Shrinkmd
Member
I am loading the Dardas 240gr LSWC, which when seated to the crimp groove is measuring around 1.594. In the Hornady book, they list minimum OAL for their 240 LSWC as 1.610. Then when you look at Lyman, it has the Lyman #429667 listed with minimum OAL of 1.645, and a larger 250gr bullet at 1.610. And good old Lee manual 2nd Ed lists "240 grain lead bullet" with minimum OAL of 1.600.
Lee's data for this load in Unique runs from 10.7 to max 11.8, which is similar to the Lyman Cast Bullet Handbook 4th Ed which lists 10 to 11.7gr, although at the 1.645 OAL.
Previously loading these same bullets, I chronographed them at 991 avg at 8.5 gr and 1092 at 10.0 gr of Unique. This is in Starline new 44 mag cases, Federal LP primers, shot in a the S&W 629 V-Comp 4" barrel (with comp installed, haven't tested if it makes a difference on or off) This was back in June, so it was probably 70s or so temperature wise.
So the 10 gr load looks like it was running a little hotter than the Lyman data from a 4" universal receiver. Hornady says 7.6 of Unique will go 1000, but that is out of a 7.5" Redhawk barrel. And finally, the Alliant data lists a 240 at OAL 1.605 and 7 gr Unique (of course they list a 250 Keith bullet at max 11.0 gr Unique, but a 1.710 OAL)
So, after all this data, does the Lyman Cast Bullet data look ok to use? I think that the 8.5 and 10 gr loads are what most people recommend as "sweet spots" for Unique and a 240 LSWC.
Lee's data for this load in Unique runs from 10.7 to max 11.8, which is similar to the Lyman Cast Bullet Handbook 4th Ed which lists 10 to 11.7gr, although at the 1.645 OAL.
Previously loading these same bullets, I chronographed them at 991 avg at 8.5 gr and 1092 at 10.0 gr of Unique. This is in Starline new 44 mag cases, Federal LP primers, shot in a the S&W 629 V-Comp 4" barrel (with comp installed, haven't tested if it makes a difference on or off) This was back in June, so it was probably 70s or so temperature wise.
So the 10 gr load looks like it was running a little hotter than the Lyman data from a 4" universal receiver. Hornady says 7.6 of Unique will go 1000, but that is out of a 7.5" Redhawk barrel. And finally, the Alliant data lists a 240 at OAL 1.605 and 7 gr Unique (of course they list a 250 Keith bullet at max 11.0 gr Unique, but a 1.710 OAL)
So, after all this data, does the Lyman Cast Bullet data look ok to use? I think that the 8.5 and 10 gr loads are what most people recommend as "sweet spots" for Unique and a 240 LSWC.