Need Help - .338 Lapua Load Data

[TaergEno]

Hello,

I have been scouring the interwebs for quite some time now, attempting to find reloading data for a specific bullet for my rifle.

The Rifle: Weatherby Mark V Accumark .338 Lapua Magnum

The Bullet: Swift Scirocco II 210gr
Current Powder I have: Vihtavuori N160

I cannot find any data at all for this bullet. I have contacted Swift (about a month ago) and have yet to receive a reply from them. I have also contacted Lapua/Vihtavuori regarding load data and they did not have a specific answer, and said it would be best to contact Swift or find others that have worked up a load for this bullet.

So here I am, asking if anyone has any idea or data for this specific load.

Any help would be greatly appreciated.

 

[I Am Hero]

*THIS IS MY OWN OPINION, TAKE WITH A GRAIN OF SALT....or powder

I would start between 84-87 gr of powder. I know if you look at Lapua's website they do not have a specific load for the 210 Swift that you want to load but they do have a 200 and 225 gr Hornady load.

200 gr SP Hornady
OAL 3.583
Powder: N160
Min 89.6 gr -- Velocity 3038
Max 96.0 gr -- Velocity 3259

225 gr SP Hornady
OAL 3.583
Powder: N160
Min 78.3 -- Velocity 2723
Max 87.0 -- Velocity 2953

I feel like if you started near the max load of the 225 Hornady you would be alright to start a load since that isn't even the min amount for the 200.

Hope that helps some.

 

[TaergEno]

That does help.

I should also say that I am new to reloading, so I want to be as cautious as possible so I don't blow myself up lol.

As far as I have read, once your bolt starts to stick, that is when you are getting to a point where there is too much pressure correct? And at this point, you would want to back off a bit on the load?

 

[I Am Hero]

There are actually several pressure signs. Please read the article in the link below to familiarize yourself:

Reading Pressure Signs - MassReloading

 

[TaergEno]

There are actually several pressure signs. Please read the article in the link below to familiarize yourself:

Reading Pressure Signs - MassReloading

Thank you very much Hero!

Oh, and I finally found some actual load data.

I found a Lyman book that was opened at Sportsmans Warehouse where I live and I browsed through it.

I found the following:
210 gr. Jacketed Scirocco B.C. .507 S.D. .263
Powder | Min Load | Velocity (FPS) | Pressure (PSI) | Max Load | Velocity (FPS) | Pressure (PSI)
RX19 | 83.0 | 2995 | 55,200 | 90.0 | 3167 | 62,000
N560 | 88.0 | 3070 | 57,200 | 95.0 | 3217 | 62,500
H-4831SC | 83.0 | 2921 | 55,500 | 88.0 | 3072 | 62,100
AA-3100 | 83.0 | 2956 | 55,200 | 91.0 | 3108 | 61,500
IMR-7828 | 86.0 | 2956 | 54,200 | 93.0 | 3106 | 59,500
Magnum | 95.0 | 2981 | 57,900 | 100.0 | 3095 | 61,900

Correct me if I am wrong, but does slower burning powder increase the pressure that is created?

Also, do you think that the above load data would work if using N160 instead of N560? According to the Vihtavuori Burn Rate Chart, N160 and N560 are close to the same burn rate? It appears that N560 is slightly slower burning than N160. Here is the chart I am referring to: Lapua/Vihtavuori Burn Rate Chart