Have two M70's in...

[jjroth]

7mmMag. One's a 1966 post, seconds is a 1998 "black Shadow"
Got fired cases from both, how to set-up sizer for reloading for both (the 66 is 89% and going to be safe queen, but no sense to have not sight-in)?
Get a Stony Pt., and determine the fires case shoulder and set-back during sizing to the best avearage for both or what??
Thanks.

Information

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[Sunray]

No guages are required. FL resizing will do it. You have to Full Length resize everytime if you want to use the same brass in two rifles. Been doing it for eons for my M1 and 1903A4. No fuss or bother.
"...no sense to have not sight-in?..." Agreed, but work up a load first and make a note of the most accurate load in your manual.

[jjroth]

the oldhiemers been kicking in lately. May think of what I want to say, but the fingers not cooperating.

[Vern Humphrey]

Neck size one case from each rifle and try them in the other rifle. Chances are, one case will go, the other won't. Take the case that won't go and screw your resizing die down slowly until the case will go in both rifles. That's the setting you want.

The reason for this is that beltedmagnums ofter have rather sloppy dimensions - they are designed to headspace on the belt, so manufacturers aren't so careful where they locate the shoulder of the chamber. This can result in serious case stretching, so most reloaders only neck size or set the shoulder back a smidgen to increase brass life.

An alternate approach is to segregate your brass -- use the same cases in the same rifle, and don't try to make them interchangeable.

[Sunray]

"...spelling & grammar count, but..." There, their, they're, to, too, two, then, than. No proper capitalization, punctuation or sentences. Makes me crazy. Not as crazy as the gibberish of using 'u' etc. instead of a word makes me. The nuns beat it into me in grade school. snicker.
"...the fingers not cooperating..." Stupid computers won't type what I'm thinking either. Keys on the key board are too close together too. Mind you, I was forced to do a typing test, for no apparent reason, at work(After being there for two years. Technician at an ISP. Told 'em I didn't need to type as a technician.) one time. Type the alphabet as fast as you could, twice. Did it one handed. Once right handed, once left. Under 15 seconds both times. They stopped bothering me.

[MEHavey]

Use Parashooter's technique below to get the relative headspace of the *fired* cases, and (if not different by more that a few thousandths) resize to match the smaller case.

With a good caliper and an empty 9mm pistol case, you can perform relative measurements of head-shoulder dimension to compare fired and sized cases - and at significantly less cost. This will enable you to determine how much, if any, adjustment is required for your sizer or shellholder.

(Note that a .38/.357 case does fine too.)

If *more* than a few thousandths, either resign yourself to slowly stretching cases or segregate your reloads.

[jjroth]

as I have a Sinclair Intn'l Bullet Hex, thought about using the .358 gauge, to get a quick reading. Have plenty of 9mm & .38/.357. I presume to use a "sized case"??

[Parashooter]

Depending on the neck dimensions and shoulder configuration of the cases to be measured, a 9mm or .38 pistol case may not be the best choice. They're OK for some 7mm's, but others would do better with a .32. The pistol case has to be a close-but-free slip fit over the neck and also large enough to avoid contacting any radius at the neck/shoulder junction.

It's also a good idea to make sure the pistol case mouth is undamaged (truly circular and square to the head) and to run a fine file over the headstamp to remove any burrs (or primer protrusion if not decapped).