Buy a chronograph & find out what sort of performance your getting with factory stuff. Then work up loads that perform similarly. In most instances the best you can do is duplicate the performance characteristics. It's not like Winchester or Federal is going to give you their recipe. Besides, it seems to me that exceeding factory ammo performance is one of the goals of reloading. It's been my observation that since factory ammo is essentially built to work OK for most people, most of the time, it's not really much of a trick to make your home grown stuff shoot better.
MSgt, USAF, Retired
NRA Life Member
Liberals are constantly telling us about the poor and oppressed in this country. With that in mind, why do they feel the need to keep importing poor people from other countries?