300WM/Berger 210/H1000 Reloading Issue

[SES50]

I started putting a new load together for my 300WM a while back to reach out a little farther than my old load and I fired it for the first time this week. The results are a little confusing. Maybe some of you can help me out.

When putting the load together I looked in three different books and interpolated between the 200 and the 220 loads to get the powder charge for the 210. This is what the books read:
1) Lee Modern Reloading Second Edition

200 Grain Jacketed Bullet
H1000 - Min 74.0 - 2723 FPS
Max 79.0c - 2883 FPS

220 Grain Jacketed Bullet
H1000 - Min 73.0 - 2597 FPS
Max 78.0 - 2750 FPS

So I get for 210 Grain Bullet 73.5 - 78.5 Grains of powder from this book.

2) Barnes Reloading Manual Number 3

200 Grain Bullet
H1000 - Min 72.5 Grains - 2516 FPS
Max 77.5 Grains - 2689 FPS

3) Speer Reloading Manual Number 13

200 Grain Bullet
H1000 - Min 73.0 Grains - 2629 FPS
Max 77.0c Grains - 2797 FPS

So I loaded up 5 rounds of each load between 76.0 - 78.5 in half grain intervals to see what I got. My crono did not read every round fired but I got some readings for every shot fired. Also all the brass showed high pressure signs with the primer pushed out flat and one case actually having the head pop off after it was back in my reloading bullet carrier box.

Here are the speeds I recorded:
78.5 Grains
2930
2936
2936
2962
2962

78.0 Grains
2962
NR
NR
NR
2898

77.5 Grains
NR
2917
2861
2892
2892

77.0 Grains
2861
2879
2873
2867
2886

76.5 Grains
2930
2949
2982
2976
2996

76.0 Grains
NR
2949
NR
2917
2969

So the interesting thing is that the velocities start high then drop down as the powder goes down in volume and then the velocities increase again. I am shooting these out of a 26" barrel on a T/C Encore and the velocities seem really high with what I compare to the velocities the book says I should be getting. If I figure every inch of extra barrel adds about 50 FPS these bullets should not be going this fast.

These loads are not crimped and are .010" off the lands. I am using GM215M primers and I trickled every powder load so I believe the powder weight is dead on. Also the 78.5 Grain load had the best group at a little over .5 MOA.

So, can anyone explain to me why I am getting the cases falling apart and the primers really pushed out? And why do I have the strange velocity fluctuations? Anyone else using H1000 in a 300WM?

Thanks
SES

[300winnie]

I have a load worked up for my Browning Stainless Stalker with a 26" tube that pushes the 200 grain Accubond at an average of 3,038 fps and 80.5 grains of H1000 that doesn't overly work my brass. My loads are seated .030 off the lands and accuracy is sub m.o.a. I took my loading information out of the Hodgdon #26 Manual. Just looking at the information I wouldn't think you were out of line, but the gun is obviously telling you otherwise. As far as the velocity issues...you've got me, I don't have a clue.

[Eaglet]

SES50,
What kind of chronograph are you using?

[SES50]

Competition Electronics ProChrono Digital Chronograph

[Eric Stecker]

SES,

I can provide some assistance but for the best help I recommend that you contact Walt Berger directly at bergerltd@aol.com. Walt is the best person to provide you with assistance even if it is not related to the bullet.

Regarding the various loads listed in the manuals, we are putting our manual together right now and have been doing considerable research on the subject of loading data. We have learned that no two manuals are alike because different lots within a particular type of powder will vary considerably. In fact, powders can change places on the burn rate chart due to this inconsistency.

You may have a lot that is hotter than those tested when the manuals were created. If this is the case in your situation then you can see why loading manuals will tend to list loads that are conservative.

It is possible that something else is causing your situation which is why I am suggesting you get Walt involved.

Regards,
Eric Stecker
Berger Bullets

[SES50]

Eric,

Thanks for the info. I will give him a call when I get a chance in the next couple day. Is there anytime during the day that would be best? Is there any possiblility that you could drop a print out of this on his desk so he can take a look at it before I call?

I appreciate the advise.

Thanks
Sherman

[LRHWAL]

I was provided with data by Walt Berger within a day or so of dropping Berger's helpline an e-mail on the website

The data as developed on quick load and for a 26" barrel with H1000 was:

72.5 gr - 2689fps
76.2 - 2836 fps (maximum load).

I suggest you get in touch with them directly, and certainly I don't accept responsibility for this data.

In short - that says your load may be too high. Certainly your cases are telling you that. We often don't know "why".

I'm sometimes surprised by the numbers some guys get and claim are not "over pressure" when we have no real way to measure. I use a chronograph and if I get more velocity than I figure I should I accept that it's probably over pressure.

I don't question that you get "fast barrels" and diameter differences that can affect this, but that's how I would see it.

With South African powders 210 Bergers at 2850 in my 300WM (26") are where I'm comfortable and 2900 was pushing it. I often wonder if the 50 or 100 fps really makes any appreciable difference and why we "chase it" (not saying you are, just commenting).

I we really NEED more speed we should buy bigger guns. I fall into this from time to time - not saying I'm immune, but I'm having a lucid moment, so commenting on it.

I hope that data helps some. I've got it for other US powders too if need be, but as Eric said - go to Berger's site directly and they'll hook you up with data.

Wim
(SA)