Yeah there is no problem doing that. But if it were me, I'd simply fund the best load possible at mag length since you are going to be shooting from a mag more often than not.
Well, I don't get out of the city much so most of my range time is indoors. For that, the 147gr FMJ and some RL-15 is more than enough and cheap too. Now that the weather is cooling off, I want to get out to the range and do some long(er) range shooting, which for me, will likely be one of the WMA ranges. For going up to the indoor and making bang, mag length is plenty, as it is for hunting and almost any circumstance really. However, it may be fun to sit down and see just how good she'll shoot every once in a while, which is when I may toss the mag, turn off the gas, slip on a fixed power 10x and dial it in...
I am interested in working up some of the faster burning powders and lighter bullets though. The 110-135gr look interesting...