300 Win Mag H2O capacity

mick_762 · Post by **mick_762** » Fri Apr 03, 2015 1:30 pm

Chasing a bit of info on the H20 capacity of the 300 Win Mag.

My 308 Norma Mag has a capacity of 91.4gn of water in a once fired Norma case, and I am trying to work out if this is correct - it seems very different to "published data".

The Norma is supposed to be a tad smaller in capacity to the .300 Win Mag I was lead to believe.
Yes I know all chambers are "different" etc - but if my Norma has more case capacity AND the longer neck - well it just gets betterer and betterer

Mick

Camel · Post by **Camel** » Fri Apr 03, 2015 1:34 pm

Troll

I don't put water in mine, I put gun powder, they work better that way.

kickinback · Post by **kickinback** » Fri Apr 03, 2015 2:58 pm

Mick, the good news is you will be ahead of the 30/06, unlike most 300WM.

mick_762 · Post by **mick_762** » Fri Apr 03, 2015 3:12 pm

kickinback wrote:Mick, the good news is you will be ahead of the 30/06, unlike most 300WM.

And once I finish my load development, will be loaded like a Magnum should be - maximum powder at best accuracy potential.

a.JR · Post by **a.JR** » Fri Apr 03, 2015 6:10 pm

Depending on brass manufacturer it will go 92 to 94.5gns on the quality brands ..JR..Jeff Rogers

mick_762 · Post by **mick_762** » Fri Apr 03, 2015 7:03 pm

a.JR wrote:Depending on brass manufacturer it will go 92 to 94.5gns on the quality brands ..JR..Jeff Rogers

Cheers Jeff, I have read quite a bit of data with the Win Mag going anywhere from 84gns.

Mick

Rinso · Post by **Rinso** » Fri Apr 03, 2015 10:04 pm

kickinback wrote:Mick, the good news is you will be ahead of the 30/06, unlike most 300WM.

30:06

you crack me up

I recall Lapua being around 93-94grns.

308 Norma is a good case what brand of brass you using?

mick_762 · Post by **mick_762** » Sat Apr 04, 2015 6:27 am

Norma cases, less velocity than fire forming 300 WinMag PMC cases, but hey its a Norma so may as well feed it on a Swedish diet.

The Raven · Post by **The Raven** » Sat Apr 04, 2015 7:56 am

Camel wrote:Troll

I don't put water in mine, I put gun powder, they work better that way.

Hmm, be interesting to see that fired.

Rinso · Post by **Rinso** » Sat Apr 04, 2015 11:13 am

mick_762 wrote:Norma cases, less velocity than fire forming 300 WinMag PMC cases, but hey its a Norma so may as well feed it on a Swedish diet.

Norma brass is not bad but can be soft. I used some Norma 243 brass in a 260AI and lost the primer pockets after a about 4 shots, that said the rifle shot very well. Can become costly if you are burning brass quickly then again my loads were pretty warm.
I would expect you to get solid velocities from the 308NM and be very close to 300WM speeds there is not much between them. Interested to see your results.
I would look at the 30 Boo Boo as an alternative down the track. Excellent brass (RWS) costly but lasts forever matching 300WM/308NM velocity and no belted cases.

a.JR · Post by **a.JR** » Sat Apr 04, 2015 12:18 pm

Hi , A friend of mine from Hawks Ridge (USA) ran for many years a modified 308nm(RWS brass) he called a 30 SOB or Son Of Boo.. It had 88gns of H20 capacity and ran nearly identical speeds as my 300 Redneck at compared with my 92 gns with Lapua brass .. I think i remember at least one 6match agg(1K) in the high 5inch zone in about 2008 from him and he was over 70 years of age then .. I'm sure PTG would be able to recreate that reamer still today if you asked ..JR..Jeff Rogers

Post by **MISSED** » Sat Apr 04, 2015 3:25 pm

I have not got any with spent primers I could measure so I weighed them instead these are an average over 10 cases

Norma 215

Remember 239

PMC 249

It would be fair to say Norma would have the most capacity followed by Rem and PMC

AusVarmint