Home Forums Reloading Big Game Rifles New .358 Win puzzle!

2x fired brass grows the cartridge headspace to 1.624"

This thread is getting almost nutz...WTF

The 243, 260, 7mm, 308 and 358 ALL HAVE THE EXACT SAME SHOULDER ANGLE...20�...THE EXACT SAME BASE TO SHOULDER LENGTH 1.56" AND USE THE EXACT SAME GO GAUGE. Where are all your heads???? This link is turning into some esoteric mind **** with all the un-needed math smoke-up-your-backside "stuff".

All you need to do is look in almost any reloading manual for the shoulder angle and any online reamer supplier for the headspace gauge. I mean DAMN...

And a little judicious use of a caliper measuring from the base to about the middle of the shoulder of the 358 case will give you the numbers of a fired case...then resized the same case and if it is way out of whack you will soon know it.

I thought I could get all nitpicky and make a pimple into a mountain, but this thread takes the prize...I can't compete at all.

Sakoluvr's numbers sound well within the normal parameters for his 358. I checked all muy 308 based calibers and they all ran 1.618 to 1.630 at 0.400".

Here we go...I finally dug out my Forster 243-358 headspace go gauge...it is marked 1.630". I measured 1.618" at the .400" point so the SAMMI datum point must be closer to the .420-.440 diameter. Maybe this information will settle some of the dust. Using your numbers from the first page 2.60" and change minus .977 gives 1.627"...pretty close to the go gauge, and if this is the case then there is something else going on with your rifle and sending it off was the best bet

NFG, Oh c'mon man. This is fun stuff.

I am ready to enroll in a rocket science course, or brain surgery. We all know you have to use the same headspace guage, we are just going around our ass to prove it. Like I said, fun stuff.

Yeah...right...not so much fun with all the confusion going on to any newbee trying to make heads or tails of the smoke and mirrors. Ibn dune dis stuff ny unto 50 yar and I was having trouble witda boollsheet. Next time we meet, let me make the drinks....I wonder what I can come up with that resembles what you asked for.

Hey, I resemble that remark. TFF

In all fairness, mathman has always given me and others great advice. He is always out to help, not BS.

No need to yell, when I asked about the shoulder angle I was away from my reference materials and I didn't want to assume.



I hate to tell you but a little basic trig ain't esoteric. I just needed to use it to start at one datum line and see if I could back into the other one with the information I had on hand.

had to go last night, the wife wanted to go to dinner.

Successfully fired after multiple strikes but not resized brass measured with the "custom" shoulder guage and then the exact length of the gauge subracted from the overall measurement consistently gives 1.676 inches. This again is using a fired 10mm cartridge and using a calculator to subtract its length to be sure my brain was not at fault. This messurement is consistent regardless of what the source of the brass is fired in the gun. So fired brass in the new Ruger measures 1.676 inches where the 10mm gauge hits the shoulder. Fired but not resized brass in the .308 measures 1.628 where the 10mm gauge hits the shoulder.

I hope the Ruger gunsmith that reads my two page letter has a reasonable education...

mathman, that is a stretch (1.676"). What did you come up with? That chamber sure seems to be oversize.

That's about .045" deeper than what my brass shows, sure seems like too much.

Let's see what they do or do not do.

Jimmy, I know the rifle is gone now, but did you look at the barrel stamp before you shipped it off? Are you sure it said, "358 Win." and not "358 Win. Imp" ?

Ah, but isn't a proper AI type chamber headspaced even tighter?

AI, perhaps. RI, I'm not sure follows the same rules. In theory any "improved" should fire factory ammo. Seems his does quite reliably.

Let's see what Ruger says and does! If they change the spring and send it back as "good to go" we will have a better understanding of what type of company they are or at the very least who they employ in their service dept. I will at that point send another letter but to someone higher up in their food chain like the CEO.