imr 4350 is a extended tubular kernel powder- and they're fairly large kernels too- that's why you can only get 50 grains capacity with the standard charge bar- when dillon makes these things, they set it up for MOST applications and your's isn't most, although it is a common powder for the '06 and a lot of others- in other words your 50 grains of 4350 occupies the same space as maybe 60 or more grains of something like ball 2 or ww748, which is what i use, but i've got a 8 lb keg of the stuff and i don't ever see buying anything else as it's so versatile-i've had it since the 90's and only about 1/4 of the way through- when we could shoot our 20 round mags ( grr)anyway, it looks like you HAVE to get the magnum bar if you're going to stay with that powder- wich begs the question- if the magnum bar is required for the '06 for 4350, what about something like the 300 win mag- where you're up in the 70-100 grain range- does dillon also make a"super mag" bar - it seems to me i saw something about a magnum powder measure, when the whole thing was bigger-bigger hopper, bar, the works- anyway, i my 338 win mag set-up i've also got only the standard charge bar, which throws 70 grains , but it's imr 7828, ( i've done the weights for that too) so it's your powder- i'd also be watching for kernel cutting with 4350