ASSRA Forum - 50-70 to 45 neck forming help

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50-70 to 45 neck forming help (Read 206 times)

MerwinBray Oldtimer Offline Aw Gees Posts: 951 Location: Kansas City, KS Joined: Apr 17^th, 2004	50-70 to 45 neck forming help Oct 18^th, 2026 at 12:02pm	Print Post
	I need to form some 50-70 brass to accept a .455ish projectile. My 45-70 dies don’t have a large enough opening to start a 50 case. Does anyone have experience or recommendations on how I should go about this? I’m basically making a 45 Peabody case. Or hoping to, at least.

	Great Plains Precision Rifle Club
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oneatatime Frequent Elocutionist Offline Posts: 4573 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: 50-70 to 45 neck forming help Reply #1 - yesterday at 1:42am	Print Post
	I make my 500-450 #2 from 50-90 brass with very little effort just easing it in stages into the sizing die using Imperial Wax.


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Jaybird4 Participating Member Offline Posts: 16 Joined: Sep 13^th, 2026	Re: 50-70 to 45 neck forming help Reply #2 - yesterday at 7:47am	Print Post
	Maybe a 577/450 Martini die with some of it cut off


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bullshop Senior Forum Member Offline Posts: 463 Joined: Sep 14^th, 2017	Re: 50-70 to 45 neck forming help Reply #3 - yesterday at 9:18am	Print Post
	I use Mag-Tech 32 gauge hulls to make both 50-70 and 43 Egyptian. I load .451" bullets in the 43 Egyptian. After first annealing I trim the brass to length for the 43 using a 50-70 file trim die adjusted to correct length. That also starts the first neck step down from 32 gauge. Then an RCBS FL die for 43 Egyptian is used in steps to the FL sizing of the case. What I end up with must be similar to what you need because as stated I am loading 45 caliber bullets in the 43 Egyptian. 43 Bowmont dies should also work since 43 Egyptian cartridges can be fired in 43 Bowmont rifles .


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MerwinBray Oldtimer Offline Aw Gees Posts: 951 Location: Kansas City, KS Joined: Apr 17^th, 2004	Re: 50-70 to 45 neck forming help Reply #4 - yesterday at 10:52pm	Print Post
	This is great information and appreciated. I know I have a little more research and measuring to do. And now, probably should get a set of close bottleneck dies. I could use 43 Spanish dies for a couple of rolling blocks. I wonder if I would over work the brass by squeezing it down to 43, then back out to 45?

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MerwinBray Oldtimer Offline Aw Gees Posts: 951 Location: Kansas City, KS Joined: Apr 17^th, 2004	Re: 50-70 to 45 neck forming help Reply #5 - yesterday at 10:54pm	Print Post
	I could also use the 577-450, but, darn, they are pricey and I don’t have a press with the larger hole.

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bullshop Senior Forum Member Offline Posts: 463 Joined: Sep 14^th, 2017	Re: 50-70 to 45 neck forming help Reply #6 - Today at 1:21pm	Print Post
	I dont know if they still do but for sure the older RCBS Rock Chucker is bored and threaded for 1 1/4 x 20 then bushed to 7/8x14. Remove the bushing and you can use the large diameter 1 1/4x 20 Lee dies.


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