Based on a couple posts I made in other threads several members have PM'd me for more info on the two cartridges I mentioned for cast bullets in Mauser rifles. These are the 30x57 and the 35x57. Both are made from 8x57 cases by simply FL sizing them in the shortened '06 or 35 Whelen die. They can also be formed from '06 or similar cases which allows customizing the case to fit the chamber.
These two cartridges have 5 major attributes;
First is the case is perfect for Mauser actions. The length is correct allowing for heavier bullets to be used without seating them below the case necks. The case taper is the Mauser taper that the magazine and feed rails are made for, hence they feed slicker than the scum off a Lousianna swamp.
Second is case capacity; It is just slightly more than a .308/.358 Winchester so with correct medium or slower burning powders loading density is close to 100% when using medium and heavier cast bullets in the 2200+ velocity range.
Third is; The long '06 length neck. This allows most bullets to be seated to the base of the neck and the lube grooves are covered. Also the longer neck gives additional support to the bullet during initial accelleration.
Fourth is; the ease of which cases are made and the fact that regular dies are used. No special custom dies are required. I shorten the dies .288" for both cartridges. With both the FL and seater shortened you are set to go. Though I'd also use a shortened NS die.
The fifth attribute is in chambering; I shorten the dies and form 3 cases. These are used as headspace guages. The barrel is then chambered using standard '06 or 35 Whelen reamers. A tight neck match reamer for the '06 might be better though for the 30x57. Both reamers are readily availabel to rent or buy so no custom reamer is involved.
I'm looking at ordering a pre-threaded Shilen 26" match stainless barrel with a 14" twist (for either caliber) for a Sporter M98 of mine. I've already got the '06 reamer so I might go that route. Below is the shortened 30x57 FL die, a 30x57, a 8x57 and an '06. Note that the neck on the 30x57 is longer than the 8x57. The 30x57 case is formed from an '06 case and is trimmed to the max AOL the chamber of my reamer allows. This is another attribute for both cartridges is that cases can be formed for and exact fit to the chamber. This is especially benificial in the neck area when using cast bullets at higher pressure/velocities. Sorry I don't have any 35x57 as the dies went with a guy who already has one and loves it. The 35x57 is the same as the 30x57 so you should get the picture (is that a pun?).
Anyways I've pondered a long time as to the best cast bullet cartridge for a practical hunting rifle built on a Mauser action and these two cartridges are what I believe to be the best answer. Hard choice to make between them.
Larry Gibson
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Originally Posted by johnch
