The hyper-Calvinist does not believe in the free offer of the Gospel, expecting that God will save men without human intervention. As a result, this is the grossest form of heresy, and invalidates Jesus' words in the Great Commission.
When William Carey, a Calvinist, proposed the missionary enterprise, he was rebuked by a hyper-Calvinist in this way: "Sit down young man. You are an enthusiast! When God pleases to convert the heathen, He will do it without consulting you or me." Carey, the Calvinist, wrote An Enquiry into the Obligations of Christians to Use Means for the Conversion of the Heathen, and then devoted his life to missions.
What makes you think that Palmer is a hyper? (BTW, I am once again 70 miles away from my bookshelf, and did not get a chance last night to confirm if I have Palmer's book.)
Spurgeon wasn't so lucky, and encountered considerable opposition from the formidable hyper-Calvinist contingent existing in London during the time of his ministry. This was a continual battle for him, and something that I doubt we can fully appreciate in this day when the theological tide has shifted so far towards Arminianism.