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Offline Westbound

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45-70 rechamber questions
« on: January 31, 2009, 06:13:29 AM »
If a 45-70 barrel is reamed out to 45-90, 110, or 120, would it be able to shoot shorter rounds, i.e a 45-70 round from a 45-120???
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Offline petemi

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Re: 45-70 rechamber questions
« Reply #1 on: January 31, 2009, 06:15:54 AM »
Yes, with fouling and leading in the chamber.

Pete
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Offline Westbound

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Re: 45-70 rechamber questions
« Reply #2 on: January 31, 2009, 06:21:17 AM »
That sounds like a pain in the butt!

My BC is a good shooter and way too new to want to modify.
Maybe I'll just wait until my wife forgets that I bought this one and get another later to ream.
I am, though, completely infatuated with this 45-120 and its legendary performance  :D
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Offline BBF

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Re: 45-70 rechamber questions
« Reply #3 on: January 31, 2009, 10:18:56 AM »
  W h a t !!
You don't get pushed around enough from a full load 45-70?
You want more pain? ::) ;D
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Offline tykempster

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Re: 45-70 rechamber questions
« Reply #4 on: January 31, 2009, 01:10:27 PM »
The legend grows... ;D
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Offline Swampman

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Re: 45-70 rechamber questions
« Reply #5 on: January 31, 2009, 02:17:00 PM »
Quote from: petemi on January 31, 2009, 06:15:54 AM
Yes, with fouling and leading in the chamber.

Pete

Nothing a brush and some #9 won't remove.

Anyting above the .45-90 is a waste of time unless you are using black powder IMO.
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Offline Smokin Joe

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Re: 45-70 rechamber questions
« Reply #6 on: January 31, 2009, 04:05:26 PM »
I have a .45-90 rechamber and the .45-70's work just fine in it. The trick is to seat the bullets long to take up the extra space (.30").
 I don't think you can get away with this in anything longer...it's not too bad with jacketed, but it can be a pain with cast slugs. The chamber fouling means nothing; clean it as you normally would.
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Offline tykempster

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Re: 45-70 rechamber questions
« Reply #7 on: February 01, 2009, 03:20:35 AM »
Quote
Anyting above the .45-90 is a waste of time unless you are using black powder IMO.

WHAT!

Tell me how a 45-90 can get 458 Lott ballistics...
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Offline Swampman

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Re: 45-70 rechamber questions
« Reply #8 on: February 01, 2009, 03:54:37 AM »
Not without damaging the frame.
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Offline Spanky

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Re: 45-70 rechamber questions
« Reply #9 on: February 01, 2009, 08:05:07 AM »
Quote from: tykempster on February 01, 2009, 03:20:35 AM
Quote
Anyting above the .45-90 is a waste of time unless you are using black powder IMO.

WHAT!

Tell me how a 45-90 can get 458 Lott ballistics...
Quote from: Swampman on February 01, 2009, 03:54:37 AM
Not without damaging the frame.


And then the fight started... :D



Spanky
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Offline Smokin Joe

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Re: 45-70 rechamber questions
« Reply #10 on: February 01, 2009, 09:09:11 AM »
.
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Offline quickdtoo

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Re: 45-70 rechamber questions
« Reply #11 on: February 01, 2009, 12:34:47 PM »
I seriously think there would be damage to the underlug long before the frame showed signs of damage if the shooter is working loads up slowly as Tyler did. The 458 Lott operates at 54kpsi according to A-Square and the case holds less that 100gr water compared to 125gr water for Tyler's 45-120, holding pressures to ~40kpsi the 45-120 can produce Lott velocities in a 32" barrel with less pressure due to the larger case, the lott has a case head of .513" and is 2.8" long, the 45-120 is .506" and 3.25" long. The Lott velocity would be in a shorter barrel too, likely 24".

Tim
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Offline bajabill

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Re: 45-70 rechamber questions
« Reply #12 on: February 02, 2009, 04:14:51 AM »
I keep revisiting the 45-something bigger than 70   every 6 months or so, and keep putting it back on the idea shelf for some reason.  I guess that since I really only shoot 300gr pills and have not yet maxed out the 45-70, I cant bring myself to do this project yet.  For me, I would probably only push the chamber to 45-90.  Now, on another topic, the 445sm has more appeal to me, except why do I need a 45-70 wannabe  :o
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Offline quickdtoo

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Re: 45-70 rechamber questions
« Reply #13 on: February 02, 2009, 12:33:46 PM »
Quote from: Swampman on February 01, 2009, 03:54:37 AM
Not without damaging the frame.

Most of the oldtimers here will recall the fella with the 243 Superlight that unknowingly had one of his "friends" load it with a 7.62x39 round and fired it whilst he was he was at the range shooting, needless to say it ruined their day, but it didn't ruin the frame, locked it up so he couldn't open the action, he sent it to H&R, it had ruined the barrel, they replaced the barrel and returned it to him, I suspect they replaced the latch pin also since it's the weak link in the frame. I just ran the figures thru QuickLoad to see what kind of pressure it predicted, I got 126,863psi for those doubting the strength of a modern SB2 frame.  ;)

Tim

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Offline tykempster

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Re: 45-70 rechamber questions
« Reply #14 on: February 02, 2009, 01:08:56 PM »
My fired case capacity is 132 grains BTW.

I bet even with a 24" barrel I could stomp the 458 Lott.  But we won't go there...

And the 500 S&W is a larger case head AND much higher pressure.  If we want to up the ante to 50k in the 45-120 it would be all over most other .458 cartridges.
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Offline tykempster

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Re: 45-70 rechamber questions
« Reply #15 on: February 02, 2009, 01:09:52 PM »
I don't shoot 50k loads however...

I will ream the throat out and see how fast I can get the bigger bullets moving at 40k though.
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Offline AtlLaw

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Re: 45-70 rechamber questions
« Reply #16 on: February 02, 2009, 02:02:32 PM »
Quote from: tykempster on February 02, 2009, 01:09:52 PM
I will ream the throat out and see how fast I can get the bigger bullets moving at 40k though.

Tyler, I finished my reaming and throating.  The extension worked like a charm for the 45-120 throat!   ;D  I'll mail it to you this week.
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Offline LONGTOM

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Re: 45-70 rechamber questions
« Reply #17 on: February 02, 2009, 02:54:40 PM »
Quote from: tykempster on February 02, 2009, 01:09:52 PM
I don't shoot 50k loads however...

I will ream the throat out and see how fast I can get the bigger bullets moving at 40k though.

All for the sake of our knowledge!
TYKE be carefull as I know you will be.
We don't need to know that bad!


LONGTOM
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Offline AtlLaw

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Re: 45-70 rechamber questions
« Reply #18 on: February 02, 2009, 03:03:09 PM »
HUSH FRANK!  Don't discourage the boy!  Tyler's my personal pressure tester!   :D

Just kidding of course.  In talking to him I've come to know that he is a very level headed young man and he won't let his youthfull exuberance override his good judgement.  Will you Tyler?!  TYLER!!  Don't make me come over there! !   :D
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Richard
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Offline LONGTOM

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Re: 45-70 rechamber questions
« Reply #19 on: February 02, 2009, 03:06:19 PM »
You know him better than I do!


LONGTOM
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Offline Smokin Joe

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Re: 45-70 rechamber questions
« Reply #20 on: February 02, 2009, 03:15:37 PM »
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Offline tykempster

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Re: 45-70 rechamber questions
« Reply #21 on: February 02, 2009, 03:19:05 PM »
I WILL be 100% safe.  I plan on firing more 720 grain bullets, maybe they will stabilize with a tad more speed.  1800 gps should be pretty easy to achieve with them seated waaaay out as in my picture.
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Offline Spanky

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Re: 45-70 rechamber questions
« Reply #22 on: February 02, 2009, 03:25:48 PM »
Quote from: tykempster on February 02, 2009, 03:19:05 PM
I WILL be 100% safe.  I plan on firing more 720 grain bullets, maybe they will stabilize with a tad more speed.  1800 gps should be pretty easy to achieve with them seated waaaay out as in my picture.


Tyler,

I gotta give you alot of credit.
You seem to do your homework (no school puns intended) when it comes to loading.
Alot of guys your age would just spray and pray without concern for safety and end up blowing something up.
You take your time and calculate things first.
Good on ya! ;D
Don't kid yourself either... alot of the old guys on here are learning a thing or two from you. ;)
Keep up the good work Ty.


Spanky
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