UH ,is this for a 44 or 45grain bullet? I gotta say this,the only 300 grain mold I use is for a 45-70 rifle I HAD one for 375 but it went with the gun! I shot a couple deer with 240- 250 grain 44 mag bulletsand was pleased with the results.Lee molds are notgoing to take the amount of use a Saeco will ,but I have more Lee's than any other brand. The fact they are so cheap(relatively) makes them so attractive.You aren't out much $ if the gun doesn't like that bullet. I have 3 .44 molds now and they weigh from 200 to 245. I wouldn't want to carry all the bullets I've cast with them at once. I'd go with a Lee till I got used to casting and know what the gun seems to like. Besides ,if your like me you'll get several molds just because!!!