powder question

[hundmeister]

Will be reloading 270 Win with h4831 for a buddy. I have everything I need in components except I have a 1/3 pound powder left from previous loads. how do I go about switching to a different lot after all my current stock is used up mid batch as the new powder as the powder is 2 weeks away?

 

[FOTIS]

Drop a couple of grains and work up. There should not be that much of a difference.

 

[NWBlacktail]

I've actually never adjusted a load for different lots of powder. I've never noticed a difference in typical hunting range type accuracy. But I typically use book max, which tends to be conservative. If I was pushing pressure signs, then I would for sure check loads for different lots of powder.

 

[Elkman]

I've actually never adjusted a load for different lots of powder.

Nor have I, it does't make sense. The powder companies provide us with loading data for a particular powder, not a particular "lot". There is plenty of room built into their loading data for variation. Stay under book max and all "should" be well.

 

[gerry]

You do need to be careful in switching lots of powders one of the reasons I mostly gave up on Alliant powders was there were some really big differences in different lots enough that you could get into some serious trouble if you worked up with a slow lot and then got a can of the hot stuff. RL 15 in the 35 Whelen was the culprit in my case. Hodgdon and IMR powders have been more consistent but dropping a couple of grains of powder and going up is a good idea.