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300 RUM with 210 BERGERS

 
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  #1  
Old 09-25-2010, 04:11 PM
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300 RUM with 210 BERGERS

I'd like to post some info here for whatever help it may be to others and also would like to hear any comments about the meaning of the data and which load you would use for long range hunting.


RETUMBO W/210 BERGERS IN 300 RUM, ALL GROUPS WERE 3 SHOTS. 28-INCH KRIEGER BARREL. BARREL WAS NOT CLEANED DURING TESTING.

91 GRS. 3,034 FPS ES 37 SD 15.10, GROUP SIZE - .705

92 GRS. 3,019 FPS ES 32 SD 14.85, GROUP SIZE - .484

93 GRS. 3,099 FPS ES 32 SD 14.24, GROUP SIZE - .496

94 GRS. 3,099 FPS ES 42 SD 17.46, GROUP SIZE - .175

95 GRS. 3,133 FPS ES 43 - SD 17.75, GROUP SIZE - .715

96 GRS. 3,168 FPS ES 62 SD 26.15, GROUP SIZE 1.291
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Old 09-25-2010, 04:34 PM
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Re: 300 RUM with 210 BERGERS

Thanks for the work in putting the data together.
However, I would still try for lower ES.
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Old 09-25-2010, 04:44 PM
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Re: 300 RUM with 210 BERGERS

Quote:
Originally Posted by Gary Morgan View Post
I'd like to post some info here for whatever help it may be to others and also would like to hear any comments about the meaning of the data and which load you would use for long range hunting.


RETUMBO W/210 BERGERS IN 300 RUM, ALL GROUPS WERE 3 SHOTS. 28-INCH KRIEGER BARREL. BARREL WAS NOT CLEANED DURING TESTING.

91 GRS. 3,034 FPS ES 37 SD 15.10, GROUP SIZE - .705

92 GRS. 3,019 FPS ES 32 SD 14.85, GROUP SIZE - .484

93 GRS. 3,099 FPS ES 32 SD 14.24, GROUP SIZE - .496

94 GRS. 3,099 FPS ES 42 SD 17.46, GROUP SIZE - .175

95 GRS. 3,133 FPS ES 43 - SD 17.75, GROUP SIZE - .715

96 GRS. 3,168 FPS ES 62 SD 26.15, GROUP SIZE 1.291
For long range shooting/hunting you are looking for the lowest SDs, Best group and most consistant load combination.

It looks like your rifle likes the 94 grain load + or - . and the fact that the velocity did not
increase from 93 to 94 grains would indicate a change in primers may be nessary.

Also I would recomend that you clean between each group for more consistant data. (clean,
shoot one fouling shot and then shoot the 3 shot test load). repeat this each time because
as the barrel fouls the data will become less viable.

Lower standard deviations will give you less elevation error at longer distances . so try to
lower them to somewhere arround 10 or 12 or lower.

Once you get the best consistency of velocity.SDs and groups then experiment with bullet
seating depths for the ultimate load.

Just a recommendation.

J E CUSTOM
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Old 09-25-2010, 05:33 PM
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Re: 300 RUM with 210 BERGERS

Just an fyi, my 300RUM load with 210's and Retumbo (factory 26" barrel) is 94.7g at just under 3K acc'd to exbal using Litz's bc numbers, but about 3020fps with my chrono. It is very consistent.

Edit: Got called away and couldn't finish this post...

-.010 and ~3.845 OAL and FED 215M. Interesting that your 94g load grouped best and that's close to where I am. Might be a sweet spot with the RUM and 210's.

That ES is quite odd. What are your reloading techniques--close to or essentially benchrest techniques I'm guessing?
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Last edited by jmden; 09-25-2010 at 06:54 PM.
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Old 09-25-2010, 06:41 PM
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Re: 300 RUM with 210 BERGERS

J E Custom, thanks for your response. I am curious what primer you would suggest I change to. I am using the Federal Gold Medal Match Magnum primer. I thought it was odd that the 91 grain charge was faster than the 92 grain load, and then 93 and 94 shot the same speed.

I have the bullets about .010 into the lands, and I was anticipating maybe getting 3,200 FPS out of the 28-inch barrel. I wonder if I should try moving the bullet back off the lands to hopefully gain a little velocity.

What do you think?
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Old 09-26-2010, 10:10 AM
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Re: 300 RUM with 210 BERGERS

Quote:
Originally Posted by Gary Morgan View Post
J E Custom, thanks for your response. I am curious what primer you would suggest I change to. I am using the Federal Gold Medal Match Magnum primer. I thought it was odd that the 91 grain charge was faster than the 92 grain load, and then 93 and 94 shot the same speed.

I have the bullets about .010 into the lands, and I was anticipating maybe getting 3,200 FPS out of the 28-inch barrel. I wonder if I should try moving the bullet back off the lands to hopefully gain a little velocity.

What do you think?
I think you are on the right track with 94 grains of Retumbo. there seems to be a lot of RUMs
that like this load. go up or down in 2/10ths grain increments and you will find the NODE.

I all start with the bullet farther away from the lands so that I can find the MAX load without
any problems and then adjust the seating depth to tweak the load.

I would back off to .020 to .025 to start with and try that first. I like the 215 M but would
try a 91/2 rem primer or a 215 (NO Match) they are a little hotter so watch for pressure
signs.

The other thing that could be effecting SDs is bullet grip . check neck thickness and if it varies
you need to turn them for a more consistant grip on the bullet.

For best results only make one change at a time or you may mask a really good load potential.

The RUMs are very forgiving and load development should go fast if you are careful to keep
tract of any changes.

The only problem I have with the Retumbo is that it can become critical (Over pressure) very
easy and case density is not where I like it.(I prefer 99 to 100%) but it does have it's following.

Just some thoughts.

J E CUSTOM
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  #7  
Old 09-26-2010, 05:09 PM
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Re: 300 RUM with 210 BERGERS

+1 with the neck tension observation. I was a doubting Thomas until I started working with a PPC for 100 and 200 yd BR. I can tell you I don't miss case prep chores since leaving the game.

I have to agree with J E Custom again with his choice of primer. If it's Retumbo, for me it's the 215 non M. My experiance has been with 200gr Noslers,as opposed to the Bergers though.
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