They do NOT need to be split to work just fine. The maker of yours chose that option but it is not a requirement.
For those of us that wanted to shoot 12's in our 10's before someone else designed and manufactured them for us, we made or had made our own. In the case of the ones Russ helped me with, they were not split and worked just fine.
Stan,
How is that Elsie 10 working for you? I rarely shoot anything but 10's in my Scott now, but 12-13 years ago I couldn't find an easy source for low pressure 10ga data. There was a lot of loads claiming to be, but never with published LUP or PSI readings. 12's on the other hand had abundant low pressure data.
Once Sherman Bell started the ball rolling and Jerry Lape picked up the ball on this site, it became relatively easy (for us here) to find data. I found a single 1 1/4oz load that uses the Federal hulls and SP10 wads I have in abundance and just change the shot size(and type) as needed.
