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I have my 45-70.sighted and regulated with 405 grain cast lead. Last week end I was shooting 300 grain bullets using yhe same powder charge per the 75% rule. I got a very good group at 25 yards but at 50 yards it spread out quite a bit and was about 4 inches high and four inches to the right. Id this common when using the 75% rule? Also if I were to load the same 405 grain bullets it was regulated with that have been powder coated would you expext a large shift in zero compared to just lubed cast bullets? D R S S member as of 4/30/2014. | ||
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Z: I've been shooting powder coated bullets this summer for the first time and I notice no different in target grouping, but I only have a 50-yard range. As to the 75% rule, my rifles seem to be fairly accurate but not AS accurate as the original load. You can also try the rule in reverse--the 405-grain bullet and 75% of the powder charge. Use filler to keep the powder next to the primer for good ignition. See if this helps. Cal _______________________________ Cal Pappas, Willow, Alaska www.CalPappas.com www.CalPappas.blogspot.com 1994 Zimbabwe 1997 Zimbabwe 1998 Zimbabwe 1999 Zimbabwe 1999 Namibia, Botswana, Zambia--vacation 2000 Australia 2002 South Africa 2003 South Africa 2003 Zimbabwe 2005 South Africa 2005 Zimbabwe 2006 Tanzania 2006 Zimbabwe--vacation 2007 Zimbabwe--vacation 2008 Zimbabwe 2012 Australia 2013 South Africa 2013 Zimbabwe 2013 Australia 2016 Zimbabwe 2017 Zimbabwe 2018 South Africa 2018 Zimbabwe--vacation 2019 South Africa 2019 Botswana 2019 Zimbabwe vacation 2021 South Africa 2021 South Africa (2nd hunt a month later) ______________________________ | |||
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Thanks Cal. I will probably stick with just lead uncoated the rifle likes them. I guess I need to go ahead and get a mold and cast my own. I am already casting .68 balls and Lyman 525 grain slugs for a 12 bore project why not add 405 grain .458 bullets. I guess good groups at 25 yards playing with a 300 grain bullet is okay. D R S S member as of 4/30/2014. | |||
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one of us |
Gentlemen the 75% rule is only a starting point in most cases. Most often one must move up and/or down slightly to get the load to work properly. I have found over time that the substituting of a bullet of approximately 75% of the weight of the normal bullet with a full load of powder or close up, or down works better that the normal weight bullet and 75% powder load. Every double rifle in the world will shoot slightly different with the same load that works perfectly another rifle. If all double rifles would regulate perfectly with a load that shoots in one double rifle they wouldn't be any more expensive that a Walmart bolt rifle. ........................................................................  ....Mac >>>===(x)===> MacD37, ...and DUGABOY1 DRSS Charter member "If I die today, I've had a life well spent, for I've been to see the Elephant, and smelled the smoke of Africa!"~ME 1982 Hands of Old Elmer Keith  | |||
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I have found the same--the 75% rule works best with the lighter bullet than the other way around. But, hey MAC, I've bought all of my doubles at Wal Mart. Cal _______________________________ Cal Pappas, Willow, Alaska www.CalPappas.com www.CalPappas.blogspot.com 1994 Zimbabwe 1997 Zimbabwe 1998 Zimbabwe 1999 Zimbabwe 1999 Namibia, Botswana, Zambia--vacation 2000 Australia 2002 South Africa 2003 South Africa 2003 Zimbabwe 2005 South Africa 2005 Zimbabwe 2006 Tanzania 2006 Zimbabwe--vacation 2007 Zimbabwe--vacation 2008 Zimbabwe 2012 Australia 2013 South Africa 2013 Zimbabwe 2013 Australia 2016 Zimbabwe 2017 Zimbabwe 2018 South Africa 2018 Zimbabwe--vacation 2019 South Africa 2019 Botswana 2019 Zimbabwe vacation 2021 South Africa 2021 South Africa (2nd hunt a month later) ______________________________ | |||
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| one of us |
Where else would one buy GARBAGE CAN Classic double rifles, instead of the best double rifle in the world? ....................................................................  ....Mac >>>===(x)===> MacD37, ...and DUGABOY1 DRSS Charter member "If I die today, I've had a life well spent, for I've been to see the Elephant, and smelled the smoke of Africa!"~ME 1982 Hands of Old Elmer Keith | |||
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