help with 158 gr lswc's

I get excellent accuracy with 2.7 gr bullseye with 148 gr hbwc's.
I need some help with 158 gr lswc's. I have loaded them with 2.7 to 3.5 of bullseye powder and the accuracy is not very good.
I am loading these in 38 cases and shooting them in my S&W model 19 with 4" barrel.
What could be the problem or what am I doing wrong ?

I have seen plenty of feedback on this site relative to accuracy issues with LSWC at 50 yds. I tried them as well as round nose and found the round nose to be much better. I am using 3.4 grains of Titegroup.

How does it compare with a factory 158 LRN or 140 to 160 gr Jacketed?  Some of this may be the gun itself.  m19s are good but the best revolvers were the Python, Diamondback, Officers Model Match and the K-38 with 6 inch barrel and th 586.

Try some .magtech or American eagle 158 loadshttps://www.bullseyeforum.net/t2221-distinguished-revolver-loads-that-don-t-suck?highlight=distinguished+++%2Bloads

You should try 158gr LRN.

I've been successful with the 158 lrn bullets as well with 3.4 gr of Titegroup.

I switched from SWC's to RN.  They perform much better in my Model 14.  I've been using the 158 RN bullets from Bullet Works in Breckenridge, Texas.  They have a slightly longer body than other RN that I have found.

I use factory ZERO or Remington Ammo for Long Line Matches and reload Swagged SWC for practice and the short line. 

I have been using the Zero Swagged bullet over 3.0 gn of bullesye for the short line a nice roll crimp and OAL 1.46. 

However if you are shooting the revolver in a CF match I would go with WC over 2.6-2.8 gn of BE.