300WM LOAD DEVELOPMENT

[Jagermeister PIP]

Hello all,
I'm working up loads for my Gunwerks LR-1000 300WM using Barnes 175 LRX, H-1000, and Federal Premium Match Large Rifle Magnum primers. 80.9g and .050" off the lands seems to be producing the most consistent velocities. I'm going to test 10 more rounds of this load before I commit and order a new turret for my Nightforce NXS. Do the velocities, extreme spread, and standard deviation all seem to be acceptable for LR hunting?
Thank you for any input.

 

[Dmagna]

I shoot a 215 Berger at 3000fps out of my 26" barrel on a 300wm and H1000. I guess I would be pretty disappointed if I was only shooting a 175 at 3050ish. I would keep going up until you hit pressure signs

 

[Reelamin]

I understand many on this forum load or go with "nodes" or other velocity data. I understand and agree low ES and SD does have an affect on trajectory/group size enough to create a miss or wounded animal at long distance (for me when you start getting out past 600yards). For me the group size average for all of those loads is critical and missing. Without that I could not keep going any direction. My last 300WM I loaded for shoots its best with brass eating pressure so I backed it off a little. It went from one larger hole to in the .1-.2" range. I'm a lot faster/higher pressure than you with H1000 and a 26" barrel.

 

[ShtrRdy]

Have you shot this load for groups and over longer distances?

 

[Reelamin]

Have you shot this load for groups and over longer distances?

Nope not yet with definite measurements. I just finished up load development and sheared a factory scope base screw in the receiver when I was verifying ballistics. I did not shoot or try for groups for specific numbers. It was tight groups....at 500yds.....guessing under 5" from memory, and packing them very well at 725yds when it got loose and I noticed my problem. Gun is at smiths and will either get it out or open them up to 8-40. It really wont matter to me anyway as it is one of my practice guns with practice target bullets and if it holds MOA or less I'll be happy.

 

[Husky user]

Am I missing something or did you get no bump in FPS from 80.5 to 80.9?

 

[Jagermeister PIP]

Have you shot this load for groups and over longer distances?

Not yet.

 

[Jagermeister PIP]

Am I missing something or did you get no bump in FPS from 80.5 to 80.9?

Correct.

 

[asd9055]

For me, IMHO, you are not displaying or gathering enough information to reach any real conclussions.
Why 80.5-80.9? Why not other? where is the target, POI? Group size?

 

[Jagermeister PIP]

For me, IMHO, you are not displaying or gathering enough information to reach any real conclussions.
Why 80.5-80.9? Why not other? where is the target, POI? Group size?

Here is all the data and loads. 80.5 and 80.9 looked the most promising with 5 shot groups so thats why I loaded more to investigate further. I have only put them over the chrono so far. Paper will be next.

 

[Husky user]

Still hard to believe you are not seeing increase in FPS when you increase powder charge.
I have two pet loads for my 300WM with 180 gr Nosler Accubond. 24" barrel 1-12
80gr Reloader 26=3130 75gr Reloader 22 =3110 both with 215M.
Both very accurate

 

[asd9055]

Here is all the data and loads. 80.5 and 80.9 looked the most promising with 5 shot groups so thats why I loaded more to investigate further. I have only put them over the chrono so far. Paper will be next.

Personally I would not go off just ES and SD. If I were to use so many rounds to select a load, I would have done a round robin ladder combined with MV and POI (need to see targets)
I also agree with @Husky user . No MV change with more powder?

 

[West Calamus]

You left out a lot of info. 1 st fired brass? you can get up to 100 fps velocity gain in 300 WM once brass is fired formed.How many shots down the tube? Gunwrecks use pretty good barrels and the velocity will start to pick up around 300 shots down the tube. You are only jumping up .2 grains at a time and on a extruded powder you will not notice any velocity change like you would on a ball powder. Increase your loads on H1000 .8 grains when ladder testing. I have gotten 3,150 fps with 78.5 of H1000 on a 175 gr sierra HP. I Use IMR 4831 now on 300 WM on 175 gr Sierras since it is easier to find and get 3,200 fps with virgin Peterson brass.

 

[ShtrRdy]

I wouldn't order a new turret until I could confirm accuracy is what I want. IMHO, consistent accuracy is better than small ES and SD.