.338 throat?

sdeering

sdeering

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I am about to chamber my first 338edge.
The reamer I have has too short of a throat I'm thinking for the 300SMKs, which I would like to shoot. I have a throating reamer on the way. If I throat it for the 300 SMK how well have these shot the shorter hunting bullets? What bullets have you guys been using for elk, deer? The barrel -30" progressive twist to 9.5 from RKS.

Hears the print of the reamer I have. It looks like the throat will have to be .100" longer thereabouts, so I can keep the SMK out of the doughnut.
Any help would be greatly appreciated.
Stephen
 
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Load up your round and see where you are at before you use the throater. Remember, a throater cuts almost effortlessly, like a hot knife through air, not butter. I use my tail stock indicator which is in .001's.
 
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I was doing some measuring on the reamer and it looks like it has about .150 from the end of the neck diameter to where it is measured .337 It looks too short to me. Ya I wont be doing anything till I have the camber cut and do some measuring with a bullet and case.
Thanks for the help. I will get back when I have made some headway.
 
sdeering said:
I was doing some measuring on the reamer and it looks like it has about .150 from the end of the neck diameter to where it is measured .337 It looks too short to me. Ya I wont be doing anything till I have the camber cut and do some measuring with a bullet and case.
Thanks for the help. I will get back when I have made some headway.
Click to expand...

Dimension given for length of throat on reamer print is .148.

NormB
 
NormB your correct in the dimension given, I was not correct on the diameter.

When people ask or talk about the length of the throat what they usually mean is how far away does the throat start. This is actually called the lead or freebore. The throat measurement is determined by its angle, which we want to be 1.5`.

On this reamer, the length given for the throat is at a diameter of .325". This is somewhere along the ogive but likely further away than where the bullet will contact the barrel. It does give .148" for a lead/freebore dimension and .165" if you include the 45` transition from the case mouth. That does not sound like enough for a 300SMK. However, your golden with the throater coming.
 
You can seat the 300gr MK into the case to fit the orig throat. It is not the end of the world and it can shoot just as accurately as being longer. I like my ogive 10 thou OFF the lands.

Best is to cut the chamber then find out if the throat is to your liking. If mag feeding, you may not want a longer leade.

If you do, a throater can be used to get the beginning of the rifle where you want based on the loaded rd. I know you can measure and remeasure then figure a mathematical solution.

I just build the cartridge I want, then run the throater in to fit.

Simple and works.

Enjoy your new cannon.

Yes, the 300gr MK has lots of useage and is a known quantity on game. Lapuas have had issues in the past. Bergers are too new to know for sure and little bullets for those to test.

If you are not going all that far, the 250gr family is a whole lot of whoop a$$ too.

Personally, I would shoot the rifle with the orig chamber with BOTH 250 and 300gr bullets to see what the barrel likes.

You can always cut metal. Putting it back - not so easy.

Jerry
 
Thanks for the help fellas.Your always full of good ideas. I will try the chamber as is and see how it does. I have 225 Nosler accubonds to to try out as well. I have a DE brake on the way hopefully it will make the bigboomer tollerable.
Stephen
 
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