I got a old rebuild swedish mauser in 9.3*62 and i got a load of 9.3*57 ammo after a friend.
Can i use these in my rifle for target practice or just for the fun of making a lot of noice:D

NO.Those are both Mauser cartridges. They are rimless. Because they are rimless, the cases headspace on the shoulder of the case. Using the shorter cartridge in the longer chamber will result in a lot of extra headspace, close to 0.30". I believe that the 9.3X57 is a tad smaller at the head also. All in all, not good.
It might be possible to blow out the smaller case but that would leave you with a shorter neck.
Pete

I dident think it would work but better ask then try:)

JB, there are examples, the 308 Winchester has been fired in the 30/06 chamber, the 308 Winchester is .011 larger in diameter at the shoulder than the 30/06 chamber at the tapper, this causes the case to' 'jam' or as the loader said, 'it chambered with resistance. The 308 Winchester case, after firing, forms to the 30/06 chamber and comes out looking like a short neck 30/06 case, the pressure created is reduced because the case must conform to the chamber before pressure can rise.

Many 8MMX57s have been fired in 8MM/06s with the same results except the case body at the shoulder is floating and can be pushed forward when the firing pin strikes the primer, the distance the case is driven in to the chamber depends on the condition of the chamber, an 8MMX57 fired in an 8/06 chamber comes out of the chamber, after firing, looks like an 8MM//06 with a short neck like the 308 Winchester after it is fired in the 30/06 chamber.

Some say Hatcher, in an effort to determine problems with the 1903 Springfield chambered the 30/06 chamber with with as much as .200 head space??, absolutely no conclusions could be determined by this set of controls, the amount of pressure required to separate the case for a disaster could not be reached until the pressure reached its peak, and that was not until the case expanded in diameter to conform to the dimensions of the chamber, to separate, the case must lock onto the chamber.

There is a difference when an 8MMX57 is chambered in a 30/06, the difference in the bullets (.308, .323) diameters will cause pressure to climb because of the obstruction. Some claim they have shot 8MMX57 in 30/06 chambers, closing the 30/06 bolt on an 87MM57 takes effort, a lot of effort.

Some very talented shooters have had too many different cartridges on the shooting bench when shooting and have mistaken one cartridge for another, the diameter of the bullet in short cases that will chamber in long chambers with smaller bores have been the most devastating.

I can not encourage you in your effort, I hope there is something that was said, above, that would cause you to think it is not a good ideal.

F. Guffey

Mr. Guffey: Hi. Haven't seen your posts much since I rarely go to the CSP forum at Jouster any more.
Spend my time here and at the Firing Line. Much friendlier.
Pete (darkgael)

Pete, good to hear from you, I have visited some, made arrangements to meet others and had some to make the effort to visit with specific questions, three compliments, that was three more than I was trying for.

Trying to put some (DP) P14s together without creating a lot of work, I have been looking at the 300 H&H case you gave me and 4 M1917 barrels, one is now a P14 30/06, another is a 308 Norma Mag another is going to be a (Modified) 30 Remington Mag and the last one is going to be an Ackley Improved 30/06, the length of the 300 H&H and the 8"30' shoulder give me two reasons to decided against a rifle in that chamber.

F. Guffey

Yes, it has happend to me. We were making ballistic tables when with all the rilfes around I took a 30-06 rifle and a box of 270 catridges.
All the guys helping me were experienced and noticed what I was doing. When I missed the pickup sensor at 500m by a couple of meters first left, then right then below, I started cursing. The bastards behind me eventually could not contain themselvs any longer. I felt a real fool on that day. Of course nothing can happen, but there are worse combinations. I am aware of quite a few cases where a .308 Win was fired from a .270. In none of the cases was serious damage other than shock.

Regards

WAH

yep. Like one guy told me after I did something similar and was feeling foolish. He said, "There are those who have. And there are those who will". It was plain each guy there had done it at least once before.

Pete D. I received the cases from 'DINEK' in Michigan, I dug the cases out to check head stamps, 5 are R-P 300 Magnum the rest are 300H&H Magnum, I confused 'DINEK' with 'DARKAGEL'.

F. Guffey