Rossi 92 question

[pete-driver]

I finally got to shoot my Rossi 92 45 colt and now I have some questions. I fired my first shot and was hit across the forehead with hot gas. I opened the bolt slow and found the top of the case shiny but the bottom was covered with soot.This continued through the thirty rounds I fired. I'm using a 200 gr. cast bullet roll crimped over 6.5 of Trailboss.
Question #1 is this load too light to seal the chamber?
Next I was hitting high at 50yds. Had to take the ramp out of the rear sight to hit at point of aim.
Question #2 do I get a taller front sight or go to a 250gr bullet?
All of this keeping in mine I plan to get a Ruger Vaquero (or a pair), and I'd like to use the same round for both rifle and six gun. I appreciate you input.John

[Chuck 100 yd]

#1 Yes, The case is not obturating to seal the chamber. Many .45 colt chambers are way oversize and many sizer dies are to small compounding the problem. When I use trail boss in my rifles, I find the best and most accurate loads are pushing the book max.

#2 I would sort out the load first as point of impact will change some.
Have fun.

Looks like 6.5 is the max load for the .45 Colt in IMR data for pistol.
I would check into the chamber vs. sizer die to see what gives.
If it were me, I would go to a heavier bullet. Or try another powder if you are shooting CAS and want to stay with the 200 gr.

[Lefty Dude]

Try a 250 gr., tight crimp and a slower powder like Unique, etc.

The case is not sealing in the chamber.

You might also try a soft cast 200 gr. bullet 20/1.

Also slug your bore. If you are using a bullet not sized for your bore you will get blow-back.

[JerryB]

I reckon that 'Ol Lefty is right about the bullet.I know that most CAS shooters where mygrandson and I shoot use as light a bullet and powder as they can and still get it to the target.I think any gun shooting .45 Colt rounds should be shot with a 250 or 255 grain bullet just because. They will seal the chamber better and feel good too. Unique is all that I have ever loaded for my guns.