so...Lyman manual.
I have looked at burn rate charts, I know they aren't interchangeable, and have viewed from different sources which is why I asked the question in the first place.
Just seemed odd on some listings a lighter bullet for example had a lower min-max with IMR then next heavier bullet weight was reversed and heaviest reverted back.
Trying to keep safe and it is difficult to buy and test when stuff ain't available. Was just a question.
Thanks gents.
IMR is bulkier than H 4350, so in light bullet loads in say a 243 or 30-06, it runs out of space before h4350 does. Speer bullet jackets tend to be stickier and longer bearing surface than others. All test guns are different and some companies are a wee more conservative than others with pressure. These are just a few of the many reasons for differences. Bullet design ,core hardness, length of bearing surface all effect it.
