30 Caliber Checks:
Gator 4.4 gr vs. Hornady 4.5 gr.
Gator 0.017" thick vs. 0.0167" Hornady
Gator 0.073" tall vs. 0.080" Hornady
Gator 0.281" ID vs. 0.284" Hornady
The Gator 30's have a slightly smaller ID than the Hornady. I tried both brands on a particular 30 caliber bullet. Both went on easily and resisted coming off (thanks to the stepped shank). However, I could spin the Hornady, but could not spin the Gator. Hence, the Gator might fit slightly better on undersize shanks, while the Hornady might be easier to install on oversize shanks.35 Caliber Checks:
Gator 3.4 gr. vs. Hornady 3.3 gr.
Gator 0.0093" thick vs. Hornady 0.0097"
Gator 0.073" tall vs. Hornady 0.062"
Gator 0.343" ID vs. Hornady 0.342" - 0.343"
Both 35 checks are unusually thin, compared to other calibers. If I were in charge of making gas checks, I would use a thicker material on the 35's. A thicker check would crimp on tighter. However, no one asked for my opinion.