A friend of mine broke, split them half way up the threads, two full length resizing dies when he attempted to use 300 rem ultra mag brass in place of 404 jeffery brass. He was loading for his 338 Hart at the time and the dies were cut for the jeffrey demensions.

He there Dan;

Ya you know like it is, the more gun's the less choice.
I think it would be a nice project.
The 500 ,well it's rocking , the dentist like's it.
Bill managed to finish it before he left,it won't feed right from the left rail and I may have to send it to Mr Leeper for that.
It's a 602 in it's original ( heavy re enforced) stock it has been holding up OK so far +/- 300 full power rounds.
The Pac Nor barrel (parallel lead) has a brake on it the gun weighs 10 lbs and kicks like a mule.
10 rnd's max off the bench.
Since it will never see Africa it is now just the biggest gun in town gun.
It's a great gravel and cutline maker,I shot in to the bush with full metal jacked it went through 4 20" pine's and if the rocky's did't stop it it's now in BC.
I shoot it mostly with 550 gr cast because i can't afford the bullets it's fun.
I am sending a FN action to Mr. Leeper this week to have it barreled to 350 Rem Mag so that's first,then later it is on to the 360.
Hope you are doing well
Regards Martin

Santala:
I am glad to see your responce because I was wondering if I would need to put a brake on the gun.
I would like to have the gun build with a octagon barrel and a brake would not look cool on that.
So you say if I keep the weight around 10 lbs it would not be to bad?
Where would you put the recoil ?:say a 375 H&H a in a 10 1/4 lbs Ruger or 416 Rigby in 10lbs, if you figure no more than these I will go without the brake.
On the resizing of the RUM brass why did you go with the 300 brass?
I used the 375 because I found that if I size it down I am still .002" less in wall thickness compared to the Imp brass,mind you I only have one case to compare with.
How does the 300 in that department?
Regards Martin

Archer:
I will keep a eye on that for sure so far using the 360 dies all seems well I can's say I can feel unusual pressure when I work them in the press maybe the imps are a little looser we will see
Regards martin

I would say a brake on an octagon would be quite original, if you could find someone to mschine it to the barrel. And I'm not all that fond of brakes.
Give it a thought.
As for recoil, my gun will be about 10# loaded up, and full-house loads will hit around 50 ft lb.
The H&H would be right around 35-40 or so. Much depends on your stock design and recoil pad, as you probably know.

Good to hear from you Martin. Incidentally, isn't the Tomahawk based on Lazzeroni's own brass design (which is damn close to 416 rigby cases), not the ultra? - dan

Dan,

You're also correct. Lazz has a Tomahawk as well, and it is larger diameter than the Ultra, the shorty version though, like the WSM's. Their long version is the 338 Titan. I'm not sure of the base diameter, close to the Rigby tho. The Tomahawk I refered to is just one that's based on the 7mm, 300 or 375 length Ultra case.

Ok, thanks for the info. - Dan