Would anyone care to proof this for me?
http://www.accuratereloading.com/ubbthreads/showflat.php?Cat=&Number=513200&page=0&view=collapsed&sb=5&o=21&fpart=1

Thanks in advance!

I ran your dimensions, and got a case that held about 125 gr H2O given a brass case weight of 250 grains (my best guess). The best velocity at a max pressure of 50KPSI was 2198 FPS (5737lb-ft) with 90.4 gr IMR3031 for the 18" barrel and the 535 gr Woodleigh. The velocity went to 2289 (6223lb-ft) with a 22" barrel. With a 440 grain Woodleigh (I don't have North Fork in the QL database) and the 18" barrel, QL gave 2439 FPS (5812lb-ft) with 106.8 gr of WIN748 @50KPSI, and 2553FPS (6368lb-ft) with the 22" barrel.

Hope that this helps. Sounds like a real fun rifle. The muzzle energys are impressive. The barrel ought to last forever.

Thank you, thank you.

Very helpful.

But I'm looking for more 60-62k psi.

50k CUP. If my math is right, your data is right around 40-40.5k CUP, and it matches perfectly my figures for that pressure range.

Somewhat validating.

OK - I did it in PSI as QL does not have CUP to my knowledge.

Here is the data for the 535 Woodleigh, 62KPSI:
WIN748, 102.3 gr, 2335 FPS, 6477 lb-ft, 18" barrel
WIN748, 102.3 gr, 2428 FPS, 7004 lb-ft, 22" barrel

Here is the data for the 440 Woodleigh, 62KPSI:
BL-C2, 115.7 gr, 2582 FPS, 6516 lb-ft, 18" barrel
BL-C2, 115.7 gr, 2696 FPS, 7102 lb-ft, 22" barrel

Funny how it likes the faster powders. Intriguing rifle. The muzzle pressures are all at about 10KPSI, so the report and recoil will be, um, interesting. Perhaps a brake?

Thanks again! Really big help!

As for the brake, maybe, but I'd prefer just a thick barrel.

Maybe 12# fully loaded I could manage.

I was figuring 103g of IMR 4895, AA2230 or H 335 thereabouts, for my 2400 fps load.

In a 12# rifle, that would be about 80 ft lb - yikes! 14# is about 70 ft lb.

12# with your 2200 fps load would be about 70 ft lb.

Er, ah, maybe a brake....

How loud do you think the report would be out of an 18" bbl?

Exciting! (Gunsmith says, "Show me the money!")

So, CRF or CRPF?

I am guessing that it would like shooting one of the overbore magnums, like the 7mm RUM, or a 338 Lapua Mag, in terms of report. The 22" barrel gets the pressure down below 10KPSI at the muzzle, but it will still be loud simply because of the volume of gas. The bore volume is about 3.5 times more than a 7mm! That, and the recoil would make me flinch big time. My buddy has a 7mm RUM, and I am done in after three shots. Still and all, it is a very interesting idea. I wonder if you could reduce the neck down to 338, and shorten the case more, and get a super short magnum with 338 Lapua Mag or better ballistics? The BCs on some of those 338 bullets are great, making for a fun long range rifle.

Basically, you have a case with almost 10% more capacity under a bullet than it's full-length 8mm Rem-based counterpart. Hard to believe.
So, same velocities at slightly lower pressures, more or less. With the 470 Capstick giving 2400 fps with a 500g, it's easy to see this little monster doing 2400 with 535g. And there's no real good reason to try to do this in an 18" bbl, except to prove a point. A 22" bbl would still be right handy, and make that velocity that much easier to acheive.

I have run these same tests on a 350 and 370g .416" version, and it gives similar results. With a 22" or 24" bbl it should act like a 416 Remington.
And be a lot more fun to shoot than the 18" 50 Fireplug!
I really doubt there's a way you could cut the Lapua down significantly and get similar performance.

Now, how much $ is it worth to get a short action 416 Rem, when Winchester already chambers it in the long action?

BB,
I replied to your orginal thread
jeffe