greenjoytj
06-17-2020, 08:16 PM
I have 2 Ruger New Vaquero’s 45 Colt.
Last summer I cast a bunch of Lyman 452664 250 gr RNFP bevel base single lube groove bullets.
They worked fine in my Miroku/WinM73 but won’t chamber completely in the Ruger’s.
The case rim won’t seat down onto the cylinder it stands off just enough not to allow the cylinder to rotate freely it binding terrible.
At home I cleaned the revolvers and with just a cylinder in hand I plunk tested several cartridges in all the chambers an found the case stopping just short of fully seating the rim onto the cylinder. A very firm push will fully chamber the round.
Close examination looks like a issue with bullet sizing.
After bullet sizing the top drive band is smeared wider towards the ogive creating a wide band like a semi wad cutter above the case mouth.
The width of the band is not evenly symmetrical all around as cast bullets don’t drop round from the 4 cavity Lyman mold.
The extra width of the top drive band where the lead is displaced the most is at the mold part lines. It is this small bit of extra lead smeared up the ogive seems is causing the problem, it is hitting the throat before the case rim fully seats into the cylinder face.
Never had this problem with my LEE 452-255-RF bullets or my SAECO #955 .452”/.454” 255 grain RNFP and sizing that #955 bullet to .452” nearly smears way the crimp groove.
How down I fix this?
I don’t want to shorten the case length as there mostly at the trim to size now, although shortening the case would make this bullet work.
I’ll need to check case lengths now that they been fired twice.
Not expecting any case length growth in the straight wall cases.
I liked this Lyman bullet in the M73, the big single lube groove, the bevel base was not a problem and made bullet seating easier, lubed easier than the two groove LEE bullet.
I plunk tested all my handloads in a gauge, not the actual chamber they were to be fired in, learn by burn.
Last summer I cast a bunch of Lyman 452664 250 gr RNFP bevel base single lube groove bullets.
They worked fine in my Miroku/WinM73 but won’t chamber completely in the Ruger’s.
The case rim won’t seat down onto the cylinder it stands off just enough not to allow the cylinder to rotate freely it binding terrible.
At home I cleaned the revolvers and with just a cylinder in hand I plunk tested several cartridges in all the chambers an found the case stopping just short of fully seating the rim onto the cylinder. A very firm push will fully chamber the round.
Close examination looks like a issue with bullet sizing.
After bullet sizing the top drive band is smeared wider towards the ogive creating a wide band like a semi wad cutter above the case mouth.
The width of the band is not evenly symmetrical all around as cast bullets don’t drop round from the 4 cavity Lyman mold.
The extra width of the top drive band where the lead is displaced the most is at the mold part lines. It is this small bit of extra lead smeared up the ogive seems is causing the problem, it is hitting the throat before the case rim fully seats into the cylinder face.
Never had this problem with my LEE 452-255-RF bullets or my SAECO #955 .452”/.454” 255 grain RNFP and sizing that #955 bullet to .452” nearly smears way the crimp groove.
How down I fix this?
I don’t want to shorten the case length as there mostly at the trim to size now, although shortening the case would make this bullet work.
I’ll need to check case lengths now that they been fired twice.
Not expecting any case length growth in the straight wall cases.
I liked this Lyman bullet in the M73, the big single lube groove, the bevel base was not a problem and made bullet seating easier, lubed easier than the two groove LEE bullet.
I plunk tested all my handloads in a gauge, not the actual chamber they were to be fired in, learn by burn.