10MM Magnum

[REDLINE]

I agree that no barrel/cylinder gap should be .012", but it is my understanding that even if none are now, some used to be.

Freedom Arms generally ranges from .002"-.003", but that's really tight!  I think most Ruger revolvers are around the .006" or so you mentioned.

I've heard pistol silhouette competition shooters say the Freedom Arms gives 100fps additional velocity with same barrel lengths compared to Ruger revolvers because of the Freedom Arms extra tight barrel/cylinder gap.

[sqlbullet]

I submit its a Service-Six not a SP101, but thats semantics. kick ass just the same! 

The OP later clarified it is a GP-100 (Service Six revised-ish) towards to end of page one.

But it is a sweet gun either way.

[475/480]

Brass is Starline , Primers are WLP .
Here are some numbers for the Nolser 150 gr HP.
AA9-19.0gr =1359-----> 21.0gr =1523
H110- 22.0gr =1368------->24.0gr =1501
Blue Dot-16.0gr =1508------>18.0gr = 1644
-------------------------------------------------
Here are some Hornady 180gr XTP numbers..
AA9-19.0gr =1445-------> AA9- 20.0gr=1520 fps , very accurate load at 15 yards
H110- 22.0gr =1470--------> H110- 23.0gr =1530 fps
Blue Dot- 15.0gr =1420--------->Blue Dot -16.0gr =1510 fps
--------------------------------------------------------------------
220 gr Cast Keith -a .410" caliber cast bullet sized down to .401"
Blue Dot -11.0gr =1076-------> 12.0gr =1180 - shot good at 15 yards.
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255gr Cast WFNGC - a .410" caliber cast bullet sized down to .401". Very accurate at 15 yards.
AA9- 16.0gr = 1283--------->18.0gr =1408
H110- 17.0gr =1257--------->19.0gr =1365
Blue Dot- 12.0gr =1199--------> 14.0gr =1320
-----------------------------------------------------
Sean

[475/480]

I agree that no barrel/cylinder gap should be .012", but it is my understanding that even if none are now, some used to be.

Freedom Arms generally ranges from .002"-.003", but that's really tight!  I think most Ruger revolvers are around the .006" or so you mentioned.

I measured the cylinder gap this weekend - A .004" gauge would fit and a .005" would not fit.
So .0045" it is.

Sean

[The_Shadow]

Those 10mm Mag numbers are great and I am still amazed at the efficiency of the Blue Dot powder, at providing  good numbers whit reasonable pressures in most any cartridge/bullet weight combination! 

[REDLINE]

I agree that no barrel/cylinder gap should be .012", but it is my understanding that even if none are now, some used to be.

Freedom Arms generally ranges from .002"-.003", but that's really tight!  I think most Ruger revolvers are around the .006" or so you mentioned.

I measured the cylinder gap this weekend - A .004" gauge would fit and a .005" would not fit.
So .0045" it is.

Sean

Thanks for posting the actual measurement.  Based on all I've heard that's relatively impressive.

[hunter58]

Clements Custom Guns also offers this conversion on the GP100. Been thinking I may need one.