Posing a Gold Cup NM ammo question

[rl45acp]

I wasn’t sure whether to post here or in the ammo/reloading forum, but this one is general, so what the heck.

As I am quite new here, a tiny bit of back ground info per my 1911 past. I fired my first one at around age 8 or 9. It was my pops boony gun, he carried it every time we went afield. It was an original Colt made for the civilian market in the 40’s. Of course before he let me fire it, he made sure I could completely tear it down and reassemble it,….blind folded,….up hill…..both ways……in 26” of snow…..

But I digress. That started my love affair with the 1911. I have three 1911 style pistols now. I know I should have more, but there are too many other guns out there that need a good home (I know blasphemy!).

I just recently received my, new to me, Colt Series 70 Goldcup National Match. I’m not sure that the guide rod and recoil spring are stock. It has an integral recoil buffer on the rod, and what might be an unoriginal plunger tube. I have also heard that the barrel bushing in Gold Cups have the serial number stamped onto them, mine does not.

I have read that the Gold Cup were tuned/fitted to fire 200 gr SWC’s. So, should I only fire 200gr SWC’s through it, or am I okay feeding it 230gr RN? Is there a way for me to check the recoil spring rate at home (home built apparatus not out of the question, suggestions welcome)?

TIA,
Rob

[Graves]

The NM guns were designed with shooting the lighter target loads in mind. The problem (if you want full power hardball) as I understand is that they were sold with a 10# or 12# spring (can't remember) and had some meat removed from the rear of the slide. I wouldn't worry about trying to figure out what the spring you have in there right now as it more than likely needs to be replaced anyways. If you wanna shoot the heavier stuff exclusively, go with a 16# or 18# spring - they're cheap and easy to come by. Give Wolff Springs a gander.

[Bailey Guns]

I think the Gold Cup pistols all come stock (especially for a 70 series) with a standard GI guide rod setup.

Go to Brownell's and get a standard guide rod, a standard spring plug and a 16 - 18 lb spring (like Graves said). It'll just cost a few bucks and it'll make maintaining your gun much easier. And you can probably shoot anything you like through it.

I just talked to an elderly retired Navy man yesterday who lives in FL. He bought an old 1911 from me...a Colt made in 1915. He said he's had pretty much one of every type of 1911 ever made and his current collection is over 100 1911 pistols, almost all Colt military guns dating back to...1911. He was a fascinating man to talk to. He said in the 60s he had owned a Singer and a North American Arms...said he sold them both sometime in the mid 60s for a $1,000 to buy furnishings for his house and new bride after he got married. I can't even imagine what those two would be worth today.

Then he started talking about the old Harley's he's had...

Sorry for going off topic...he was just a neat old guy to talk to.

[10x]

A Series 70 GCNM has a standard recoil spring guide and a standard weight 16 lb recoil spring. You can fire normal 230 grain ball all you want using the 16 lb spring. I cannot tell you how many I have shot in my Gold Cups.

Some came with two springs, a 12 lb for extremely light loads as well as the 16 lb spring. The 12 lb spring is for powder puff hand loads.
Even a factory WW or Rem, etc, 185 SWC targert round will cycle the Golc Cup with 18 1/2 lb springs.

Get rid of the recoil buffer arrangement, you don't need it and those things can cause reliability problems.

I would suggest that you get a new 16 lb spring from Wolff, Brownells or a gun shop. Besides normal lubrication that is the best thing you can do for your Gold Cup.

The discussion about the slide being lightened applies to pre Series 70 Gold Cup National Match guns. Note that the box says Gold Cup National Match, but the slides on these guns say only National Match. The serial numbers on the frames have five digits followed by the NM letters, 12345NM.

Even with these guns using a 16 lb spring you can shoot 230 grain ball all you want. The rumor about cracked slides was just that. The lightened area is in the rear of the slide under the extractor, no where near the weakest area of the slide, the ejection port. I have never seen or even seen credible evidence of slides cracking on these guns. The only credible report that I have seen was of the slides being battered, not cracked, from shooting a lot of 230 grain ball with a 12 lb spring.

The Series 70 GCNM has a collet (or fingered) bushing. Colt did not stamp the bushings. Who ever told you that was thinking about US military built National Match 1911A1 USGI guns.

[SA Friday]

I guess I have a different opinion on the issue. If what you have in the gun runs reliably, shoot the gun. No need to change out the guide rod for stock parts unless your desire is to have the gun as stock as possible. I would take the buffer off though and see how it shoots without it. I'm not a buffer fan, but if they work in the gun and make is softer shooting, they're not necessarily a bad thing. You just have to change them out regularly.

As for ammo and recoil springs, I have a Colt Govt 5" Series 80 that I had a lot of work done to it and converted to a Series 70. I shoot it competitively on occasion in Single Stack Division USPSA. 230gr reloads are so fricken soft to shoot it feels like cheating. They are much softer than my 200gr reloads. I load for USPSA's major power factor requirements; (vel)bullet weight/1000=power factor. I shoot for around 170 pf, and the heavier bullet equates to less velocity needed. So, I find heavier bullets pushed with fast burning powders equate to much less recoil.

I run a 12.5lb recoil spring with both the 230 and 200 gr rounds. With basic target loads, a 12.5 or 14lb recoil spring will work just fine. The only reason to go heavier IMO is if you are shooting very hot loads with a difficult bullet profile to chamber. Hell, in my STI Edge I run a 10lb spring.

I've done my share of testing with Glocks, 1911's and 2011's in this area. Recoil springs come down to reliable ejection and feeding, and then tuning the gun with the load and the shooter. Everyone thinks about the slide moving back and the effects of the recoil spring, but the more important aspect of the equasion is the slide going forward at the strength of the recoil spring. You have to deal with the reciprocating mass of the slide at this point. Too much spring causes the gun to nose dive (takes longer to get back on target) as it chambers the next round and locks up if you are over sprung. Conversely, too little spring and your round won't chamber and lock.

Springs are cheap. Buy some springs of various weight and test it out. See what works and feels best for your shooting.

[SNAFU]

I'm probably wrong,but,never heard that the Gold Cup could only fire 200grn swc.
Have heard that firing full strength fmj constantly could damage the frame.
I believe that's due to the lighter recoil spring.

Just thinking the swc issue is a carry over of the old S&W 52?