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300WM Faster Than Expected

jstanton said:
Berger says 1:11 or faster and I'm running a 1:10 twist. This gun may very well not like the H1000 or Bergers but my SD and ES are pretty good at 75.2 and 75.5. Will see if seating depth can close up that group.
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Berger bullets are very tricky to tune. That's all I shoot. In my 308s 0.160" off the lans was the spot. And they don't go to sleep until pass ~300yds. The group at 100yds (1.0") is the same at 500 yds: 1.0". So that's about a 0.2 to 0.3 MOA! Enjoy the journey 🤓 That's for the 168gr VLD.
 
Husky user said:
I have a 300 WM in a Husqvarna 9000 with a 1-12 twist.
That is what the Nosler #1 book says.
I have only Crono-ed it one time years ago ,but 75 gr of RL22 produced 3110fps.(180 gr Nosler Partition)
At the time that seemed faster than I expected!
Click to expand...
Out of respect to the OP (@jstanton), you might want to consider a separate thread for your specific query and yield results dedicated to your issue/concern and not get mixed up or buried on this thread. Good luck!
 
cohunt said:
Berger load data doesn't use adg brass--- iirc adg recommends dropping a full grain of powder when using their brass

Here is a quote from their website :
" With the additional material, our brass is heavier than most other manufacturers brass and therefore will require lower charge weights to achieve the same pressures and velocities due to the reduced volume inside the brass"
Click to expand...


I have wondered why the berger book always seemed to be a bit on the conservative side with their load data.
This may be the reason...?
 
jstanton said:
So, for those who commented on my Bone Head Mistake thread, I did not use the blended H1000/H4831SC for what I'm about to say!😁

Doing load development on a factory Christensen Ridgeline, after following factory break in procedure using factory Hornady 180gr Superformance ammo. I loaded up some 210gr Bergers in new ADG brass, Federal 215 LRM primers, .040" off lands, .002" neck tension, and a new 1lb can of H1000. Berger book says max load 75.5 at 2804fps, I know it's not always gonna match but it's a good average expectation.

Shooting conditions: Temperature 60⁰F, Humidity 25%, Elevation ~500', Wind 8mph WNW.

5 Shot groups, measure speed with Garmin Xerox C1

Charge Avg FPS SD ES
74.7 2894.5 8.0 22.0
74.9 2904.8 6.9 20.4
75.2 2925.1 5.3 14.8
75.5 2928.1 4.6 14.3
75.8 2938.5 17.5 49.4

All shots grouped horrible but there seems to be a decent node at 75.2 and 75.5 but those groups were 1.5"-2" though.

First I'm curious as to why my results are so much faster than book? Never had any signs of pressure but maybe a slightly sticky bolt on the 75.8 group. Was hard to tell as the action on this Christensen is a little tight naturally after a fired round. Second can I wrangle this load in by adjusting seating depth?

I know all rifles are different but I have a Bergara 300wm that loves this recipe so I used it as a starting point. With that rifle, doing seating depth tests, the worst groups were around .80"-1.0" and when I finally settled on .040" off the lands I could get .50"-.60" groups as long as I did my part with 75.8gr of H1000.
Click to expand...
Not saying your issue reflects mine, but I'll tell you about my one and only experience with a Christensen. I bought an ELR about a year ago and did a work up with N570 and 225 ELDM. At 79.5 I hit 3,076 FPS. Should not be possible. I tested other bullets and always achieved crazy speed but the best group I ever got was about an inch. Don't know what caused it, didn't stick around to find out. Never again will I buy a Christensen
 
jstanton said:
So, for those who commented on my Bone Head Mistake thread, I did not use the blended H1000/H4831SC for what I'm about to say!😁

Doing load development on a factory Christensen Ridgeline, after following factory break in procedure using factory Hornady 180gr Superformance ammo. I loaded up some 210gr Bergers in new ADG brass, Federal 215 LRM primers, .040" off lands, .002" neck tension, and a new 1lb can of H1000. Berger book says max load 75.5 at 2804fps, I know it's not always gonna match but it's a good average expectation.

Shooting conditions: Temperature 60⁰F, Humidity 25%, Elevation ~500', Wind 8mph WNW.

5 Shot groups, measure speed with Garmin Xerox C1

Charge Avg FPS SD ES
74.7 2894.5 8.0 22.0
74.9 2904.8 6.9 20.4
75.2 2925.1 5.3 14.8
75.5 2928.1 4.6 14.3
75.8 2938.5 17.5 49.4

All shots grouped horrible but there seems to be a decent node at 75.2 and 75.5 but those groups were 1.5"-2" though.

First I'm curious as to why my results are so much faster than book? Never had any signs of pressure but maybe a slightly sticky bolt on the 75.8 group. Was hard to tell as the action on this Christensen is a little tight naturally after a fired round. Second can I wrangle this load in by adjusting seating depth?

I know all rifles are different but I have a Bergara 300wm that loves this recipe so I used it as a starting point. With that rifle, doing seating depth tests, the worst groups were around .80"-1.0" and when I finally settled on .040" off the lands I could get .50"-.60" groups as long as I did my part with 75.8gr of H1000.
Click to expand...
Howdy, you are right there with what I have with the same rifle.
With only around 80 shots on my barrel, so I believe it will get a little faster.
I settled on H- 1000 76.6gr
Peterson long brass 2nd fired
CCI250, 3.590. mag.length 3.600, 45thou.
Off lands. Settled on 2920fps
215 Hybrid . 1/2 moa out to 300yds.
Hope this helps. 👍🎅
 
MTbackwoods said:
Not saying your issue reflects mine, but I'll tell you about my one and only experience with a Christensen. I bought an ELR about a year ago and did a work up with N570 and 225 ELDM. At 79.5 I hit 3,076 FPS. Should not be possible. I tested other bullets and always achieved crazy speed but the best group I ever got was about an inch. Don't know what caused it, didn't stick around to find out. Never again will I buy a Christensen
Click to expand...
This is what I have found as well. I would never own another Christensen again.
 
I also agree with the ADG brass. I have ADG, Lapua and Peterson Brass for my 3 different 300 PRCs. 81gr N570 behind a 245 EOL gets pretty different results across the 3 barrels, even between the 2 proofs.

I would note that reloading manual Max charges aren't max for all rifles, they're below true maximum pressures to account for differences in components, equipment and firearms. There isn't a one size fits all; and the companies making the manuals have to cover themselves from legal retribution.

Also, I've had rifles shoot much slower at book max and much faster at book max.

Be mindful of the ADG brass as it doesn't show pressure as early on as Lapua and other softer brass. I love that ADG brass.
 
Last edited:
MagnumManiac said:
It wouldn't have made a hoot of difference if you did.

As to your velocity, I have 5 300WM rifles, all of them get 2950-2990fps with 210's & 215's without any issues, my Rem 700 LR gets 3010fps with Berger 210g VLD, this rifle is always faster and likes slower powders.

Cheers.
Click to expand...
This.
I have loaded for a bunch of 300WMs w. 210-215s. Almost all are in the 75.5-77.2gr H1000 @ 2930-2990 from 26" barrels.
 

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