.45 colt sizing question...

[waco]

so my new Cimarron has throats that all measure .453 except one which measures .454
i used a telescoping guage and a micrometer.
my question is would it be best to size the boolits to .454?
one thou over the throat should be ok, right?
no, i have not slugged the barrel yet.
thanks in advance.
waco

[Heavy lead]

Well Waco, I size .454 for .4525 throats with no problem.

[RobS]

I would go with .454 if the boolit's front drive band doesn't extend out into the cylinder throats. If your boolit design does then you'll have to go .453; hard pushing a .454 object into a .453 hole. The one cylinder throat may give that dreaded flier???

[waco]

Mold is Rcbs 270 SAA.

[RobS]

The front drive band might very well extend into the cylinder throats and if so then .453 is what I would size to. I ran the RCBS 270 SAA in my 454 casull SRH and the front drive band extended into the cylinder throats which is what I prefer as centers the boolit up in the cylinder for a straight alignment to the barrel, well as straight alignment as the cylinder is to the bore. I size to my cylinder throats as the boolits I design or use will typically extend into the cylinder throats. Additionally, having more boolit outside the case is good though as it gives more room for powder. :)

[littlejack]

waco:
Glad to hear your "Evil Roy" came in. Now the fun begins. Hope you have no problems.
Jack