.001" or .002" over bore size?

[Fugowii]

I slugged my Win '94 in .32 Win Spl and it came in at .322" Bore is in excellent shape.
Do I want to size .323" or .324"?

Thanks,

F

[mooman76]

I'd go .324 if it were me and it would chamber but that's just me. Either should work though.

[Buckshot]

..............You really mean 'Groove", right? Sorry, can't help myself.[smilie=l: mooman76 said what I would have said. Basically you can size to the throat so long as the case has room to release, and the throat isn't out of bounds on it's measurement.

................Buckshot

[Marlin Junky]

It really depends on boolit hardness, powder charge and barrel conditions but knowing what I know about M94's, I say try both diameters if you have both dies. If you're trying to decide which die to acquire as a first purchase for this particular rifle, I say get the larger of the two unless you know precisely that your groove diameter is a maximum of .322"... you did check it at the throat with a quality micrometer, right?

MJ

[Char-Gar]

99.9% chance you can choose between the two and never notice the difference.

[Harry O]

I used to size 0.001" to 0.002" over groove size. A few years back, I tried some experiments. In each test I tried (with both handguns and rifles), I found that the best accuracy was with a cast bullet that was as large as could be chambered. At times this was 0.005" over groove diameter (in a 9mm Browning Hi-Power). I do that any more.

[casterofboolits]

Browning Hi-Power bores run high, up to .360. Mine would tumble at three feet with a .356 boolit, but was extremly accurate with an H&G 125 SWCBB sized at .357. The .357 would clean out the leading left by the .356 boolit!

[NVcurmudgeon]

There are tolerances in lubrisizer dies, compounded by the limitless variation of alloys that we use. Once upon a time I sized 9mm boolits .357" in a rare Lyman die that sized exactly .357". I then bought another Lyman die marked .356" that sized .357" with the same alloy and boolit design. Yes, I am gray headed and will always believe that chasing the elusive "perfect" sizing die caused it.

[Marlin Junky]

There are tolerances in lubrisizer dies, compounded by the limitless variation of alloys that we use. Once upon a time I sized 9mm boolits .357" in a rare Lyman die that sized exactly .357". I then bought another Lyman die marked .356" that sized .357" with the same alloy and boolit design.

Exactly... however, lately I've been needing to polish the heck out of them in order to size near the diameter stamped on them and occasionally they still come out almost .0005" undersize using WW alloy (approx. BHN 12). BTW, clip-on WW metal is all you'll ever need in that .32 with its 16" twist and if you water drop or heat treat them, you should be able to beat factory velocities somewhat while retaining fine accuracy.

MJ

[9.3X62AL]

I've come to the point of first trying autopistol and rifle boolits at throat diameter, and almost always get zero leading and reasonable accuracy at the beginning of cast boolit explorations in a given firearm. Revolvers get tried first at cylinder throat diameter, and I can't think of a time that the practice didn't work out.

If ya know the right question to ask the gun--it will give a good answer of its own volition.

[RobS]

If ya know the right question to ask the gun--it will give a good answer of its own volition.

Good point as every firearm is different. With that note I usually have better luck sizing to the larger diameters regarding accuracy especially in revolvers that is if the throats will let me.