Does the software program take into account backward thrust and case wall grip to reduce it?
I don't know? HHI's request for the info on a JDJ case is the second one that I have had. In both cases, the pressures were extreme with the given load that was being used.
My software has the data for most of the JDJ cartridges. I have not owned one although the 6.5JDJ is causing some brain chatter with me.
I have a shooting buddy that has the 7-30 Bullberry that is nothing more than an Ackley Improved case. We have done serious experimenting with it. He will start getting extraction difficulties and absolute flow on the primer (fills out the entire pocket to the case head.). He had to load at 7-30 Waters loadings to avoid pressure. Even at those lower pressures, he has to reisize the brass after every firing or he can't load most of them back into the chamber. That is interesting. We shoot 2 days a week for up to 6 hours each day. I have a portable loading setup and I set up in the bathroom to avoid the wind. We test right on the spot.
I, too, am in a quandry about my data and your JDJ Cartridges and I really don't have any other information. However, after having destroyed three rifles over the past 30 years, I've played on the safe side. Actually, none of them were from over loading with powder.
I have never seen any of JD Jones' loading data. I can't imagine that his data would be improper. He has been in the business for years. I'l bet there have been some firearms meet their demise during his experimentations.
I have done a great deal of experimenting over the years, but as I say, I've never played with JDJ cartridges.
HHI,
I don't think one grain reduction is going to make a knat of a difference in your load. I don't mean to sound like a doom day character, but I really hate it when a gun explodes. I still have the wrap around sun glasses I was wearing when my Sako 308 went kaboom. The glasses were nearly removed from my face and the right lense fell out. There is a nast knick/cut in the frame above the right lense.
If It were me, I would prepare some ready to load cases that just need powder and a bullet seated in them. Either take a powder measure and powder them at the range or take some other cases to hold given amounds of powder in a cartridge box and put a piece of foam over the top of the open case mouths, close the lid and take a press to seat the bullets as needed.
I frequently powder up 10 cases with starting loads and go up to as much powder as I want to try. I fill a 50 round box with 5 different powder charges. That way I can get right at it upon arrival at the range. I can check for accuracy and check for pressure signs as I go. If I get to a high pressure level with one or two rounds, then I don't have to pull bullets from the unused loadings. I simply return the powder to the cannister.
You are getting velocities with your 358JDJ that should be suitable for Grizzley bears. If it were me, I would reduce the loads down to 2100 fps and be safe. 2100 fps with a 200 gr 358 bullet should take anything we have in this country out to 200 yards, shouldn't it?
It has been nice chatting with you.
