I would think if you have been using the o6 and 7mm you will be ok ,and you can always get a muzzle brake later on if you want. Loading the 375 JDJ IS fun!! and man are they ever accurate , I was loading AND SHOOTING groups for the 6.5 JDJ and the 375 JDJ and you would think the big caliber hard kicker wouldn't group as good as a mild recoil round with spitzer bullets , BUT at 100 yds THE groups from the 375 were as good as the groups from the 6.5 !!! As far as reloading its a simple step of running the 444 marlin straight wall case into the 375 JDJ full length die and your ready to go , It necks it right down to .375 CAL. JUST LOAD IT UP AND SHOOT ,its a much easier process than the 309 JDJ , My brother had a little trouble forming cases for the 309 , But some of the poblem was poor quality brass , but in the case of the 309 your going all the down to 30 cal .from .444 ,where with the 375 your not necking down as far and its very easy step.