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August 21, 2018, 09:56 PM | #1 |
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Join Date: February 10, 2000
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Case trimming the 45-70 for COL of 2.550
To get a COL of 2.550” with the Hornady 325 grain FTX I have to trim the case to about 1.97”. This leaves a case capacity of about 44 grains of IMR 4198. This load is below maximum but is right at 100% capacity to slightly compressed to crimp at the cannelure of this bullet. Will a this load generate excess pressure (above SAAMI recomendations) due to the shortened case even though the powder charge is below max.?
My rifle Henry H010 will not cycle the Hornady LeverRevolution cartridge due to its COL being longer than 2.550”. I do like the improved trgectory of the FTX. I get about 1800 fps with 43 grains of IMR 4198 and wanted to check 44 grains also but am concerned with possible excess pressure since I changed the case capacity. Thanks in advance, Bill
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August 22, 2018, 05:07 PM | #2 |
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CAUTION: The following post includes loading data beyond or not covered by currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The Firing Line, nor the staff of TFL assumes any liability for any damage or injury resulting from use the of this information.
QuickLOAD thinks 44 grains will be getting pretty close to the same peak pressure a full-length case would give you with Hornady's maximum load for a Marlin 1895, but not over it. What I don't know is if your particular gun can handle the same pressures as the Marlin.
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August 22, 2018, 06:21 PM | #3 |
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Trimming the 45-70...
Thanks Unclenick! According to Henry it can
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Prosecute criminals to the fullest extent of the law and their weapons will become harmless. "Let us speak courteously, deal fairly, and keep ourselves armed and ready." Theodore Roosevelt 1903 |
August 23, 2018, 10:06 AM | #4 | |
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https://en.wikipedia.org/wiki/.45-70
Quote:
I do not want to confuse other reloaders but I do shorten cases for short chambers when 'the short' means the chamber is short from the shoulder to the bolt face. F. Guffey |
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August 23, 2018, 11:59 AM | #5 | |
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Quote:
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August 23, 2018, 03:30 PM | #6 | |
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Join Date: July 18, 2008
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Quote:
And then the OP went on to say something about high pressure. Before seating the bullet he shortened the case .125", so if I was crimping and the bullet had a groove that was not exactly where I wanted it I would choose not to crimp. But if I had no choice I would crimp in the groove. If it was absolutely necessary to crimp in the groove I would place a new groove on the bullet. F. Guffey |
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