I’m a carpenter/cabinet builder and I bought this instead of building a benchhttps://www.samsclub.com/p/ultra-heavy-duty-workbench/prod1490086?xid=plp_product_1_5
The big box stores will sell laminate countertops in select colors and in lengths starting at roughly 10’ and on 2’ increments upward. And they are pretty cheap. Buy one of the proper length, I’d recommend a light colored one as many reloading parts are small and light is a huge factor in a reloading room. Then get yourself a piece of 3/4” plywood and a tube of PL200 construction adhesive in a tube. Cut the plywood to match the bottom of the countertop. Glue AND screw it to the bottom of the countertop. I made a base frame to support the bench out of 2x6. Anchored it to studs in the wall.