Hello Mr. Stanton-
I'm new to this forum and am really enjoying what you have done with the site. I was perusing some of the older posts regarding the .375 Winchester and note your recommendations for AA 1680 as being an excellent powder choice.
I have two questions I'd like to ask...
1. Could you please confirm a load listed in one of your previous posts:
BTB .377" LFNGC / WW-375 brass / AA 1680 - 36.0 grs. / WLRP / 2123fps - Marlin 375 20" bbl.
In another posting you list:
BTB .377" LFNGC / WW-375 brass / AA 1680 - 30.0 grs. / WLRP / 2051fps - 20" bbl.
The load featuring the 36.0gr charge is considerably higher than that listed by Accurate Arms in their manual for a cast-250 bullet and I also note that the efficiency (fps/gr) is some lower by about 10fps/gr. comparing to your 30.0 gr load.
I wanted to check to see if this load was printed correctly or if there may have been a typo.
2. Question re: sized diameter of bullet and bore leading. If a bullet is oversized compared to the groove diameter - is it more likely to lead?
I've slugged the bore on my .375 BB and have a groove diamter of .377", The throat measures .3795". I've been casting a bullet of my own design (.270" meplat, 310gr. GC design) that drops from the mould at .379" and have been shooting them at this diameter but am experiencing leading. (primarily in the area just ahead of the throat)
Bullet BHN is about 12.5 (WW + 2% Sn, air cooled) with velocities running from 1500fps to 1750fps in a range of initial loads I've tried with different powders. I'm truly surprised because my thoughts are that this is a fairly low range of velocities to experience this kind of problem. Is it possible that the bullet being oversize vs. the grooves is the reason for the leading trouble? Do you have any other suggestions as to where I may be running into trouble?
Any help you could offer will be much appreciated!!!
Thanks & God Bless-
Sky C.
Longmont, CO
I'm new to this forum and am really enjoying what you have done with the site. I was perusing some of the older posts regarding the .375 Winchester and note your recommendations for AA 1680 as being an excellent powder choice.
I have two questions I'd like to ask...
1. Could you please confirm a load listed in one of your previous posts:
BTB .377" LFNGC / WW-375 brass / AA 1680 - 36.0 grs. / WLRP / 2123fps - Marlin 375 20" bbl.
In another posting you list:
BTB .377" LFNGC / WW-375 brass / AA 1680 - 30.0 grs. / WLRP / 2051fps - 20" bbl.
The load featuring the 36.0gr charge is considerably higher than that listed by Accurate Arms in their manual for a cast-250 bullet and I also note that the efficiency (fps/gr) is some lower by about 10fps/gr. comparing to your 30.0 gr load.
I wanted to check to see if this load was printed correctly or if there may have been a typo.
2. Question re: sized diameter of bullet and bore leading. If a bullet is oversized compared to the groove diameter - is it more likely to lead?
I've slugged the bore on my .375 BB and have a groove diamter of .377", The throat measures .3795". I've been casting a bullet of my own design (.270" meplat, 310gr. GC design) that drops from the mould at .379" and have been shooting them at this diameter but am experiencing leading. (primarily in the area just ahead of the throat)
Bullet BHN is about 12.5 (WW + 2% Sn, air cooled) with velocities running from 1500fps to 1750fps in a range of initial loads I've tried with different powders. I'm truly surprised because my thoughts are that this is a fairly low range of velocities to experience this kind of problem. Is it possible that the bullet being oversize vs. the grooves is the reason for the leading trouble? Do you have any other suggestions as to where I may be running into trouble?
Any help you could offer will be much appreciated!!!
Thanks & God Bless-
Sky C.
Longmont, CO