Thread: Seating depth dilemma

First photo (left to right): Fusion, Precision Hunter and LRAB at mag length.



Second photo: seating depth to achieve SAAMI spec.



I think my magazine must be around 0.025” shorter again than SAAMI; the factory PHs don’t fit.

Greetings mopheadrob,
From the photo's it looks as though the full dia section of the projectile is inside the case neck so if you are comfortable seating them longer and single loading that sounds like a good idea. You could use a load with a slightly blunter projectile as a back up in the mag. This was my intention with the SAUM which I must get back to. The 7mm WSM has a very short neck so seating the start of the boat tail just below the neck is likely a good place to start. The LRAB does hot allow much wiggle room due to the short full dia shape.
Regards Grandpamac.

Originally Posted by grandpamac

Greetings mopheadrob,
From the photo's it looks as though the full dia section of the projectile is inside the case neck so if you are comfortable seating them longer and single loading that sounds like a good idea. You could use a load with a slightly blunter projectile as a back up in the mag. This was my intention with the SAUM which I must get back to. The 7mm WSM has a very short neck so seating the start of the boat tail just below the neck is likely a good place to start. The LRAB does hot allow much wiggle room due to the short full dia shape.
Regards Grandpamac.

Thanks @grandpamac, this confirms my thinking. Especially as my once-fired brass is a bit shorter than the SAAMI spec trim length for some reason. I'm still shooting the PowerShoks to build up a supply of brass, so these can be my backups in the mag.

Many of the Yanks are moving away from loading close to lands anyway. Should be able to tune mag length with powder charge to get node. There is a really good YouTube video around this but I've forgotten the guys name?

https://www.youtube.com/watch?v=oRXlCG9YZbQ Erik Cortina Good Watch

Originally Posted by flock

https://www.youtube.com/watch?v=oRXlCG9YZbQ Erik Cortina Good Watch

Yes, that's the one. He's really interesting to watch and breaks quite a few long held myths!

Originally Posted by flock

https://www.youtube.com/watch?v=oRXlCG9YZbQ Erik Cortina Good Watch

Yeah, had watched that a while ago, hence the plan to start with around 20 - 40 thou jump to find the best charge and then worry about seating depth after that.