Gentlemen, I have a perplexing delema. After loading hundreds of 45/70 loads with 405 .458 ww bullets and 3gr. 4198 - 46 to 50 grs. WC 872, no crimp,no wad,fed 215 primers, .456 expander,oal just touching lands. Velocity in the 1200 to 1300 range,good accuracy,no problems. Wednesday I was going to test two different bullets,two different lubes and .458 and .460 bullets. Fresh loads were made and headed for the range,set up the chrono and started shooting. To my suprise these loads were going 1550 to 1600 fps!! Loads were pulled and the powder amount was ok. I,m at a loss to the reason for this increase in velocity, Any help would be appreciated---Turk