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Is it ok to shoot 45-70 in an 1886 45-90?

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Sort of like shooting a 22 short in a 22 LR chamber, I'd think. You might be better off shooting light loads in your 45-90, if you're going to do it a lot. I'd be glad to consider trading my 45-70 1886 for your 45-90


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Was the rifling twist the same for both cartridges? IIRC the 45-90 was designed to shoot a lighter bullet faster. But I am getting to an age where I clearly remember something that never happened.

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The 45-90 was built for express loads in the 1886 partly because the 1886 had a limited OAL and the Sharps version was too long for the 1886. I recall the 1886 had a slower twist. I believe it's the same case as the 45-2.4, but the 45-2.4 had a faster twist than the 1886.


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I was thinking about trading for one, but it seems like alot of trouble. I already have High Wall in 45-70, so I was hoping it was ok to use those rounds in this.

Last edited by 70worm; 12/31/20.
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It is.

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I've wanted a 45-90 in an 1886 for quite a while, but have been too cheap to put up the coin, since 1886 45-90's go for a lot of money. I have a Miroku "1 in 500" 1886 in 45-70 that's pretty (and heavy) that I'd consider as a partial trade.


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Yup do it all the time in my 1886

[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]


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I had an original '86 .45-90, they had a 1 in 30" twist. New ones are the same as the 45-70's. I shot a box of Remington 405 gr trapdoor loads through it once, grouped well enough for 100 yard hunting.

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Originally Posted by Bugger
I've wanted a 45-90 in an 1886 for quite a while, but have been too cheap to put up the coin, since 1886 45-90's go for a lot of money. I have a Miroku "1 in 500" 1886 in 45-70 that's pretty (and heavy) that I'd consider as a partial trade.


With the right bullets you can load and cycle 45/70 cartridges loaded to 45/90 length in your 1886 in 45/70. I can in my Browning 1886 in 45/70. This gives you the best of both options. 45/90 performance potential using 45/70 brass.

You need bore riding cast designs with a longish nose that have a crimp groove in the right place or, alternatively, use a Lee FCD to crimp in place.

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Why don't you just use the right case and be done with it?


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If you can seat the bullet out pretty far in a 45-70 chamber that would be outstanding. Ive often thought that i wanted a 45-90 but i dont think id be gaining much of anything. Ive already got an 1886 45-70 Extra Lite , 450 Alaskan Extra Lite, and an big old heavy octogon 1886 45-70. I really need to play with seating depth on those 45-70 rifles

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45/70 chambers have no throat to speak of, so you need to select bullets carefully if you want trouble free feeding and function.

By way of example in the link below you will find a pic of various bullets - some are loaded to 45/90 length that do feed in my Browning 1886 in 45/70. This shows how versatile a 45/70 can be in an 1886 platform. The chamber is a stock no throat 45/70 chamber.

https://levergunscommunity.org/viewtopic.php?t=71103

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What Fotis said (yes) + 1.

My Miroku/Winchester 1886 45-90 TD has taken a lot of game with factory 300 grain .45-70 ammo at 1800 + fps.

[Linked Image from jpgbox.com]

Most of my handloading has been for .45-90 loads for Africa and other special purposes.

Obviously, it is prudent to clean the chamber after shooting much 45-70 ammo.


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I did it years ago in an original 1886 45-90, worked fine but had to clean the chamber before shooting 45-90 loads.

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I have to be honest and admit I forgot about the 45/90 in the 1886. But; what I have read here does ring true and jog my memory. All except the part that compared 45/70 and 45/90 to 22LR and short. No, wrong! AFAIK, the over all total cartridge length for 1886 ammo in 45/70 and 45/90 is the SAME. There is no power increase. It is much more like 22long and 22 long rifle. That is a difference in bullet weight.

They always said you can shoot 45/70 in a 45/90 Winchester. It must be ok with 405 bullets.

Trading an original 45/90 to get a 45/70, OMG, rethink that idea!! Nobody cares about a Miruko 45/90 but a real Winchester 45/90 is a big deal. It used to be the 50/100 was the big deal. Nobody can afford those any more, so today best most can hope for is 45/90. Now we are talking collector bragging rights. No practical gain in one 45 over the other.

As for Miruko, if they want to get my attention, for the $$$ involved, they should do a 50/100 or stay with 45/70.

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Yes, but why would one do that? Sort or like running regular gas in ones Maserati


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Making a long story short--- I bought the Miroku Winchester 1886 .45-90 TD because I planned to experiment with heavy big game loads for Afrika and wanted the security of knowing it was up to the job. both mechanically and weight wise WRT handling recoil. It weighs 9.5 pounds empty and once I learned how mount the crescent butt plate, it has never bruised me.

Ironically, the 450 grain bullets at 2150 fps loaded by Grizzly Cartridge never generated enough pressure to be a concern. The 1886 can handle way more pressure (and heavier bullets) if needed.
Since the 450 grain North Fork and Punch bullets performed as planned on the ele and buffalo, we concluded the is no need for heavier bullets or higher velocity.

Insurance comes with a price in weight and $.


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Keep in mind the original Winchester 1886 in 45-90 had a different twist then the same rifles in 45-70. The 45-70s could use bullets up to 500 grains. The 45-90 was limited to 300 grain bullets in the era they were made. I don't know how the newest Miroku rifles are twisted, but in 1986 when Browning re-introduced the M1886 they were chambered in the 45-70 but twisted slower like the 45-90s were which is why they shot 300 grain bullets very well, 350s OK and 400 poorly as a rule. 500 grain bullet would impact sideways at 25 yards I has 2 of them and they were definitely "light bullet rifles"


I have been told that Winchester addressed that problem (After the joining with Browning) and the the new Winchester 1886s are twisted 1-18 instead of 1-30, but I have not proven that to myself yet, so take it as hear-say for now,.

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My more recent Model 1886 Winchester .45-70 lever action "Short Rifle" from BACO/Miroku
has a 20"-long round barrel and 1:20" twist.
I slugged it and found a groove diameter of .457".
It will handle cartidges up to 2.800" COL, loading through the gate, feeding from the magazine.
The Hornady 480-grain .458" DGX Bonded can be loaded, crimped on the factory cannelure, for COL 2.785" in .45-70.
Since it is .450" diameter and smaller ahead of the cannelure, it works fine in the no-throat SAAMI .45-70 Gov't.
Just like JFE said about selecting cast bullets for bore-rider noses.

If using the steel-jacketed .458" DGX in the .457" grooves,
just for fun I might push them through a .457" LEE sizer and leave the lube on them
before loading, with a wax paper, milk carton, or playing card wad over powder.
For hardcast, FNGC, powder-coat-painted bullets in similar smokeless loads I would size them to .459" bearing with bore-rider nose.
No need for a .45-90 that way.
That even kills my desire for a .450 Alaskan.

BTW the BACO Winchester 1885 High Wall .45-70 Gov't. has a groove diameter of .457" also, but 1:18" twist, 28"-long octagon barrel.
That one is a 2010 model year.


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