mikeg1005
04-18-2020, 12:13 AM
Hello everyone,
Back when I got into rifle reloading (casted for pistols) my old man purchased a Uberti 1876 in 45-75WCF (WCF not UCF chamber confirmed). We made some 457122 330gr bullets and H4895. The gun would not short less than a 10" group at 100yds. I feel the bullet was incorrectly sized and hardness was off that had a huge contributing factor to this. Almost a decade later with everyone in quarantine and running out of things to do I am going to develop and accurate load from this rifle. After searching the internet for the last week I've order 350gr Laser Cast RNFP as they seem to be a go to for successful 45-75WCF shooters and I was able to get a 1lb on IMR3031, IMR4198, IMR4320 and 5744. I also have on hand 2400, Varget, H4831 (and SC version) and H4895.
This caliber seems to have a lot of experimental testing with it from various shooters but I've came to realize that after comparing loads people have posted that in most cases the load range for 45-75WCF that is producing good accuracy is that of 45-70 trapdoor load data.
Comparing the size of the two cases they're almost identical. Bottled neck will increase pressure but these modern day 45-75WCF are said to be rated to 28k PSI so it would make sense that load data is similar.
49th edition Lymans book has load data for 45-75WCF but for many of the loads they're 20% lower than 45-70 and 20% than where people are find good accuracy.
So I guess my questions are as follows... for the guys load 45-75WCF, are you finding the results of your accurate loads being similar to 45-70 trapdoor pressure loads? And... here is what I've found so far in research as being promising load data worth testing.
All 350gr bullets...
22-24gr 2400 w/ a filler of some kind.
24-26gr AA5744
49-51gr IMR4320
56-58gr H4831
30-32gr IMR4198
42-45gr IMR3031
Because I have a lot of it...40gr of Varget
Any input on from those of you shooting smokeless in 45-75WCF?
Thanks,
Mike.
Back when I got into rifle reloading (casted for pistols) my old man purchased a Uberti 1876 in 45-75WCF (WCF not UCF chamber confirmed). We made some 457122 330gr bullets and H4895. The gun would not short less than a 10" group at 100yds. I feel the bullet was incorrectly sized and hardness was off that had a huge contributing factor to this. Almost a decade later with everyone in quarantine and running out of things to do I am going to develop and accurate load from this rifle. After searching the internet for the last week I've order 350gr Laser Cast RNFP as they seem to be a go to for successful 45-75WCF shooters and I was able to get a 1lb on IMR3031, IMR4198, IMR4320 and 5744. I also have on hand 2400, Varget, H4831 (and SC version) and H4895.
This caliber seems to have a lot of experimental testing with it from various shooters but I've came to realize that after comparing loads people have posted that in most cases the load range for 45-75WCF that is producing good accuracy is that of 45-70 trapdoor load data.
Comparing the size of the two cases they're almost identical. Bottled neck will increase pressure but these modern day 45-75WCF are said to be rated to 28k PSI so it would make sense that load data is similar.
49th edition Lymans book has load data for 45-75WCF but for many of the loads they're 20% lower than 45-70 and 20% than where people are find good accuracy.
So I guess my questions are as follows... for the guys load 45-75WCF, are you finding the results of your accurate loads being similar to 45-70 trapdoor pressure loads? And... here is what I've found so far in research as being promising load data worth testing.
All 350gr bullets...
22-24gr 2400 w/ a filler of some kind.
24-26gr AA5744
49-51gr IMR4320
56-58gr H4831
30-32gr IMR4198
42-45gr IMR3031
Because I have a lot of it...40gr of Varget
Any input on from those of you shooting smokeless in 45-75WCF?
Thanks,
Mike.