I am just starting into gathering the components to reload for the 444 Marlin round. The bullets I have vary somewhat in diameter and I was wondering if that would be cause to adjust powder loads. I have some 300 gr JFN that measure .430 and some 265 gr. JFN that mic out at .429 (just like the Hornady box states) Should this .001 be something I should worry about? Rather ask the question that have to ask the smith to fix something down the road. Thanks

.001 may not make any difference as far as saftey is concerned . as to accuracy it shouldn't make any diff as long as the rifling is not too worn. The bigger bullets may shoot better out of a worn bore. I use rem corelocks 240 gr. in my .444 @2550 fps. the bigger bullets(265,300 etc) take up too much powder space as they must be seated deeper if using a lever action. Then you can't get as high velocity. 240 gr is plenty for deer. I go to the 265 gr if hunting moose.

.429 and .430 bullets should not cause a problem in your .444....now go shoot a moose.