OP, the answers here are all good. Your big issue is that you are cash strapped and looking to buy cheap factory hunting ammo in the middle of hunting season.
Live and learn on that one. The next issue you will have is substantially more felt recoil with the 180 grain bullet. It may or may not be a problem.
As for "explosive" IMHO Ganderite did not mean effective. Many 150 grain bullets are constructed on the light side with thin sidewalls so that they expand rapidly.
Cartridge manufacturers are in business to make money. The cheaper they can get the components that will do the job to median standards the more money they make.
If I could make one thing clear to people that insist on purchasing the cheapest factory loads they can find for hunting, you won't be saving a dime. You also say you will be shooting out to 300yds. Are you proficient enough with your rifle to make such a shot???? If you are worried about $10 on a box of ammo I suspect you aren't practicing your accuracy skills much. Do you know where your rifle shoots the first shot from a cold barrel. Do you know if its point of impact is different when shooting from a freshly cleaned bore or from a fouled bore. With most rifles the difference is often large enough to ensure a miss or worse a wounded animal. You owe it to the animal you want to shoot to make its demise as quick and painless as possible.
If recoil is an issue for you, there are some very good 150 grain factory rounds available that are loaded with some very strong and practical bullets. I would suggest you choose those instead of the bargain basement brands. In the end when you figure out the cost of a hunt the box of cartridges you purchase will be the cheapest component.
Accuracy is an issue when hunting at long ranges. For instance a four inch group at 100 yards can be a 12 in group at 300 yards. If you aren't shooting from a rest even larger.
Think about this and make your choice. I hope you have a successful hunt with a good clean kill that is made under 100 yards.
