215 Bergers in 300 RUM with 26" barrel

[bitbythebug]

I did the dummy round and it measured 3.87. So, to make sure that I understand, I would start with a greatly reduced load at 3.865 and move back 3.860, 3.855 etc. until the accuracy spikes and then work the powder up to velocities that it is still accurate but closer to maximum?

 

[barefooter56]

I did the dummy round and it measured 3.87. So, to make sure that I understand, I would start with a greatly reduced load at 3.865 and move back 3.860, 3.855 etc. until the accuracy spikes and then work the powder up to velocities that it is still accurate but closer to maximum?

bitbythebug,
Yes.

 

[Edd]

Regarding accuracy, can someone explain why the rifle cares how far the bullet is from the lands?

 

[barefooter56]

Regarding accuracy, can someone explain why the rifle cares how far the bullet is from the lands?

Edd,
It has to do with tuning the seating depth and the load ( velocity) so that the bullet leaves the barrel at the same point of flex every time = harmonics. Matching these up to what the rifle likes gives you a flat ( or relatively flat) waterline like group on your target that is best for long range accuracy.

 

[bitbythebug]

Took my reloading equip. to the range today and reloaded and shot. Tried 3 shot groups starting at 3.85COAL and worked back. It seemed to get real accurate around 3.825 and I could shoot .5moa groups at 200 yds with light loads. So I started upping the powder and the accuracy went away when I approached 3000fps. I only had R_P brass today and I hope that is most of the reason. I will take Nosler's out next time to see if that can be improved upon, but for now I am still fairly lost trying to make my gun shoot the 215's.

 

[barefooter56]

Took my reloading equip. to the range today and reloaded and shot. Tried 3 shot groups starting at 3.85COAL and worked back. It seemed to get real accurate around 3.825 and I could shoot .5moa groups at 200 yds with light loads. So I started upping the powder and the accuracy went away when I approached 3000fps. I only had R_P brass today and I hope that is most of the reason. I will take Nosler's out next time to see if that can be improved upon, but for now I am still fairly lost trying to make my gun shoot the 215's.

bitbythebug,
What were the grain weight(s) you were increasing your load by?

 

[bitbythebug]

Got up to 89 gr of RL25 and 90 gr of Retumbo. There was negligible difference between 88 gr and 89 gr of RL25

 

[Lrt307]

I have a very similar gun. Blueprinted 700 rem 300 ultra wyatts box 3.825 hs bedded stock brux 26 barrel side discharge brake timney trigger. My gun is a 1 hole monster with 90.0 grains of h1000 and comparator length of 3.105 or total length of 3.875. The problem is it is now a single shot @ that length. So I tried pushing bullet in case and my speeds dropped by 50fps and lost psi and accuracy. I then loaded up and got my speeds back but have not yet found anywhere near the accuracy. I have some more testing to do this weekend.

 

[Lrt307]

Well this am I shot 91 grains of h1000 91.5 h1000 and 92 h1000. 215's were all .095 off lands. 91 was 1.1" group @ 100yds. 91.5 was .821" and 92 was .416. None of the loads showed any concerning psi. I also did a ladder test @ 100 yds with my huskemaw. The 3 groupd were .484 .507 and .801 the scope tracks real close to advertised. Tomorrow am I will shoot 1050 yds and verify data 400 500 600 690 750 and 1050. Speeds were all right around 3088 to 3098 fps. Pretty good deviationI will verify speeds in am @ long range.

 

[bitbythebug]

i AGAIN WENT TO THE RANGE AND i HAVE CONCLUDED THAT THE 215'S ARE VERY ACCURATE BUT ONLY BELOW 3000FPS. I looked in the Nosler book and all of their most accurate loads were reduced loads in nearly every powder. If I keep it under 3000fps It is very accurate. I bought a Sako model 75 this summer that had been rebarreled and accurized in 300 rum and the guy I bought it from had the same experience with that gun and I eventually sold it because it would only shoot under 3000fps and I wanted more. I think I now know why he abandoned it. I am beginning to think that the extra powder capacity in the rum is only that, extra powder capacity and that it is only available to you if you want to sacrifice extreme accuracy.

 

[Lrt307]

Read the above post. You must need to load the gun up more if you are struggling. You must realize that books with load data that have minimum and max load data should be taken with a grain of salt. Published info almost always has a safety zone and the info you read doesnt get you where you want to be for speed or accuracy. Its like anything else if you are an experienced reloader / shooter you will work up and find your max loads that will not be published in books. I have tons of targets sub .5 moa with 300 rum shooting 185 bergers 3400+ fps and tons of 215 @ .5moa. I guess this is where I totally disagree about your statement above on the rum extra case capacity being a waste. Show me a 300 win that will come remotely close to my 185 doing 3407 sub .5moa and I will flip.

 

[Barrelnut]

i AGAIN WENT TO THE RANGE AND i HAVE CONCLUDED THAT THE 215'S ARE VERY ACCURATE BUT ONLY BELOW 3000FPS. I looked in the Nosler book and all of their most accurate loads were reduced loads in nearly every powder. If I keep it under 3000fps It is very accurate. I bought a Sako model 75 this summer that had been rebarreled and accurized in 300 rum and the guy I bought it from had the same experience with that gun and I eventually sold it because it would only shoot under 3000fps and I wanted more. I think I now know why he abandoned it. I am beginning to think that the extra powder capacity in the rum is only that, extra powder capacity and that it is only available to you if you want to sacrifice extreme accuracy.

If both of you experienced the same issue, there must be something to it. In this case I would just go to the 210 VLD. Accuracy is most important, in my mind anyway. You stated earlier that the 210s are very accurate. I run the 210s at 3150 fps in my 300 RUM and it really does shoot in the .2 and .4 range. I'm not willing to give that up for a 215 at all. Maybe bump up to the 230s if the highest BC is your holy grail.

 

[Lrt307]

If both of you experienced the same issue, there must be something to it. In this case I would just go to the 210 VLD. Accuracy is most important, in my mind anyway. You stated earlier that the 210s are very accurate. I run the 210s at 3150 fps in my 300 RUM and it really does shoot in the .2 and .4 range. I'm not willing to give that up for a 215 at all. Maybe bump up to the 230s if the highest BC is your holy grail.

You can lead a horse to water......but you can't make him drink it.

 

[bitbythebug]

my best accuracy was between 3.83 and 3.85 coal which makes mine a single shot.