300 wsm headaches

[6.5x53.5]

Wow, I recently aquried a Savage in 300 wsm I have loading data via Lymans. I also had a quanity of older Norma 204. In my very first attempt I concidered the max load for a fastest burning powder H-380, checked the slowest IMR, that being 4350 compramised between the two and attempted a N204 65gr charge with a Sierra 150gr spitzer loading only 5 ( strippings a chore) I took it to my hole and proceeded to punch a sub moa group this with circa 55 Model Perfect Herters standard #120 primers. I was ONE lucky guy or this problem has not yet appeared. I was under the impression with all the hooplaw saying what promise it held for future wildcaters it was a rather forgiving magnum load round, what with the new PPC design factors and such. I DO HAVE TO KEEP THE CHAMBER CLEAN!
I will be following this thread for some time YOU HAVE MY INTREST.
6.5x53.5

DO NOT ATTEMPT THIS KIND OF LOADING ALLWAYS USE AN ACCEPTED LOADING DATA SOURCE AND WHERE APPLICABLE ALWAYS USE THE RECOMMENDED STARTING LOADS! WORK YOUR LOADS UP FROM THERE. ITS NOT WORTH LOOSING YOUR HEAD OVER!!!