I am hoping the 34 is a 5" barrel.....

124gr plated RN is a good practice bullet and it can be good at 970fps, 1020fps or 1180fps for a low vel. practice load.

I have good accuracy with Bullseye, Red Dot, Cfe and HS-6 powders with the 125gr bullet.

The 135gr plated was not to good for me but the 147gr worked.
Minimum load was 805fps with HS-6 up to 874fps with Bullseye.
If the 124grs don't work out for you, the 147gr might be just the thing for your accuracy load, since it likes a lot of powders.

The Blazer 124gr in a 4" should be around 1090fps.
You did not mention what powders you have.

Good luck.