So I shoot a load with those cutting edge bullets solids right now, it's from Aria Ballistics, I decided to give them a shot, and from my experience I'd tend to say, proceed with caution, but we'll shelf that, I've got a couple new loads to test before I determine whether I'd completely trust them.
The load I have from them is advertised at 1800fps, that's from that same gun you have, 8 3/8 or whatever barrel length.
My gun has a custom 1/12 twist 4" 'ish, I suppose barrel, 5" total length or thereabouts including my little muzzle brake on it.
I got around 1500fps out of that load through my gun.
So I didn't mean to say that that load is definitely too hot, just to note that, as an all copper solid, that bullet will be longer in comparison to a normal lead hardcast, and therefore speed vs pressure may be deceiving.
The Aria Ballistics load, by the way, has the bullet seated out a good bit further, so, yes, it's claimed 1800fps vs your 1700fps, which means it should be higher pressure, but given seating depth, we don't know that.
Anyways.
What a guy does see that concerns me a bit is your extractor star, between those bottom two cylinders, not only does that point look cracked but the gap between that star point and the cylinder looks blown out on the left side as we look at it.
Further between the star point on the lower right chamber and the right chamber, inside that right chamber, the inside corner looks as though it's missing.
See to what I refer, just above the yellow lines I've drawn, those areas concern me. I actually went and pulled my 500 out to check and mine has none of that. That may be evidence of shooting very hot rounds, may just be abuse in general, I can't know, perhaps it's just the lighting or something, but it would concern me.
Has that gun ever been fired and had a primer blow, or multiple primers blow in those chambers?
I'm not a gunsmith, so I don't rightly know what could cause that or if it is something that should be of great concern, but it'd concern me enough I'd be talking to a smith. May not be a difficult part to replace.