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Misfires & Problemswith 45-70 marlin 1895

4597 Views 6 Replies 6 Participants Last post by  swifty
This afternoon, I shoot about 20 rounds with 5744 30 grains
and had two misfires with federal large rifle primers. I rechambered thede rounds and they fired properly. I did notice some unburned powder in my rifle barrel.
I have using the RCBS priming unit that fits on my Rock Chucker with a primer tube feed.
Now i am beging to question the powder 5744 , partial fill,
priming technique,bullet crimping( used the Lee crimp).
Also, I got some erratic velocities on my Pact chronograph.
The volicities ranged from 1270 feet per second to 680 feet per second.
I have used the same chronograph before with consistant velocities. I shoot several rounds with my 375 H7H mag
whic seemed to be consistant.
I called Accurate powder company on Friday.They assured me that 5744 would perform properly with a partil filled cartridge.
The rounds printed well on a 50 yard target.Its just that I got some misfires, unburned powder, and eratic velocities.
Comments or answers will be appreciated.
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Quite often what you described can be caused by one of three things. Gun related, gunk aroung the firing pin slowing it down. Often, it will fire the second time, firing pin strikes usually look very light.
The next are reloading problems, as was mentioned, when you see the gun go snap, the first time, then boom the second, and this happens several times, I suspect two things. One, the primer pockets were not cleaned or two, the primers were not seated all the way into the bottom of the primer pocket. The first hammer strike seats the primer all the way. If you look at the primer after the first strike, it will appear light. Then try it again and it goes boom, the primer strike will look normal. The build up of crud in a dirty primer pocket cushions the first blow, but is compacted by it so that it will fire the second time. Either condition gives exactly the same indications. If you do not clean primer pockets, start. If you seat primers with the press mounted arm, you might want to get a hand primer or a bench mounted priming tool so that you can feel the primers contact the bottom of the pocket. I bet that cures the problem. Good luck.
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