No. 41, I guess.....started about 1968 or so.
Load most every thing I shoot----from .22-250 to .45-70. Started with .243 Win and have loaded 6mm Rem., 7mm Rem Mag., .308 Win., .30-06, .300 Wby, .300 Win, .300 RUM, .338 Win, .338 RUM, 7 STW, .25-06, .270 Win, .38/.357, .41 Mag,.44 Mag, .45 APC, .45 AutoRim, .45 Colt. Could have missed one or two on the list, several not loaded at present.
Got a chrony several years ago; still use it when the moon is right........interesting to see what the factory loads really produce; usually somewhat less than catalog. The early Rem. factory 7 STW 140 Corelock stuff was about 100 fps FASTER than catalog---checked it on two different chronographs. Haven't checked recent production.....