Littledevil,
First off, get some Fed 215 primers. You need a hotter flame then the CCI-250 can give you.
Second, if you have a 6.5-7mm RUM, this is a simple matter of needing more powder. YOur pressures are to low and like the old H-870, you need to get up close to working pressures before the powder will perform well. I would imagine you have some pretty serious carbon fouling as well.
In my 257 Allen Mag, which is an improved version of a 25-338 RUM and has a couple grains more capacity then what a standard 6.5-7mm RUM would have, I am using 92.0 gr of WC872 under a 156 gr ULD RBBT.
I am not sure what bullet you are using in your 6.5 but I would assume its a 140-142 class bullet which is common for a heavy weight bullet.
What I would recommend is to forget the 1/2 grain jumps in powder charge.
Start at 86.0 gr of US869 and increase the powder charge a full grain at a time. Load only one round for each load. Work up to the 90.0 gr range and see what happens.
I would suspect you will start to see the hangfired go away at around 90.0 gr and then you can work up from there. This is a very large case capacity for the 6.5mm bore so you will have a narrow pressure window to work with with these powders.
Forget Ramshot magnum, to fast burning for anything but a 100 gr bullet and this is far to light for your case capacity.
Stick with 869, get some hot Fed 215 primers and keep loading up until the hangfires stop. Watching obviously for any pressure signs on the way.
Another tip, seat your bullets into the lands, not dramatically but 5 thou or so. This will help promote intial powder ignition but offering more initial resistance. If you start low with the bullet seated into the lands and work up your load with this seating depth you will work up to perfectly safe loads.
You are basically using 6.5 STW load levels in a case capacity that is MUCH larger then that. Just an issue of low pressure and 869 does not play well with low pressure, work her up!!! /ubbthreads/images/graemlins/grin.gif
Kirby Allen(50)
