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We own a Uberti 1876 centennial.. specs on the gun are
45/75WCF
28" barrel
.458" dia. bore

Since factory ammo is about $4 a shot we cast/reload our own.

We have been using this mold...

http://www.buffaloarms.com/browse.cfm/4,1537.html

With a 42 or 43gr charge of H4895 behind it, OAL just at the beginning of the rounding off at the top...so it gives an OAL of I think 2.25" (I don't recall for sure the number but its around there.... on my chrono it gives me a 1525fps average...

We cast 50/50 (linotype/pure lead) BHN of around 15ish... and lube/sized to .458" dia.

I have faith in myself being a good shot... the gun has iron sites that aren't anything to brag about but I can still shoot with them... so I rule shooter error out.. the accuracy at 100yds is really nothing to brag about... probably 6" at best....and going out to 200ish yds its almost a 1' group if you can even pull it off.

I understand that people load this same bullet in 45/70... is this bullet just not accurate or am I getting decent groups for the gun I am shooting?

Any help would be great because its a fun gun to shoot but accuracy isn't really what I'd like it to be.

MIke.
 

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I don’t know about loads for the 1876 but that is a pretty light load of IMR 3031 for the 45-70.
I believe 50.0 grains of IMR 3031 is lightest load I have used with the 457122HP bullet in the 45-70.
Are you sizing this bullet? In all of my rifles the 457122HP bullet will chamber when hand lubed and seated as cast without sizing.
I seat this bullet to a cOAL of 2.550”. What length will chamber in your rifle?
What length cartridge will cycle through the magazine?

I should have added Ken Waters seated the 457122HP bullet to a COAL of 2.560".

Sitting here studying my load book and I saw that you are sizing to .458”
What sights are you using on this rifle. My particular interest is the shape of the front sight.


 

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This is a favorite bullet of mine so I loked a little closer. Take another look at the Coal because the COAL of 2.250” leaves .145” outside the case.
The 457122HP has an overall length of .925” and loaded to 2.550” Coal this leaves .445” out side the case and a seated depth of .480”. This leaves us room for 47.8 grains of IMR 3031 uncompressed. Your load of 42.0 or 43.0 grains of IMR 3031 is probably a pretty good load for the 1876 rifle.
 

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This is a favorite bullet of mine so I loked a little closer. Take another look at the Coal because the COAL of 2.250” leaves .145” outside the case.
The 457122HP has an overall length of .925” and loaded to 2.550” Coal this leaves .445” out side the case and a seated depth of .480”. This leaves us room for 47.8 grains of IMR 3031 uncompressed. Your load of 42.0 or 43.0 grains of IMR 3031 is probably a pretty good load for the 1876 rifle.
He's not using 3031. ;) He's using 4895.
 

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We own a Uberti 1876 centennial.. specs on the gun are
45/75WCF
28" barrel
.458" dia. bore

Since factory ammo is about $4 a shot we cast/reload our own.

We have been using this mold...

http://www.buffaloarms.com/browse.cfm/4,1537.html

With a 42 or 43gr charge of H4895 behind it, OAL just at the beginning of the rounding off at the top...so it gives an OAL of I think 2.25" (I don't recall for sure the number but its around there.... on my chrono it gives me a 1525fps average...

We cast 50/50 (linotype/pure lead) BHN of around 15ish... and lube/sized to .458" dia.

I have faith in myself being a good shot... the gun has iron sites that aren't anything to brag about but I can still shoot with them... so I rule shooter error out.. the accuracy at 100yds is really nothing to brag about... probably 6" at best....and going out to 200ish yds its almost a 1' group if you can even pull it off.

I understand that people load this same bullet in 45/70... is this bullet just not accurate or am I getting decent groups for the gun I am shooting?

Any help would be great because its a fun gun to shoot but accuracy isn't really what I'd like it to be.

MIke.
If this is a max load, you might try loading lighter. And also try seating a gas check under the bullet, or an over powder wad.
 

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He's not using 3031. ;) He's using 4895.
Thanks!
I was trying to work some pressure information and cross IMR 3031 to IMR 4895 data to estimate the pressure as I don’t know very much about the 1876 rifle. I am surprised he got as high velocity as he did.
My estimates are having problems as this is a low pressure load. I intended to quote a 3031 estimate and a 4895 estimate but I am still having problems with my estimate. This is an instance where quick load would make the guess easy.
 

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I'm hesitant to recomend anything with a weak action like the 76's had. Whatever he tries it needs to be limited to the load info for a trapdoor springfield. I was going to try suggesting using a heavier bullet, but not so sure that's a good idea in a 76. Might be an issue with the twist rate of the barrel.
 
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