686 I think are an older NobelSport primer and do not function well in cold weather. Regardless, the 688's are prevalent now and what most of us see and buy when we come across NobelSport primers in the USA.
Link to the NobelSport USA Distributor:
Nobelsport | dkg1 That page has info on the 688 primers (209/688 as they call them) and a free download for published reloading data.
Their data is only for some Hodgdon powders.
I spoke with Alliant a while back about safe data for NobelSport primers. I was told to freely substitute any primer for published load data with a psi of 6500-8500 with Alliant powders. Any data listed over 8500 call and ask Alliant or have your load tested professionally such as at Precision Reloading.
The Red Dot load which I was inquiring was 8700 psi, a couple hundred psi over their 8500 threshold to substitute primers freely with no verification. The guy at Alliant gave me verification that my load would be safe at 8700 psi with a Nobel primer. I have loaded a couple thousand with excellent results and no problems: 18.0 grain Red Dot, TGT12 / CB8100-12, NobelSport 688 primer and any Remington hull such as STS, Nitro, Clay & Field, Gun Club and Heavy Dove. This is a 1200 fps at 8700 psi and is a published load data on Alliant's website. If you use a CB1100-12 wad the psi drops to 8000 which is within the 6500-8500 psi safe zone as Alliant explained to me.
I also received verification to load WinAA, 18.0 grain Red Dot, CB1100-12, NobelSport 688, 1200 fps, 8600 psi.
Per the Alliant website load data, if you use the WAASL12 wad the psi jumps way up to 10,200. So I only use the CB1100-12 wads and stay away from the WAASL12's due to the psi difference in WinAA's.
Using the NobelSport published load data from DKTrading for Hodgdon powder is the obvious safest and best bet. Unfortunately, this download from DKTrading does not include your WSH powder. You may want to call Hodgdon and ask them for insights.
Always check your weights and data.
Hope this helps.