you should leave well enough alone.  The thing about H4198 that i liked was how well it performed in the cold as well as the hot.  The n130 didn't do nearly as well in the cold weather for me, and while testing in the shooting tunnel, the H4198 was best.  No lie, Darrel Loker shot a .088" group with my HV .30BR in the tunnel with 5 rounds that were loaded with 5 different powder charges.  We were upping the charges for velocity and just kept shooting in the same hole.  I've got that target on my reloading bench. 

This year, I'll be shooting the bigger hunter cartridges almost exclusively and will probably leave my .30BR's alone.  I'm hopeful that the .30x46 will be as good for me as the .30BR was last year.  Initial indications are good with the one I just started shooting.  Time will tell.