juststarting wrote:Alright, so just heard back from Sierra.
Identical data for starting loads. Longer projectile, which will compress heavier loads, since I am starting around min, data is the same and I'll work up from that.
For target or field? Ie: loading into a mag or single feed?
For single feed target rounds, seat the bullet so the ogive is on the lands; not jammed but firmly on the lands. Then see if they will load in your mag, if not, no biggie.
Why, you ask? 2 main reasons. Being on the lands will hold your cartridge concentricly in the chamber so your fireforming and flow of brass will be as even as possible, creating a perfect fit in the chamber for neck sizing. Secondly, by starting on the lands you have a definite datum point for when you start experimenting with seating depth. Also, being on the lands often results in good results, anyway. For me at least.
Another tip to pass on that i found very helpful, from another forum member. Once fireformed, set your neck sizing die up so that it only sizes the first 1/2-2/3 of the neck. The unsized portion of the neck will act to center the bullet concentric with the bore; especially if you followed instruction A for fireforming.
Good luck and have fun.