If I swap the barrel in my P229 from .40 to .357 Sig, do I need to change either of the sights?

It depends on the distance at which you shoot. Most today shoot at 7-10 yards. At that distance, the difference in point of impact is neglible. The difference only becomes significant at 25 yards and beyond. So my answer is probably no.

This is an EDC. If I ever need to use it for self defense, I doubt that the target would be beyond 5, maybe 10 yards.

That said, I do practice with it at the range up to 25 yards. At 25 yards I'm generally shooting Q targets. But at 10-15 yards, I use smaller targets.

I suggest you try the barrel swap without changing the sights and then make your decision.

In my experience SIG has been inconsistent in what sights it has used on 357 SIG and 40 S&W pistols. Most commonly, though, I believe #8 was at the rear of both, but on the front #6 was used for 357 and #8 for 40. I am a little vague on sight numbers myself because I’ve never bothered changing sights when switching back and forth between the two rounds in the several guns I have that I use with both.

In any event, the difference of two sight numbers at the front will (nominally) change the point of impact by 2 inches at 25 yards, or about 1.2 inches at 15. Because those differences are so small is why I have never worried about which one I was using at any particular time.

quote:

Originally posted by neex:
If I swap the barrel in my P229 from .40 to .357 Sig, do I need to change either of the sights?

The 40/45 use 6 front sight and the 9mm/.357 use 8 front sight. In this case it all depends on the distance you shoot. Put her on a rest and test it out to see if you need to change it for your specific needs.

quote:

Originally posted by Clubster:
The 40/45 use 6 front sight and the 9mm/.357 use 8 front sight.

Thanks. I had seen that before, but forgotten which was which. To reiterate, though, the different front sights make little POI difference.

quote:

Originally posted by Clubster:

quote:

Originally posted by neex:
If I swap the barrel in my P229 from .40 to .357 Sig, do I need to change either of the sights?

The 40/45 use 6 front sight and the 9mm/.357 use 8 front sight. In this case it all depends on the distance you shoot. Put her on a rest and test it out to see if you need to change it for your specific needs.

Just looked this up for another member. Nominally the 357 sig and 9mm use number 8 front and 8 rear. larger numbers up lower numbers down. front moves 1 in, the rear 2 inches at 25 yards. What sight picture do you use? These assume classic Sig combat picture dots lined up and front sight dot covering target. This from real gun reviews Home » Articles » SIG Sauer Sight Heights and Sight Numbers

Thanks for all of the replies.

For my sight picture, I think I go for the classic Sig, if I understand that correctly. Basically, I like the top of the front post even with the top of the rear. I focus on the front sight. I put the front dot on top of whatever I want to hit. Not sure if that's best. It's how I was LEO trained, and it's really hard for me to break the habit when I shoot weapons that aren't aligned that way (e.g. my kid's Crickett or my TX22).

quote:

Originally posted by neex:
Thanks for all of the replies.

For my sight picture, I think I go for the classic Sig, if I understand that correctly. Basically, I like the top of the front post even with the top of the rear. I focus on the front sight. I put the front dot on top of whatever I want to hit. Not sure if that's best. It's how I was LEO trained, and it's really hard for me to break the habit when I shoot weapons that aren't aligned that way (e.g. my kid's Crickett or my TX22).

That is it exactly. I have had to change the sights on my revolvers to be like the classic sig combat sight picture. We were all taught the 6 o’clock hold for revolvers, oh well. I guess put the dot on top of what you want to hit affords positive transfer of training to the red dot reflex sights. What we haven’t discussed is different bullet weights and their effect on point of impact.

I wish my eyes were still young enough for this to matter.

Yes, for those with younger eyes, the height of the sights can be important, even with the factory-installed sights, shooting the original cartridge. One can try test-firing at various distances, and then either adapt, or install a sight that is accurate for one’s most-important distance.

I remember having to adapt, in the Eighties, with my S&W Model 58 fixed-sight revolver. I remember holding at the shoulder level, on a B-27, at 25 yards. This actually helped my 25-yard score, but would have been a liability if a living opponent should have chosen to present a smaller profile.

All this being said I have done hundreds of installs on Sig pistols over the years and I have run into to a lot of exceptions to the rule, almost like they test at the factory sometimes and need to adjust the POA then throw another number on there to fix. Either way I stick with the 6/6 and 8/8 blades an never had issues.

Bench the gun with the new cartridge and make your decision based on that.
Ameriglo Sight Calculator
https://ameriglo.com/pages/sight-calculator

Use G19 (in the calculator) to approximate your P229 sight radius.
Measure your sight heights above the slide.

quote:

Originally posted by DirectDrive:
Bench the gun with the new cartridge and make your decision based on that.
Ameriglo Sight Calculator
https://ameriglo.com/pages/sight-calculator

Use G19 (in the calculator) to approximate your P229 sight radius.
Measure your sight heights above the slide.

sight calculator great add thanks.