300 RUM for long range rifle.

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I would like to try them are they as accurate as the Bergers?

Yep.
Here's 5 shots with 143 eldx out of my creed
 
I have a problem with getting this "off the lands thing figured out" because of the length of the magazine. I have worked with setting up the sweet spot off the lands a little bit, and I know that is an important part of the process. Thought of using the first bullet to manual feed and setting up sweet spot off or on the lands with that one. I probably don't need to spell this out for you guys. Now I remember the another reason I was sticking with the 168 bergers. The longer the bullet gets the more it will push back into the powder, because of the limitation in the magazine so this is a tradeoff for me. I have seen a kit out there that extends the magazine for the RUM. It may be another thing I will have to invest in to get the basics in place.
All of my bolt guns are single feed.
 
+1 for th 200 grain accubonds. 91 grains of H1000 for me. Nearly 3100 fps.
An upgrade in a trigger will surely benefit you.
That stock will definitely help you out!
 
Wyatt's also makes an extended magazine that you could have installed to load long if necessary. I've got one sitting on the shelf I've yet to have installed on my rum. I shoot the 230 Berger at 3000 with retumbo out of a 26" proof barrel. They're too long to fit in the mag with my seating depth but you can still fit one in it along with one in the chamber. Doesn't really bother me as a follow up shot is there if needed.
 
I just shot 10 rounds with B &Car stock. 210 gr Berger hunting, 90 gr retumbo cases were cleaned really good shoulder back .001or some where there abouts, where bolt closed smoothly. trimmed all be same length 2.845. bullet was .01 off the lands b-oj 3.175. aol ended up being 3.825. picture below was the second group .550 first group was .885. They were a bit on the hot side and only minor signs of pressure. however, grouped ok and I think I can do even better back home instead of out in the desert off a tale. I thinking I need to drop a grain or two they don't need to be going out at 3350-3400. I think that 3100 would acceptable. What you guys think?
 

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I just shot 10 rounds with B &Car stock. 210 gr Berger hunting, 90 gr retumbo cases were cleaned really good shoulder back .001or some where there abouts, where bolt closed smoothly. trimmed all be same length 2.845. bullet was .01 off the lands b-oj 3.175. aol ended up being 3.825. picture below was the second group .550 first group was .885. They were a bit on the hot side and only minor signs of pressure. however, grouped ok and I think I can do even better back home instead of out in the desert off a tale. I thinking I need to drop a grain or two they don't need to be going out at 3350-3400. I think that 3100 would acceptable. What you guys think?
I think if you're truly getting 33-3400 out of that thing with 210 bergers it's definitely hot!
 
The 212 eldx wouldn't group out of my win mag with h1000, h4831 or retumbo. Tried several seating depths and ran ocw tests. I think it's my gun though its picky. It shot the 210 vld right at moa. I just bought some 215 hybrids and am hoping they do well. 190 custom competition with 73.5 gr h4831 is my pet load right now. Really wanting a heavier bullet though.
 
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