300 win mag with 210 gn bergers

[apples]

Is anyone running 210gn bergers through their 300 win mag barrel? I plan on using it for long range sambar hunting, out to around 7 or 800 meters. Any pet loads would be appreciated. Cheers apples

[Dom]

The heaviest I've run out of my 300 is 200gr A Frames using H4831SC. 800 meters is a helluva poke, I can't help you out any there. You may want to peruse the long range hunting forum, there are some guys that live long range shooting on there.

[apples]

Thanks dom. Mine shoots .5 moa with Barnes so if i can replicate that with the bergers then it will make a great long range gun with a nightforce scope

[Grumulkin]

The 210 gr. bullet would be fine for long range as long as the barrel twist is fast enough. Berger bullets tend to be quite long compared to other bullets. My 300 Win. Mag. likes 200 gr. Accubonds out of a 1:10 twist barrel very well.

[apples]

Thanks grumulkin, great group. The berger site says that the 210s require a 1:11 twist which is what the r93 barrel is so I'm going to get some and give them a burl. I saw a sambar spiker shot with one yesterday at 624 meters ranged and it didn't like it one bit!

[Gun Barrel Ecologist]

Grumulkin, any idea what speed those loads are doing to get that great group?

H4831SC is supposedly rebadged ADI AR2213SC, I'm running 72g of it under the RWS 201g KS and only getting 2790fps according to my mates chrony but I seem to recall Dom's A frames are going faster for slightly less H4831SC from memory (plenty of variables that can influence velocity I know...)

apples, at 800m does the increased BC of the 210s make up for the reduced muzzle velocity?

[apples]

I haven't run the numbers mate, but I would expect so. I run heavy for caliper bullets as a rule.

[Gun Barrel Ecologist]

I tend to do similar where possible.
In the win mag though I tend to regard the 200g as heavy (enough) for caliber and think the 208g and bigger are best saved for the .30/338Ls and alike.
Actually pondering if I shouldn't work up a load for the boxes of 180g Accubonds I have sitting in the cupboard, been meaning to buy some 200g NABs but in all seriousness I'm not sure I need such a well constructed heavy bullet for the game I point it at

[Grumulkin]

Grumulkin, any idea what speed those loads are doing to get that great group?

Muzzle velocity is about 2,850 fps.

[Spartan]

Still working on the following loads (OCW technique used to check pressures and identify optimum node) but here is the data so far for R8 300WinMag Std. shooting 185 Berger VLD-H with once-fired Norma brass & Fed215M primers (neither load is compressed or showing excessive signs of pressures - I have checked for flat primers and there is no bulge above the belt);

AR2213sc - 75.6 gr. (>2.0gr over book) = 2860fps and accuracy shoots <0 .5MOA. Jump .0295" with COAL to ogive 2.882".

RL17 - 72.0 gr. (>1.5 gr. over book) = 3096fps and accuracy shoots <0.4MOA. Jump .0345" with COAL to ogive 2.877".

AR2213 is accurate to .25MOA with 76.0 gr.. Both powders can improve accuracy with seating tinkering, etc.

Need advice: not sure which powder to develop further for this bullet. I feel 2213sc has the most potential for accuracy but it is significanly over book figures and slower. Whereas RL 17 has the legs and is also very accurate. Any advice would be appreciated.

Thanks in advance,
Spartan.

[boyscout]

Personally i like the slower powders for the 300 win mag, but your getting great velocity out of the rl17. I shoot Retumbo using the 185 Bergers and my velocity is 3030, Lapua brass Fed primer. I would like to try N560, or you could do it for both of us, its the same burn rate as the H4831sc/ Ar2213sc but should give some extra velocity. Its a double based powder like RL17 but with a slower burn rate, also designed for the short mag cartridges. You can email Berger and they will give you some recommendations.

All that said i would shoot the Rl17 load out to 500 yards and if your groups stay together, if so run with it.

[deerhunter338mag]

Been playing with 210gr Bergers 77gr of AR2217 jammed in the lands seems to work alright. 3 in the same hole at 100 meters but I found the barrel doesn't like to get hot the 4th shot moved about 2'' to the right

[Spartan]

DH,
That is a good load. Would be better with the 4th shot grouping like the rest.

Have you checked whether the barrel is touching the stock after the third shot?

[deerhunter338mag]

That's a very good point and I will check that just to be sure but my stock has been modified and the tinker set the rest up for me.

[deerhunter338mag]

Well I had a crack with a mate today that's a very impressive long range shooter. He set a target for me out to 460 meters with a clean barrel running prolix on a patch about 30 times up and down to make the barrel like silk. very happy with my 1st shot If it was a deer it was dead. For now I will stick to 77gr of AR2217 on the lands. I just need to do a few setting's with the program and a few cold shot's with a clean barrel out to 500 and 600 and 700 meters which is about max for the 300 win mag and I'm good to go.