Am I risking blowing my new Turnbull 45-90 up by not using filler in my cases.

I am using IMR 3031 and was told from Turnbull that I did not need filler in the cases.

I have loaded up 100 test cartridges with out fillers and you guys have me worried that I did something wrong

All of the slugs that I have cast are gas checks will that make any difference.

Any advice would be appreciated