300wm load help please

[Edinburgh Rifles]

Your node is throwing 1.5" at 100m?
I would argue that if the ES is high and the accuracy potential is not sub MOA then keep looking at OCW for a better combination

We are developing a load for a 300wm at the moment
Our theoretical initial development produced 3/4” at 100m and a similar ES of 15fps

Arguably could be significantly better as it was shot off a bonnet!

 

[Muir]

Crimp (Lee FCD) and seat to factory recommended over all length. -Muir

 

[muddy216]

Your node is throwing 1.5" at 100m?
I would argue that if the ES is high and the accuracy potential is not sub MOA then keep looking at OCW for a better combination

We are developing a load for a 300wm at the moment
Our theoretical initial development produced 3/4” at 100m and a similar ES of 15fps

Arguably could be significantly better as it was shot off a bonnet!

Hi Ed

This was a velocity node from my initial 15 round velocity ladder. had a very good flat spot over 3 different charge weights. Went straight in the middle of the velocity node and loaded 10 rounds hoping to get a small ES and SD but doesn’t seem to be the case.

Think a restart is in order with possibly new brass and prep that as a start.

Be very interested to know your planned load

 

[DEVON _ DEERSTALKING]

Understand the "Rabbit Hole" effect but why the NEED to get ES down?
Have you actually tried these at range?
ES is a niggle that does not always impact group size or accuracy at range

My 300Norma Mag loads are significantly bigger ES and proven 0.5MOA at 1000m

Given everything you have listed I would personally be looking at Neck tension
Anneal.
Run an Expander Mandrel through them all
Outside neck turn to standardise neck wall thickness. Your Outside neck bushing is very precise but not if the neck is variable thickness or not concentric

Perfectly said iv done this and it made a big difference for me

 

[NP435]

Powder fizzling out? Any push from expanding gas ends once the projectile leaves the bore.

 

[Rutland lad]

I have a very accurate 300 WM homeload, but it’s using a 180 grain bullet not a 150, and it’s just under 3,000fps which I think is fast enough.
May I ask why you’ve gone for a 150 grain bullet ? In my WM experience (may be limited compared to others) I see people using not less than 165 and up to 220 grain bullets. All seem accurate loads.

 

[muddy216]

I have a very accurate 300 WM homeload, but it’s using a 180 grain bullet not a 150, and it’s just under 3,000fps which I think is fast enough.
May I ask why you’ve gone for a 150 grain bullet ? In my WM experience (may be limited compared to others) I see people using not less than 165 and up to 220 grain bullets. All seem accurate loads.

it’s a 178 gr bullet I’m loading the 150 were factory

 

[markyw]

I have a very accurate 300 WM homeload, but it’s using a 180 grain bullet not a 150, and it’s just under 3,000fps which I think is fast enough.
May I ask why you’ve gone for a 150 grain bullet ? In my WM experience (may be limited compared to others) I see people using not less than 165 and up to 220 grain bullets. All seem accurate loads.

Coincidentally, the GRT OBT node #5 values for the 178gr ELD-X gives a velocity just under 3000fps...

Regards

Mark

 

[Rutland lad]

it’s a 178 gr bullet I’m loading the 150 were factory

I’m not keen on putting load data up in a public forum but if you wish to know more DM me.

 

[Sandyb]

I’m not keen on putting load data up in a public forum but if you wish to know more DM me.

Likewise.. I shoot Sierra 175 TMK’s out of mine, being a 27” barrel TRG42. Peterson brass, Remington primers, Viht N160, getting just over 3000 fps. this was a session a couple of weeks back at 1000 yards..

I don’t use the die expanders, but use a sizing mandrel instead for all my calibres now. You’ll never experience a stuck case ever again

 

[Sandyb]

Likewise.. I shoot Sierra 175 TMK’s out of mine, being a 27” barrel TRG42. Peterson brass, Remington primers, Viht N160, getting just over 3000 fps. this was a session a couple of weeks back at 1000 yards..

I don’t use the die expanders, but use a sizing mandrel instead for all my calibres now. You’ll never experience a stuck case ever again

Correction.. getting just over 3100 fps.. it won’t let me edit my post

 

[Rutland lad]

Likewise.. I shoot Sierra 175 TMK’s out of mine, being a 27” barrel TRG42. Peterson brass, Remington primers, Viht N160, getting just over 3000 fps. this was a session a couple of weeks back at 1000 yards..

I don’t use the die expanders, but use a sizing mandrel instead for all my calibres now. You’ll never experience a stuck case ever again

You’re the second person I’ve come across lately using Peterson brass in the 300 WM.
Do you rate it as good as or better than LAPUA ?

 

[Sandyb]

You’re the second person I’ve come across lately using Peterson brass in the 300 WM.
Do you rate it as good as or better than LAPUA ?

I can’t comment as bought Peterson brass back in 2018.. Enough of it, that I’m only on my 3rd or 4th firing.. Back when it was affordable and readily available in the UK.
I do use Lapua for my other 30 calibres.

 

[Danny Fireblade]

I am using the following and getting 3/4" groups with not much effort.

New Nosler brass
Federal 215M primers
74gr RS70
Barnes 165gr TTSX
COAL 3.340"

Getting a smidge under 3100fps. Obviously if trying to replicate I can only vouch for this load in my rifle, start low and work up.

If you are after 180gr bullets I have a few hundred Nosler Accubond 180gr for sale if anyone is interested.

 

[Griffo13]

My current home load is:
168 Tmk
Ppu brass
72.5 N160
Federal Lmag primer
Coal 3.505
Remington r700 with r5 rifling 24inch barrel
3025fps

Super accurate in my current set up well sub MOA at 100m. If I remember correctly they have a 0.080 jump to the lands.