That Glock 20 will serve you fine, if you reload, you will be able to get significantly better performance than with most factory loads. If do not, double tap and buffalo bore both make some excellent hard-cast loads. I shoot far more pistol rounds a year than rifle, usually in the 12,000+ a year range, and I still only carry a 44mag loaded with a moderately hot hard-cast round when in bear country. The follow ups could very likely matter and you will be far better off shooting the Glock than some hand cannon you have only shot a several dozens round though. Edit: Sorry, I just noticed the date on the OP.