Freddie probably has a 30+ homer season in him. People don't realize that 30+ homer seasons aren't as common as they used to be. There were only 14 hitters in baseball who had 30 homers. some guys were curtailed off that number by injuries (Joey Bats) but the metric slid, 25 is the new 30 for homer standards. And if you hit 35+ you're probably just outside the top 5 in baseball. It's not like the old days where you'd have nearly 10 guys with 40+ homers in baseball, that's now reserved for the best of the best, infact the only player to regularly hit 40+ homers is Miggy.
Baseball has changed.
That said I don't think it's a given Freddie consistently hits over .300. We'll have to see how this year plays out, but given his past numbers, he doesn't have the skillset of a .300+ hitter. His K rate around 20% isn't typical of a .300 hitter. If we look at the current 3 year sample of 11-13 there are 24 guys who've hit a qualified .300. on that list 9 have k'd more than 15% of the time, 3 have K's more than Freddie's best season.
When we break down the 9 over the 15% you have
Braun
Trout
Votto
Craig
A-Gon
Carpenter
Kemp
Cutch
Cargo
Immediately throw out Cargo (21.7 K%) as he barely makes the cut and he plays at Coors where way more balls land.
I would also toss out Braun, Kemp, and Trout who have power numbers Freddie doesn't match and aside from maybe a fluke season won't touch.
So basically if you compare semi-similar players (read ditch speed demons who make extra hits happen like Cutch)
You're left with
Votto
A-Gon
Craig
Carpenter
Votto is another likely toss, because Votto is really the ideal form of Freeman's production and I don't think he ever sniffs Votto. Votto has such an amazing eye, still has very good just not insane power, and has averaged over the last 3 full seasons 28% LD.
Freeman's hope for being a .300+ hitter lies in the last 3, Craig and Carpenter are both somewhat small sample sizes. Craig is a weird candidate too as none of his numbers remained constant. When he burst in in 2011 to 2013 his LD% went way up but power went way down. Carpenter just barely fit into 15+ at 15.3 K% as a hitter he's probably more similar to freeman than anyone else on the list. Good patience, high line drives, not a ton of power. Freeman will K more than Carpenter most likely but will hit way more homers. A-Gon is on the list because of his 2011, I think he's more typically a .280-.300 hitter but because in 2011 he had a .380 BABIP it skewed his offensive numbers.
Freeman has been amazing to start the year, and I hope especially he keeps his K totals down, because that's the biggest thing seperating hm from being one of the best hitters in the NL. If he drops his K% below 15% he will regularly hit over .300.