LDBennet;

I have owned three M52's, all have shot very accurately.
Sold the two M52-2's and kept the 1968 M52-1 that I currently shoot in the center fire bullseye matches.
Kept the 52-1 cause I thought the extraction was better than the updated 52-2's.
Just sent an extractor that I do not need anymore to a shooter needing one in his 52-2.
I think the secret to not have any problems with the 52-1 extractor is to never remove and try to reinstall it(cause you will bend it which I believe will cause a failure) and keep it clean with a toothbrush in the claw area.
I have thousands of rounds through mine without incident(knock on wood).
Your load is fine, no need to push it that hard for good groups or anything for that matter.
I load Remington 148gr HBWC over 2.8gr Bullseye powder.
My best center fire score to date is an 872-26x
If you take the time and learn to shoot this awesome target pistol you will be rewarded.
It is a very unforgiving pistol that will show you any errors in hold, triggering and follow through that you have.
That said, enjoy your M52.

Clarence

__________________
B.E.Master in&outdoor
D.R.#99