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Slugged the 45-70 now for the questions

This is a discussion on Slugged the 45-70 now for the questions within the Reloading forums, part of the Firearm Forum category; So i slugged the barrel on the Henry 45-70 (octagon) I'm gettin .457.5 groove dia. i will cross check this with another measuring tool questions; ...


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Old March 15th, 2017, 07:26 PM   #1
 
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Slugged the 45-70 now for the questions

So i slugged the barrel on the Henry 45-70 (octagon) I'm gettin .457.5 groove dia.
i will cross check this with another measuring tool

questions;

Does this sound normal for a Henry?

If this measurement holds true then for lead i should use a projectile sized to .458 right?

If i use a gas checked projectile do i stay the same, size up, or size down?

I am planning on a 405gr at hopefully moderate speeds depending on what the riffle likes

i only load straight wall revolver rounds so this is a new area for me but i assume will be similar

thanks for any info or advice i will check back tomorrow later to see what i can learn

DAD45



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Old March 15th, 2017, 09:18 PM   #2
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If it is .457.5, I would lean towards .459 for cast lead bullets. Would also be fine for cast lead with gas checks. My Marlin LTD-V runs .458 and I size my cast lead 350 gr. RNFP bullets to .460 and I can not argue with 3 shot 100 yard groups of 1 inch.
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Old March 16th, 2017, 02:57 AM   #3
 
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Quote:
Originally Posted by HBK View Post
If it is .457.5, I would lean towards .459 for cast lead bullets. Would also be fine for cast lead with gas checks. My Marlin LTD-V runs .458 and I size my cast lead 350 gr. RNFP bullets to .460 and I can not argue with 3 shot 100 yard groups of 1 inch.
+1
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Old March 16th, 2017, 04:11 AM   #4
 
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I would also recommend .459 weather checked or not. And it is not necessary to check the 45-70 unless you are running ruger only loads. Your pressures are not high enough to cause leading. Also loading the 45-70 is no different then straight wall pistol except that the case will buckle easier if you try crimping them too much.
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Old March 16th, 2017, 04:51 AM   #5
 
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My GBL slugged at .4575 and I am running .459 bullets with a Brinell hardness of 18 right at 1650fps on a a chrony. There's a tiny bit of leading, but not bad. I use RCBS dies and 405 Grain Missouri Bullet co. Bullets. I give them a full turn crimp right into the groove.
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Old March 17th, 2017, 08:41 PM   #6
 
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Most 45-70's with Ballard type rifling like .002 over groove diameter with cast.
Interestingly enough, all three of my 45-70 rifles, '85 and '86 Winchester and
Henry, have .457 groove diameters. They all perform very well with cast bullets.
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