Gentlemen
Any of you out there, having any experience with this new caliber?

How is the performance compared with the good old 9,3x62?

// M

I have not played with it. But have done some of my own testing while moving an Ackley shoulder forward. The shoulder if moved forward 4mm that is 6.45%. Without drawing it up let's just assume that increases gross capacity 6.45%. You will see about a 1 for 4 gain. So 1.6% velocity on 2500 is 40fps. If you are mag box limited the base of the bullet will still set just as deep in the case. Where you could gain a much larger increase is if your mag would allow you to set the bullet out 4mm or longer.

I spent a LOT of time in my younger days playing with a 280 case I blew out and moved the shoulder forward to look like a Gibbs with a longer neck and 40deg shoulder. After a lot of pressure testing what I found was 1%for 4% capacity incease at the same pressure. If I had a 3.4" mag I would simply stay with the 9.3X62.

I've toyed with using my reamer and building a 9.3. But for the limited gain I've decided to stay with the factory. After 40 years of hunting I no longer feel 50FPS will make a difference in how dead the animal is.

My 2cent opinion is the 9.3x66 is a solution to a problem that didn't exist.

I have one chambered in a Sako 75 and I like this rifle chambering combo a lot!!

I'm still working on my loads but right away I've been getting MOA with 250 gr Btips. I've only tried a couple of groups of of 286 gr Partitions but they were accurate too.

I will be trying to push the velocities to their upper limit in the coming weeks.

I have an on going thread on my results. I will be updating it soon as I just put a new scope on it and will now get back to developement. You can look at my recent posts to find the thread or do a search.

Ask me in a week or two .

That would be if you get your stock from McM?