I first time I reloaded 300 WSM was about 2004. Every funnel I had would not seat the neck in funnel against the bevel. Powder fell on the loading block when I removed the funnel. Dump the powder and start over.
I took one of my plastic funnels and drilled the hole in the funnel bevel out to I believe 9/16". Till the shoulder cleared the funnel and the neck contacted the bevel proper. Have had no problem since.
I have the Area 419 funnel with drop tube and funnel heads in 7mm and 338. Very nice gear. Zero static problems. If you want to pay the extra for something that you could pass on because it will last this would be my suggestion.