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Hello. The Hi Powers I bought until about '75 or '76 did have the lighter mainspring. I'm not sure if it was 26 or 28 lbs, but yes, use it. If you plan to use primarily standard pressure ammo, I'd think the standard 17-lb recoil spring coupled with the 26-lb mainspring should be fine. I don't know how much this pistol's been shot, but it might be that as it smooths up, it would work fine with the 18.5 pound recoil spring. All of mine do, but I do hear from others on occassion of the problem you speak. I think the first thing I'd do would be to just try the standard recoil spring with the 32-lb mainspring. If that wasn't satisfactory, drop the latter down to 26 or 28 pounds. The reason is that 17-lb recoil spring/32-lb mainspring was the way FN shipped them for years and still do. If in your particular pistol, this is not the case, drop back to the previous standard configuration.

The Winchester Value Pack ammunition varies quite a lot in my experience, but the Federal 115-gr. JHP is usually pretty consistent.

Current Hi Powers use a 32-lb mainspring as standard, up from the 26 or 28 pounds from years ago. A couple of my older Hi Powers use 18.5-lb springs but the older, lighter mainsprings and continue to spit rounds downrange with no problem. I primarily use standard velocity ammunition in these. No problems so I would expect the same for your pistol.
 
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