber no mater what it is cut for.

You got a number wrong in either your first post or your second.

KW
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Coltsmoke
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Re: 40-70 Dedicated PP Chamber

Post by Coltsmoke » Mon Sep 20, 2021 8:00 am

I made a mistake, it is a .40. I should have said a .408.
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kenny sd
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Re: 40-70 Dedicated PP Chamber

Post by kenny sd » Mon Sep 20, 2021 8:15 am

I have a Shiloh 40 70 ss and the 40 by Shiloh is .408. I trim to 2.495 to avoid any overlap, and never have to size the cases.
I load PP but found that GG and NO cleaning for a 5 shot group is better. I use a VERY light factory crimp to hold the bullet.
65 Swiss 1 1/2 weighed, one card 060, two newspaper wads over that and die seat.
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powderburner
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Re: 40-70 Dedicated PP Chamber

Post by powderburner » Mon Sep 20, 2021 8:28 am

None of my rifles will chamber a grease groove bullet. They stop about 1/2 way.
All my brass has been formed with rcbs dies or redding. No customs.
You dont need to expand the necks to seat a bullet.
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bobw
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Re: 40-70 Dedicated PP Chamber

Post by bobw » Thu Sep 23, 2021 5:01 am

Rcbs as well as Lyman full length sizing dies will usually squeeze new cases down enough for fire forming new brass the 1st time. In my original style 40-90 SBN chamber full length sized wasn't quite enough for the reformed 2.6 starline needed a little squeezing with a 40 sw tungsten sizer for the fireform load. Once they are fireformed your good to go, oil up your sizer die and put it away.
bobw

bobw
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Re: 40-70 Dedicated PP Chamber

Post by bobw » Thu Sep 23, 2021 5:01 am

Rcbs as well as Lyman full length sizing dies will usually squeeze new cases down enough for fire forming new brass the 1st time. In my original style 40-90 SBN chamber full length sized wasn't quite enough for the reformed 2.6 starline needed a little squeezing with a 40 sw tungsten sizer for the fireform load. Once they are fireformed your good yo go, oil up your sizer die and put it away.
bobw

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