I'm not entirely sure what you mean by nutting hard in a scene. It could mean a powerful orgasm regardless of the size of the load, but I'll interpret it as being the size of the load.
Depending on how long you've been watching / collecting porn you may already be aware of one of the more prodigious males in the business, Peter North. He was a legend when he was active in his heyday in the 1980s and 1990s and even into the 2000s. I'd source some of his scenes if load size is what you're looking for.
Another source is a site called "Jesse Loads Monster Facials." In most of those scenes the guy delivers as promised. The site has been around for a while and is still active so it's a good value too.
https://jesseloadsmonsterfacials.com/
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