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300 RUM with 230 OTM's

 
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  #1  
Old 08-26-2013, 08:46 PM
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Location: Christiansburg, VA
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300 RUM with 230 OTM's

Finally got back on the reloading bench with trying to fine tune my initial test loads that were, eh, mediocre. I took the best 2 loads and tweaked them, with a new box of Bergers, new lb of powder, and 1x fired brass. Lets just say, I am pleased. I ended up with 2 loads that produced 1/2MOA groups. I am not sure of velocity as I don't have chrony, I can get access to one at a later date to calculate ES.

The two loads that produced the 1/2" groups, are seated closer to the lands (will not fit in mag) than my original 230 OTM test loads. I've shot it single shot for the past few years so this doesn't bother me too much. Both loads are identical except for powder charge. Would I consider this my "node"?

I will take some pics of the target tomorrow, I have a few questions about my groups and suggestions for improving.

This rifle has proven to be a shooter, shooting a 4" group at 500 with 6-10MPH winds coming from multiple angles. While at the range, I also shot a 3 shot group with my older 185 VLD's, It produced one hole. This combo has produced some great groups in the past, but not quite this good. I decided if the first 3 shot in the same hole, I'd try a 5 shot group for bragging rights. Well, I should have stopped at 3. Hot barrel (I was excited) and probably rushing the shot, opened the group up to around 1MOA.

I will post some pictures, hopefully tomorrow, for some constructive criticism. I normally shoot 2 shot groups in initial load development, my theory is because if the first 2 shots are 4" apart, a 3rd shot isn't going to make the group shrink. After I tweak these loads, I will then go to 3 shot groups to validate and shoot at either 200 or 300 yards.

I know there's not a lot of load data/information out there on the 230's with the RUM, so I wanted to track my testing and results as I go for others to learn.

Edit to add: 230gr Bergers out of a 9lb rifle without a break can be punishing at the bench, but they sure to make one hell of a wallop in the backstop!
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  #2  
Old 08-28-2013, 07:40 PM
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Re: 300 RUM with 230 OTM's

Ok, here are the groups. First pic is overall target view. You can see T3 and T4 are my 1/2MOA groups I'm excited about. (better than the 8" groups out of 338 with 250 OTM's).

300 RUM with 230 OTM's-230-otm-target.jpg


The second pic is the 1/2MOA group (near zero vertical string).

Name:  230 OTM  0.5MOA group.jpg
Views: 0
Size:  4.4 KB

The third pic is the second 1/2MOA (actually just over 1/2) group fired. The barrel was allowed to cool 10-15 minutes between groups, but shots within the same group were fired back to back. (+/- 30 seconds between shots).

Name:  230 OTM 0.5 MOA group 2.jpg
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Size:  2.7 KB

You can see that groups 1,2, and 5 are "ok", just not steller. I shot at different aim points as I wasn't able to walk to the target after each group and label bullet holes. Thats the one bad thing about public ranges.

Ok, here's the 5 shot group, shot #4 could have been pulled, as the crosshairs were not perfect when the trigger broke. shot 5 was perfect sight picture, factory sporter barrel was quite warm after 4th shot, I just wanted to see what a 5 shot string would look like.

300 RUM with 230 OTM's-185-vld-5-shot-group.jpg

Lets here it guys, should I try to improve the T3 load or just load some up to verify it wasn't an accident, and start figuring out drops?

TB
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  #3  
Old 08-29-2013, 10:05 AM
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Join Date: Feb 2012
Location: eastern,wa
Posts: 442
Re: 300 RUM with 230 OTM's

T4 looks a little smaller than 3, was that up or down in powder? If it were me i would try 3/10th powder charge change which ever way t4 was from t3 and see if it tightens up a bit more. Otherwise nise groups. That should be a hammer.
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  #4  
Old 08-29-2013, 01:35 PM
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Join Date: Sep 2012
Location: Christiansburg, VA
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Re: 300 RUM with 230 OTM's

T4 actually measures right at 0.6" and t3 is right at 0.5. I doubt it'll make much difference. T4 has 0.5gr more powder than t3. From memory, t3 is 90.0gr and t4 is 90.5gr H1000.

I might try 90.3 gr. in such a big case, it may and it may not change.

It is a brute, hopefully it will continue to print groups like these and hold sub MOA out to 650-700 yds.

Calib, thanks for your input!

TB
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  #5  
Old 08-29-2013, 02:03 PM
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Location: eastern,wa
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Re: 300 RUM with 230 OTM's

If 3 is smaller then try .3 under that if you are in search of better than half if you like what you have stay with it
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  #6  
Old 08-29-2013, 10:32 PM
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Join Date: Sep 2012
Location: Mojave Desert, Nevada
Posts: 271
Re: 300 RUM with 230 OTM's

I just bought 3 boxes of Berger 230 gr. Tactical Hybrid bullets for my HS Precision/Rem .300 Win Mag.

Haven't loaded them yet but I expect good results in winds and good downrange velocity (still supersonic) beyond 1,000 meters.

Your 300 RUM can shoot heavier bullets but I believe these ARE the heaviest .30 caliber bullets made.
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  #7  
Old 08-30-2013, 08:30 AM
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Re: 300 RUM with 230 OTM's

Quote:
Originally Posted by Eastcoastshooter375 View Post
Finally got back on the reloading bench with trying to fine tune my initial test loads that were, eh, mediocre. I took the best 2 loads and tweaked them, with a new box of Bergers, new lb of powder, and 1x fired brass. Lets just say, I am pleased. I ended up with 2 loads that produced 1/2MOA groups. I am not sure of velocity as I don't have chrony, I can get access to one at a later date to calculate ES.

The two loads that produced the 1/2" groups, are seated closer to the lands (will not fit in mag) than my original 230 OTM test loads. I've shot it single shot for the past few years so this doesn't bother me too much. Both loads are identical except for powder charge. Would I consider this my "node"?

I will take some pics of the target tomorrow, I have a few questions about my groups and suggestions for improving.

This rifle has proven to be a shooter, shooting a 4" group at 500 with 6-10MPH winds coming from multiple angles. While at the range, I also shot a 3 shot group with my older 185 VLD's, It produced one hole. This combo has produced some great groups in the past, but not quite this good. I decided if the first 3 shot in the same hole, I'd try a 5 shot group for bragging rights. Well, I should have stopped at 3. Hot barrel (I was excited) and probably rushing the shot, opened the group up to around 1MOA.

I will post some pictures, hopefully tomorrow, for some constructive criticism. I normally shoot 2 shot groups in initial load development, my theory is because if the first 2 shots are 4" apart, a 3rd shot isn't going to make the group shrink. After I tweak these loads, I will then go to 3 shot groups to validate and shoot at either 200 or 300 yards.

I know there's not a lot of load data/information out there on the 230's with the RUM, so I wanted to track my testing and results as I go for others to learn.

Edit to add: 230gr Bergers out of a 9lb rifle without a break can be punishing at the bench, but they sure to make one hell of a wallop in the backstop!
Depending on your OAL, its a simple matter to install a Wyatts extended magazine box to allow up to 3.800" OAL ammo to be used in your rifle, I assume its a Rem 700 but I guess I should not as there are several different rifles chambered for the 300 RUM.

I install my PK muzzle brakes on more RUMs then any other factory chamberings. With a good muzzle brake, the rifle will actually feel like its pulling away from the shooter. Once guys get a good brake installed, they generally are mad they put up with the recoil for so long. Not only that but spotting your own shots at longer ranges becomes easy as well, a huge confidence builder.

These would be two good upgrades for your rifle. Shooting it single shot is not a huge problem either but if you want a repeater, there is likely a way to do it.
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