Originally Posted by cerwin
What would you recommend to me as far as further load testing. How do you find your loads? I'd like to get a load nailed down at the upper end in the least amount of rounds possible.
When my RUM was in all factory condition, I burned the barrel out looking for something it would shoot consistently well. Never did find that with all factory ammo, and rifle.
The only thing left of that original rifle is the completely blueprinted action. It would appear that I'm on to something good, but I dont want to stop where I started. There should be something at the upper end that will shoot as well.
I see your at book max with 210 VLD's. Should I bump back from that a couple grains and work up to that max, seeing what it does?
I'm using Nosler brass, 215 primers. We'll see how much life I get out of the brass. That stuff is hard to come by these days.
I got a 7 STW coming next month, and I've been trying to get brass for it for 6 months now.
My Sendero shot everything well and I believe that has a lot to do with Sendro contour heavy barrel. Your #4 may be a little more finicky.
That said, you're off to a good start. If you want to minimize development, pick one bullet and one powder. IMO Retumbo is the #1 powder for the 300 RUM. RL 33 may change that and others may disagree. But if you do search on 300 RUM loads, you'll probably see Retumbo more often than any others and with good velocities and accuracy. After reading Broz's threads, I would recommend considering the 215 Hybrids. He got better accuracy and velocity than the 210's and they have a better BC.
The way I would approach it is to work up a grain at a time from where you are now until you reach max. Then shoot for groups at max. The local gun range here only goes to 427 yds and that's where I made decisions on which loads to go with.
If you're happy with the performance at max stay there. If not, you might try some different seating depths as per Berger instructions. If nothing works there then work down in .5 gr increments until you are happy.
I'm a high velocity kinda guy and that is why I have a 300 RUM and other overbores. So if I'm mot getting good groups at or near max it's time to try another bullet and/or powder or try . I would stay with Retumbo.
If you want to shoot a very accurate bullet that's easy to load for, get some CEB's. They are spendy, but you will probably spend less time, bullets, powder and barrel life load developing them. I did put some through my Sendero a couple of years ago and they were extremely accurate. However, if you load the 200 gr C22's you will not get them in your mag box. What i did with long bullets that didn't fit the box was to just put one down in the top of the box and the nose tip would rest just above the rim of the box. That way I still had a quick second shot if I needed it.
I also use the 215 primers and I have also heard the Nosler brass to be on the soft side.