I shot 6 with 8gr Unique CCI LP pistol primers, and another 6 all the same except I used The CCI Magnum primer instead.
The standard primer load was more accurate than the magnum pimer load as it shot within an inch of the sight @ 25yds. Where as the magnum pimer loads grouped sporadicaly. I also noticed that the recoil was still quite noticable with these loads, at least more than what I thought my 40 S&W recoils anyway. The standard primer load was an inch low. So I am thinking of going to 7.5 grains in hopes of bringing the bullet to the sights but I think that might be to low a charge.
The other thing that I found was that even the "NEW" Unique is still an awfull dirty powder and that I was getting a lot of leading in the forcing cone area. When the brush was taken to the barrel I was getting long strips of it from the bore . So the jury is still out on this particular load combo, accuracy is good but I can't beleive the ammount of cleaning it took, I think I still have some lead washing in the throats as well .

Most of the "flake" style pistol powders (including the rolled ball types like W231) neither need nor like magnum primers. Milder is better with those powders.

7.5 to 8.0 shouldn't be that dirty even with Unique, but if it bothers you, try W231, Nitro 100 or Scot 1000 all of which are clean to very clean burners.

You leading near the breech end is indicative of either too hard a bullet or one that's too small in diameter. Or a combination of both.

thanks rocky, I went out today and bought some Lee liquid alox lube. Lubed up 6 bullets am hoping that this takes care of it. I am starting to think that the bullets are to hard as you suggested. Hopefully the accuracy will not go to pot.