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Bullets for my .45-70s

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Old 05-05-2019, 10:48 AM
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Default Bullets for my .45-70s

Man the more I keep reading up on this the more confused I get. My Pedersoli 1874 Sharps has a 32" bbl with a 1:18 twist rate and all my Marlins have a 1:20 twist rate. Everything suggests that I SHOULD be getting my best accuracy with 500 gr bullets (lead) with a velocity of around 1200-1250 fps. So far my best accuracy with my Pedersoli has been with 405 gr bullets and with the Marlins I've had good results with Hornady 300 gr HPs.
I am going to try some 340 gr cast bullets shortly in the Marlins. As for the 1874 I can use some advice. I'm all for any load suggestions, I've read that one person paper patches his 500 gr bullets to a diameter of .459". That would require me to get a custom sizing die to .453" which I may be doing anyway to try in my .45 cal muzzleloader.
Send some advice my way with their favorite .45-70 loads for their 1874s and Marlin 1895s.
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Old 05-05-2019, 11:20 AM
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the most consistently accurate load I found for my marlin 45/70
was the nei bullet below sized .459
cast from 95% ww alloy and 5% tin
Winchester or federal standard rifle primers
45 grains of imr4198
easy 1"-1.2" 100 yard ,three shot groups of a good bench rest at 100 yards

its was consistently accurate , if the barrel was anywhere close to clean,
and it was deadly on deer and elk.



http://www.neihandtools.com/catalog/index.html

saco makes a similar mold

https://www.midwayusa.com/product/10...nose-gas-check

Last edited by hardcastonly; 05-05-2019 at 11:31 AM.
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Old 05-05-2019, 12:35 PM
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From what I understand is that if a bullet diameter is slightly under groove diameter the vaporized lead will flow around the bullet and cause severe leading. Why then does Lee make all their .45 cal rifle bullets to .457" rather than .458" or .459".
Now if a .457" bullet is fired down the bore of a rifle or .458" groove diameter, will a veggie wad protect the base of the bullet from this flowing or would a better solution be to size the bullet down to .453" and paper patch bringing it up to .459"?
I'm asking all these questions because I enjoy casting bullets and have been casting for years for my muzzleloaders. But I'm fairly new to casting for CFs. If I can get this down in my .45-70s I may even try to cast for my .30 cals (30-30, .30-06, etc. (with gas checks of course))
Paul in your bullet above it is a .458" bullet. How can you size to .459"? Now you really are trying to confuse me...LOL

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Old 05-06-2019, 05:49 AM
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the NEI mold is NOMINALLY .458 ......its true diam,varies
as it will with most molds
changing the alloy and or casting temps changes bullet diam.
never take posted diam, as fact use a caliper, .. VERIFY NEVER GUESS...deal in proven FACT


as cast with my alloy used, the NEI mold bullets are .460 diam.
as it falls from the mold into my 7 gallon bucket of water.
I generally try to cast at temps that leave a uniform mild frost ed appearance
and drop the bullets in a 90% full 7 gallon bucket of water with a towel in the bottom to cushion the bullets
I cast 300-500 at a time, dry them, and lube them the following day

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Old 05-08-2019, 08:27 AM
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Paul I've been using Starette (spelling) dial calipers and micrometers for decades. Used them in industry and for reloading.
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Old 05-12-2019, 07:38 AM
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Got home and checked my bullet's diameter and they are .458". They should be good. Lubed them with a home made lube of 45% Beeswax, 45% Crisco and 10% Mineral Oil. Now all that's left is to load them up and try them out.
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