Bear with me as I’m a 45+ year hand loader but I’ve never fire formed before. I recently bought a Contender in 7-30 Waters and today finished fire forming 100 new Winchester cases. Or so I thought. I was using 130gr Speers and H335 at about 1.5gr under max. The measurement from datum to head varies over a range of 6-7 thousandths. I suppose I’ll have to take another whack at it to get the brass to really fill out.
My plan is to partially neck size without touching the shoulder and try again. I have 7mm bullets ranging from 120gr to 150gr and the only appropriate powders I have are H4895, Varget and H335 and maybe IMR4350.
So, should I use light or heavy bullets to generate the most pressure? A powder suggestion using one of the four I have would also be appreciated.
TIA
My plan is to partially neck size without touching the shoulder and try again. I have 7mm bullets ranging from 120gr to 150gr and the only appropriate powders I have are H4895, Varget and H335 and maybe IMR4350.
So, should I use light or heavy bullets to generate the most pressure? A powder suggestion using one of the four I have would also be appreciated.
TIA