300 RUM/210 Berger/Retumbo... how many grains do you use?

[MDGrand]

For all you long range guys out there with this combo...

How many grains are you using? According to Berger.. Max grains is 92 and getting 2913 FPS with 26" barrel...

Curious as to what others are getting ... If above 3000 FPS AND shooting 26" barrel let me know what your recipe is.

Thanks!

[get one leakin]

94 grains 180 grain nosler accubonds

[haugenna]

I am using 100.2 grains of Retumbo with 180 accubonds.

[Jamieb]

Those bullets are pretty long. If you load to fit in the mag well then you'll be crunching powder at about 93 gr. I'm loading 95gr under the 208gr A-max and the powder is very compresed, 95.5 under the 200gr accubond is about 100% full, both loaded as long as I can and still fit in the 700's mag. well.

[BULLBLASTER]

I have a Sendero, and am shooting 210 grain bergers over 90 grains of retumbo. this combo gets 2860 out of my rifle and shoots lights out. .5 inch at 100 yards. i have shot to 830 so far and had fabulous results. IMO you dont need 3000 fps. mine are loaded to just fit in the mag. around 3.71 or so.

[MtnMuley]

91 grains.

[MDGrand]

FPS?

[rbros]

93-94gr Retumbo, 210 Berger touching lands.  OAL is 3.780" using a custom chamber though.  3100-3150fps in 26-28" barrels is the norm.  I would probably start down around 91 and work up with a factory rifle.  Seating them at at 3.6" mag length is going to take up quite a bit more room in the case and cause pressure to rise.

[MDGrand]

Thanks for the info, rbros!

According to Berger reload data, max grains for retumbo is 92.. are you seeing any pressure problems using 93-94?

[rbros]

No pressure issues at all, but keep in mind that my OAL is .180" longer than normal specs.  This lowers the pressure alot, even touching the lands.

[BULLBLASTER]

No pressure issues at all, but keep in mind that my OAL is .180" longer than normal specs.  This lowers the pressure alot, even touching the lands.

Coal must have a pretty good impact on pressure as I was showing extractor marks at 91 grains. And groups were double size right at 1 moa. I backed off to 90 for.better groups. Never played with coal any as 1/2 inch at 100 yards is plenty good for me.

[rbros]

COAL has a huge affect on pressures.  Barrel and chamber design will make small differences, but increasing or decreasing COAL will change pressure drastically.

[MDGrand]

I have a factory chamber and my OAL 3.67.. I wish I could load it a bit longer, but the magazine wont feed if the OAL is any longer, damn rounds wont fit! Apparently this is pretty common in Remingtons.  I don't see any pressure signs using RL 25 at 88 grains, I will be chrony'ing the Retumbo load Thursday and report back.. I am hoping for 3100 out of 26" Hart barrel but we will see. If I don't get the same accuracy though then it will be all for nothing. We will see.

[MtnMuley]

I can't remember right off hand, but I'm thinking I was right around 2980 fps with 91 grains.  The 190's shot better at longer ranges out of that gun, so I stuck with that load.

[MDGrand]

Alrighty, so I tried 92.5 grains of Retumbo, Nosler Brass, Fed GMM215 primer and Berger 210 VLD out of my Rem 700 with 26" barrel.. I got about 100 FPS faster vs my old load of RL 25. Average of 3050.

That being said, results were about 1.25 MOA.. where with RL 25 I was shooting clovers.

So.. Im sticking with what I got.

Gonna try the Retumbo with the 200 Grain Nosler Accubonds.. they did not seem to like the RL 25 much, but perhaps with the Retumbo they will be straiten out.