Hey guys, I just got back from the range with my father-in-law and I've got a little bet going and I need some wisdom.

-Father-in-law shoots groups with a HOT barrel.

-I tell him he should wait for the barrel to cool between shots to get a better sense of the groupings. (This is what I've read but I've never tested the opposite)

-He says it doesn't matter because a hot barrel will only change POI and not impact the actual groups.

(In his defense, he was shooting really tight groups with a piping hot barrel. But I think those groups might be different if the barrel had a chance to cool between shots)

Also, hes shooting a bull barrel .308. Not sure if that matters at all...

What are your thoughts?