gp100 throat size and cast bullets

[30hrrtt]

I have a 357 accusport bisley and shoot cast bullets with it. The gun has been firelapped and bullets sized to 358 are snug fits going through the throat.

I just bought a gp100 and the 358's won't push through the throats. 357 jacketed bullets are a snug fit.

I would like to shoot the same size cast in both guns. What does shooting cast bullets slightly larger than throat size do to accuracy and pressure?

The other option is to ream the gp100 throats slightly larger so both guns are the same

I did slug the bore and the bore is slightly smaller than the throats which is good.

Any comments on either solution?

[IcerUSA]

Load up a couple and try them , might like what you see on paper . :)

Keith

[MtJerry]

Shoot them at .358 and you will be pleased.

Mine is sized the same as yours and loved boolets sized .358

[Ricochet]

Only problem's if you've got something like .357" throats and .359" groove diameter. If the throats are equal to or bigger than the groove diameter, it's great.

[30hrrtt]

I measured and the throat size is larger than the groove.

My assumption was that the bullet needed to be sized for a snug fit in the throat. If it is a little bigger than the throat, 358 bullet in a 357 throat, will the pressure go up prematurely?

[Ricochet]

Don't expect it'll be an issue with lead alloy bullets.