570 gn Solid for 500 Nitro

The new solids from Woodleigh have just arrived.Phone conversation with Woodleigh suggested loads suitable to same weight softs of traditional construction could be used.
These are very long projecties.They weigh 570gn,same as the old solids and the body runs less than bore diameter.Only with significant load compression could I produce a loaded round using my usual load of 94gn R15 that would provide about 2mm clearance to the engagement of the rifling.I used a small 6mm slice of foam wad over the load to try and prevent powder grains blistering the walls of the case.
I pulled a load apart and found these compress to next to nothing.The rounds did chamber effortlessly in my 500 double when finished.OAL at 88mm.
Have yet to fire any.
Any advice from those who have used them?