Discussion in 'Big Stuff -- 6.5mm, 7mm, 30 Cal' started by freebird63, Mar 14, 2011.
My Bartlein 1/10 twist loves 200 Acubonds with 94.0 Retumbo. 3230 fps and sub 1/2 moa.
mine loves 210 bergers and retumbo. I rebarrel Remington sendero with 28in Brux barrel. gets 3125fps and shoots half minute out to 1000yds. I took it to Africa and outfitter couldn't believe how it took animals out to 500yds. 5 large animals 5 shots all (dit) dead in tracks. I have never been able to get accrbonds to shoot in any of my guns. all my guns which I have to many of love bergers.
Haven't shot 230 bergers, but i do 210 Bergers with 91.0 gr of Retumbo at .010 off in a custom 700 with Krieger 28" (with Vais brake) at 3150 fps.....accuracy to 500 yds is awesome, groups at 1" or under.....yes, at 500 yards. SORRY, just noticed i had already posted this info....But the OAL is 3.975 WITH A Hornady oal comparator and insert . Factory length brass.
My 700 Remington with a 26” barrel likes 92.5 gr of Retumbo with 200 gr Nosler Accubonds.
H1000 hammers in two of the three rums we have with 215 hybrids. The other loves n570 with the 215.
I'm brand new here, and I know this is an old thread, but had to post my pet load for my 300 Rem Umag. I've had mine since it was a new caliber, and there was zero information out there on the web. It was probably the hardest weapon I've ever tried to load for. I tried every powder/bullet combination I could think of, with nothing coming close to sub moa. I was about to give up when I put a 180 Grain Partition in front of the new at the time Retumbo. Bingo, they shot like match grade bullets at a hair outside I/2 moa. The hotter the Retumbo, the better it shot. At 96.6 the Federal 215' showed the slight signs of pressure. 96.5 pushes the Partitions at 3315fps with my Chrony. I'm not sure if my Chrony is that accurate. I bought a new Leupold VX6 with a TMOA Retical to mount. Sighted it in, and the second time I took it to the range, the barrel decided to give it up. I have probably put 2000 rounds down range. I'm getting a new Krieger for it, but I guess that's another thread. Thanks for the cool new site.
I couldn't get mine to shoot very good with the original barrel also. It turned into a 7mm rum and it is accurate now with a Bartline barrel. I have an older sender that was a 300 Jarrett that is soon to be a 300rum but I think with a nut.
I tried many different powders to try and get my Sendero to shoot under MOA. What really surprised me
was the powder that worked best in my rifle was IMR4350...max load 82grains with a 180 grain swift scirraco
bullet. This load was the accuracy load in one of my Nosler reloading books too. I'm getting 3190 or so ....
(can't remember exactly) fps. out of this load. Goes to show that many barrels are different and sometimes
fussy when it comes to finding the right combination of powders and bullets.
My 300 RUM Likes 95.0 grains of Retumbo with a 210 grain Bob Carterucio custom bullet 3250 fps .375 groups.
My rifle has 30" 1:10" Bartlein barrel, PT&G trued Remington action, AICS CIP chassis. The barrel was hand throated to optimize seating 230gr Berger Hybrids. Obviously, loaded single shot.
230gr Berger Hybrids
COAL 3.944", .047" jump
MV 2978 fps, SD 10
I have also tested Warner 198gr monolithics and have a 1:8" 30" Krieger barrel arriving soon. Test in the 1:10" barrel yielded:
198gr Warner monolithics
MV 3195 fps, jump is not a concept
But I haven't tested for accuracy in the too slow twist barrel.
Keep us informed on your results with the Warner bullets.
Will do. The barrel shipped from Krieger today.
I tested 198 Warner solids in my 300RUM today. The results are not promising.
Th rifle configuration: Krieger 30" 1:8" twist 5R barrel, PT&G trued Remington action with PT&G bolt, AIAX CIP chassis, Jewel HVR trigger. The chamber is SAAMI.
The load tested: 198gr moly-coated Warner solids, 91.0gr Retumbo, Fed 215M primers, COAL 4.070", 0.189" jump, about 3200fps. Once-fired, neck-sized Norma brass.
I fired 3X 5-shot groups at 100 yards with extreme spreads: 1.75", 3.68", and 2.35".
I fired a couple of groups yesterday with a different load which were no better, and a few groups last month with my old 1:10" Bartlein barrel which were also similar.
With the 1:10" Bartlein barrel and 230gr Bergers it shoots about 1/2-MOA. But I did not shoot any Bergers from this barrel because I would have to first throat it for the longer ogive length.
My thoughts: The Warners are secant ogive bullets and not a bore-rider design which would tend to self-center, so I suspect there is too much jump. The gas check band is nearly out of the neck as the bullet hits the lands. The freebore of the SAAMI 300 RUM chamber is .110", so even in a chamber with no freebore this bullet would jump .079" (loaded at 4.070") - but it might be possible to seat the bullet against the lands with most of the gas check band still in the neck and get them to shoot. One question is whether as good velocity would be achieved?
US 869 100 grains, 230 Berger Hybrid. .0015 off. 30 in. 1:10 Bartlein. This is the hammer.
What is the velocity?
Usually settles in at 2800 fps.
Just to finish up the report on my load with Warner 198gr solids. I loaded some rounds at 4.259" COAL which puts the bullet at the lands for a SAAMI chamber. Only about .1" of the pressure band is in the case neck. Two 5-shot groups had .514-MOA and .522-MOA vertical size. So these bullets will shoot if loaded at the lands. Bolt lift had some drag with 91gr of Retumbo, so I will probably back the load off to 90gr 3150fps.
What I plan to do is get a reamer with no freebore which will reduce the COAL to 4.149" with most of the pressure band in the case neck. I'll use this rifle for 1-mile shoots.
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