[HUBEL458]

I know for sure is 4198 from fairly new can we tested before.
In cases up to as large as my 585HE with base same size range
as 577NE(.660")fired fine with regular primers. Every powder I have
fires in that size case with large rifle primer and mag shotgun primers
are stronger than lg rifle. It's when case diameter goes to .800
like 12ga or my 700HE or 50BMG then regular primers don't
work on most rifle powders, hence a bmg primer that are 3 times
as strong as lg rifle. In 12ga 4198 misfired or had delayed fire(this
one is when you hear hammer strike then a boom), about half
the loads. Very disconcerting and interesting to say the least.
We can use all powders as I related in posts a while back,
in cases with large rifle primers like magteck or other plastic
cases with shotgun primers, or RMC brass with shotgun primers,
if starter powder like Blue Dot is used. About 10 gr. And best
powder for doing that with is in mid range of the chart.
And stick powders only with starter powder.. Ed