New Lot = Too fast

[Bigwheels]

Trying to decide which way to go. Had to switch powder lots, & the new one didn't shoot well, so I chrony'd, & it's 30 fps faster.(300WM/225HPBT/74.1gr H-1000) So do I load up 4ea. 5 rnds from 73.5 up, & round robin for good groups again, or load up 2 sets of 10rnds to shoot over the chrony, looking for my old fps reading that shot great?

 

[Quigley77]

Re: New Lot = Too fast

Load one round at 73.1 gr. and chrono it. Note the speed, it should be close to your original load. Adjust up or down slightly if necessary. Load an additional 5 rounds and shoot for group test. If it doesn't approximate your original groups, then you could start your round robin testing.

 

[1lnbrdg]

Re: New Lot = Too fast

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Quigley77</div><div class="ubbcode-body">Load one round at 73.1 gr. and chrono it. Note the speed, it should be close to your original load. Adjust up or down slightly if necessary. Load an additional 5 rounds and shoot for group test. If it doesn't approximate your original groups, then you could start your round robin testing. </div></div>

This works for Varget also.