416 WSM first range trip

[Don416]

Without seeing it i could be completely wrong, but.
It sound more like the second round is not sliding up the magazine ramp at the front of the magazine. The blunter round nose projectiles might just be fowling on a lip where the pointed projectiles ramp past the lip/edge.

The 1st round when mag is full with 3 rounds feeds from the right side and second jamming cartridge from the left side.
So what can I do to correct this?

 

[hoytcanon]

The 1st round when mag is full with 3 rounds feeds from the right side and second jamming cartridge from the left side.
So what can I do to correct this?

If the rounds are not feeding from the left side, there is a pretty good chance that the rear of your mag box is not fully seated. Check to make sure that the box is fully flush along it's entire length.

 

[BlueFlyer]

The 1st round when mag is full with 3 rounds feeds from the right side and second jamming cartridge from the left side.

First confirm per hoytcanon.
Does the 3rd round feed? Also on the right side.
As it feeds pointed projectiles OK, have a look at the left side of th feed ramp, to see where the point of the round nose projectile is relative to the ramp. Also repeat the process with a pointed projectile.
Then you should be able to work out where you need to modify the feed ramp.
We are talking about the feed ramp at the front of the magazine - not the action rails

 

[Don416]

Once I dig out the 2nd round the 3rd round feeds from the right ok. It’s a staggered box mag, R, L, R, 3 rounds full.
Will check other stuff as you guys suggested.
Thanks.

 

[BlueFlyer]

Once I dig out the 2nd round the 3rd round feeds from the right ok. It’s a staggered box mag, R, L, R, 3 rounds full.

Great - sounds like with a little tweak you should be able to get the LH side working.