Author Topic: Drawback for Uberti Chamber  (Read 7106 times)

Offline King Medallion

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Drawback for Uberti Chamber
« on: November 26, 2014, 07:57:58 AM »
I have a line on a 45-75 that has the oversized Uberti Chamber. What are, if any drawbacks for the oversize chamber?
King Medallion

Offline larryo_1

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Re: Drawback for Uberti Chamber
« Reply #1 on: November 26, 2014, 08:42:34 AM »
As far as I am concerned, there are one.  It does give you the  option for a bit more BP (about 5-6 grains). I have had mine for several years wilth absolutely no problems.  The only thing is, you need to fire-form your brass but once done that is it.
When in doubt, mumble!
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Offline King Medallion

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Re: Drawback for Uberti Chamber
« Reply #2 on: November 26, 2014, 08:54:47 AM »
How about smokeless powders? Im not really a BP shooter. Any more special loadings?
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Re: Drawback for Uberti Chamber
« Reply #3 on: Today at 04:03:37 AM »

Offline larryo_1

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Re: Drawback for Uberti Chamber
« Reply #3 on: November 26, 2014, 10:31:03 AM »
Try 2400 at 24.0 grains--got that out of Ken Waters book.  I use also a tuft of kapok.  All under my Hoch custom 350 grain bullet cast at 16:1.  Works great for me and accurate also.
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Offline larryo_1

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Re: Drawback for Uberti Chamber
« Reply #4 on: November 26, 2014, 08:00:28 PM »
King Medallion:
I did some browsing in my data and in addition, I got a tighter group with 22.0 grains of 2400 and the kapok.  The other smokeless powders that i played with are:3031,4198, 4759 and 5744.  All worked pretty good and a person can only experiment with them and ther may beone that does best for you.  Hope this helps.
When in doubt, mumble!
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Offline King Medallion

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Re: Drawback for Uberti Chamber
« Reply #5 on: November 26, 2014, 09:19:06 PM »
Thanks Larry_1. Still waiting for response from seller. Has a CH4D 45-75 Uberti die set and box of 348 formed brass with the rifle for $1200. Sound like a good price?
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Offline larryo_1

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Re: Drawback for Uberti Chamber
« Reply #6 on: November 27, 2014, 08:13:54 AM »
I would think so considering I paid more than that for mine when I got it several years ago.
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Offline Tommy Reb

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Re: Drawback for Uberti Chamber
« Reply #7 on: November 27, 2014, 01:06:47 PM »
Hello King.  No problem at all with the "Uberti Chamber", as long as you have the proper CH4D dies.  Actually the larger chamber works out well for me since I use a 100 % load density with Surplus 4831 under 360 grain LBT bullets for hunting.  For Cody Dixon competition, I use MP5744 with the same bullets loaded to a nice mild 1050 fps.  I would suggest getting a Lee FCD to allow you to crimp anywhere you need to on the bullet to achieve optimum OAL.

Price sounds fair, assuming, of course the gun is in good shape.  As I recall I paid about that for mine with dies (CH4D and Lyman sets) and 75+ pieces of new Jamison brass.

TR
Tommy Reb

Offline larryo_1

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Re: Drawback for Uberti Chamber
« Reply #8 on: November 27, 2014, 02:32:55 PM »
Well here is some more of my data for you guys to think about.  I have a good load using the Old style 4831 to the amount of 60.0 grains.  I used a magnum primer to help get rid of the unburned powder grains and the brass was Jamison.  Again, the bullet that I use is a Custom Hoch bullet that weighs at 350 grains and is cast in an alloy of 16:1.  I got that formula off an original box of 45-75 ammo.  The velocity was chronographed at an average of 1542fps.  If you want to play with BP, the load that I have good luck with is Swiss1½ with a charge of 76.0 grains.  It does kick a bit!  As far as dies go--I cannot recommend enough that you get a Lee Factory crimp die AND an RCBS Trim and File die set for this chamber.  These cases do stretch just a tad and as fussy as these rifles are--correct OAL is a must.  Hope this helps and in passing, I pulled a bullet out an original 45-75 case today and measured the powder charge (Black of course) and lo and behold, it is a nice even 76.0 grains.  So my 76 grain loads are right in the ball park along with the boom and kick!  Have a great T-Day fellas...
When in doubt, mumble!
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Offline King Medallion

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Re: Drawback for Uberti Chamber
« Reply #9 on: November 27, 2014, 03:01:56 PM »
Thanks fella's, if and when the seller gets back to me, I think I'll buy it.
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Offline King Medallion

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Re: Drawback for Uberti Chamber
« Reply #10 on: December 08, 2014, 05:56:23 PM »
I bought the rifle and also ordered a Lee FCD. Now the wait. :P
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Offline Silver_Rings

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Re: Drawback for Uberti Chamber
« Reply #11 on: December 22, 2014, 01:19:04 PM »
Comment on the larger chamber.  This chamber results in a shorter neck on the case.  I find the 300 grn. gas check bullets I got from Lead Heads barely fit in the neck so they do not intrude into the powder area of the case.  I have read that having lead bullets protrude in to the powder area of a case is bad for accuracy.  My 400 grn. loads seem to bear this out.  I could not neck size my fired cases with my Lee 45-75 dies with out setting the shoulder back some, so I ordered Lee's custom neck size die.  Problem with that is after neck sizing with the Lee custom die, when I seat the gas check 300 grn. bullet, the bullet will slide in and out of the case.  Not enough neck tension.  Called Lee and they recommend annealing the cases.  Have not tried this yet.

As for loads, since the 45-75 with Uberti chamber has a greater powder capacity than the 45-70 with a 300 grn. bullet you can used the 45-70 300 grn. bullet loads for a Springfield and work up from there.  Loads for the 45-70 with bullets heavier than 300 grns. may be too hot be cause the heavier bullets will protrude into the powder area of the case reducing powder capacity possibly below that of the 45-70 with the same weight bullet.

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Offline yahoody

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Re: Drawback for Uberti Chamber
« Reply #12 on: December 31, 2014, 05:43:49 PM »
King, I am using the factory Lyman 45-75 dies with a big Uberti sharp shoulder chamber.  No issues at all loading on the dies.  I also use the Oregon Trail traditional 45-75 bullets in 300gr and 350gr with the crimp groove positioned where it should be.  I have full contact on the 350s for neck tension without the bullet base going beyond the case neck.  More yet on the 300.
"time leaves tombstones or dry bones"  SASS #2903

 

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