Originally Posted by Prairie Dog50
I have a savage model 12fv chambered in .22-250 with a heavy varmit barrel. We have tried a variety of different hand-load recipes with a variety of powder and a variety of bullets in type brand and weight. All of this of course is done with the proper safety procedures; always starting with the minimum charge listed in the speer reloading manual, and the annual Hodgon's magazine reloading manual and progressively working our way up until we see signs of excessive pressure.. We can get very tight groups with this gun and these hand-loads, however in most cases we can never get past the first minimum charge without flatening or blowing out primers. Oh by the way we use CCI 200 Large Rifle Primers. We were thinking of maybe starting with the minimum charge and working our way lower in half grain increments until the primers quit flatening and when were getting acceptable group sizes. Is there any danger in this?? Or is there perhaps a better way to solve this problem??
If you are getting pressure at the starting loads there are several reasons.
Look at the fired brass and insert a new bullet in the case, (It should fall in). If it doesent go in
easy then you have a tight neck or it is longer than the neck portion of the chamber.
If it is not to long (Can be fixed by trimming) then you may/must turn the necks down.
The other thing it could be is bullet seating depth . If it is touching the lands at all it will raise
the pressure and it will need to be seated .020 off the lands and then you can work closer to
the lands in steps of .005.
Some chambers have no free bore and this is a common condition if not dealt with.
There is nothing wrong with the primers as long as it is the one listed in the load data.
I hope this helped.
J E CUSTOM