7mm wsm

[Lou Murdica]

I have a question about speed using a 7mm wsm. Berger 175 vld
At 100 yards I can shoot a 5 shoot group that is a dot at 2875fps. But get vertical after 2925
Using mag pro I can go to 3200 fps with no pressure problems . But can't find that next node.
I have tried all the powders none will go we're mag pro will get to.
But 3 powders shoot good at 2800-2900.
Does anyone shoot .200 groups at 100 over 2950.
It shoots. .500 to .750 after 3000 fps.

 

[TonyR]

What barrel and action are you using? I had this same problem when I built a 7WSM on a Remington 700 action. The problem went away when I switched to a BAT M. I think that big case head causes a slight movement in the barrel tenon as the pressure climbs. I shot a 284 Shehane on the same action with a heavy barrel and it hammered at 2900 fps. Just an opinion, but I think the size of the case and pressure have to be part of the problem with the WSM with the smaller receivers like the 700.

 

[TonyR]

Kelblys f class.
Bartlein barrel

Something else then. The F-Class Panda is plenty strong for a 7WSM. I was never able to get the same ES from a 7WSM that I was able to get with a RSAUM. You might give N165 at try with BR-2 primers or Fed 215Ms if the BR-2s don't work. I got my best results with the 7/300WSM using N165. Very tight vertical to 1000 yards with the 180 Hybrids at about 2950 with a 32 inch Bartlein.. It would be interesting to see what your vertical dispersion would be at 300 yards.

 

[lerude]

Hello TonyR

What weight of powder use you in N 165 ?

thank you very much

 

[dragman]

Seems to me that some of the 7wsm's I played with didn't like to be pushed as long as I stayed 2850-2950 they really wanted to shoot, but when pushed problems came up. Mine ended up performing the best with a 162Amax. I ended up ditching the WSM in the 7mm as it was too touchy and stuck too .284's and 7SAUM.

 

[JLDavid]

lou,
What powder are you using at 2875fps with the 175's? I am just curious as I am getting ready to start a hunting rifle project with the WSM. I plan to start shooting 168's but will try the 175's if I can't find one that shoots. Are you shooting magazine length rounds or is you reamer throated long for single shot? Thanks.

David