Thanks for the data!
The 260 WFNGC is one of my favorite 44 mag bullets of all time.
I run it with 18-19 grains 2400.
Also in the .445 with 31 grains IMR-4227.
I have just one small caution for you.
I would hesitate to run the Zero .431" 240 JSPFN thru your gun with .4295" throats.
They are obviously working but may be causing either higher pressure than you think or excessive wear on those throats (or both).
I reserve that bullet for the many 44's than have throats larger than .430".
Can't wait to get my hands on one of those model 69 revolvers.
I must be getting to be a dirty old man because the model number makes me think about getting the gun
engraved along the lines of one Ted Nugent had made for him awhile back featuring ... well you get the picture.
Urban legend has it he was friends with Roy Jinks' daughter at the time. (Izzat true Roy?)
I have just chronographed the Zero 240 JSP bullet in the 444 with the following results for those interested in the high end of things:
Virgin Starline brass, WLR primer, IMR-4227 powder:
31 grains - 1958 fps - 22" 444S
35 grains - 2164 fps - 22" 444S
Virgin Starline brass, WLR primer, IMR-4198 powder:
44 grains - 2313 fps - 22" 444S
45 grains - 2375 fps - 22" 444S
44 grains - 2378 fps - 24" Rizzini BR550E
45 grains - 2432 fps - 24" Rizzini BR550E
This is kind of an academic exercise as I suspect the Zero is going to blow up hitting anything at Mach 2.
I would use the Swift A-Frame if a 240 was to be used seriously.
For big game I am working up a load for the Woodleigh 280 weldcore which would be my main jacketed bullet in the 444 other than the Hornady 265FP.
The Woodleigh is designed for an impact velocity of 1800-2200 fps.
Many 444 big game loads are heavy cast gas check bullets.
The 444 Master Reloading Table is curated by yours truly.