I will try to make a post again. The last time, the site dumped everything I typed! Hate it when that happens! LOL!
The bullets will perform just fine OP. The bigger the met plat, the better typically.
Big cast bullets going even modest speeds like 1300-1500fps will kill moose super effectively. So many modern day hunters lack confidence in their set up if an animal doesn't drop dead at the shot. LOL! Not every animal does regardless of modern ballistics.
I have shot many big game animals with cast bullets, and have never had an issue what so ever.
A few years past, a friend and I shot a Muley doe at 250 yards with a 308 winchester cast bullet (lyman 311299 design, 200 grains, .310" dia,Lyman super moly lube,Gas checked,and pushed at 2350fps average). One shot and the doe just staggered and went down after step or two. The bullet passed clean through, and created a 2-2.5" wound channel through the vitals. Very effective.
This season, I shot a Muley doe at 100 yards with my Browning 1885 BPCR, and a 520 grain soft alloy, bullet. Penetration was amazing and the wound channel was stupid big! The bullet was recovered and was a little bigger in diameter than a Canadian loonie. She was hit facing me, and she never went more than 4 or 5 steps before falling over. Again, very effective for my needs.
Here are a few pictures of cast bullets in action. And the velocities are around 1300-1450 for this bullet. No need for a gas check at this velocity/pressure range.
Bullet highlighted in the picture is a 420 grain, .460"
This is a 520 grain Flat point I asked Tom at accuratemolds.com to build for me.
The OP is thinking inside 150 yards, and that will be easy enough to do with those cast bullets and cartridges. Velocity doesn't have to be 2000fps plus though to kill a moose effectively.
I had Tom at "accurate molds.com" build me some bullet molds for hunting. He can build a guy a mold to suit a hunters/target shooters needs.
Varying a bullets alloy can dramatically change a bullets penetration characteristics! Soft bullets create huge wound channels, medium hard bullets penetrate amazingly! I have had hard 550 grain cast bullets go through 3-4' of green poplar and keep going (at 1450fps)!
Powder coating is another option for higher velocities for sure. I haven't bothered with it much, due to getting all the performance I need at conventional cast velocities.