A very hot!!!! F-Class Match Saturday

2145 Views 22 Replies 9 Participants Last post by 300 ATLAS, Jun 29, 2010

mildot

Discussion Starter · Jun 27, 2010

X-Ring put on another great F-Class match Saturday down at Bogue Chitto MS range. Had a lot of good shooters show up and a few new guys came down to try it out. Let me tell you it was hot. We set up fans in the target pit to move a little air for the guys working the targets. I have located a few more blowers :shtf2: that we can place at the firing line next month. For those of you that have not tried this, you need to come on down but I warn you if you ever shoot a match you will hooked, the next match will be Saturday July 24.

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300 ATLAS

· #21 · Jun 29, 2010

Limbic,
The .264” loaded round gives me .0105” neck walls. An unturned loaded round is approximately .268”-.269” with .0125”-.013” neck walls. By turning .002” of brass off of the neck, I can guarantee that I get perfect necks, resulting in consistent neck tension. Without neck turning, you are at the mercy of the case manufacture’s quality control. I know that there a bunch of guys that say that they have done testing and some of the Lapua cases are good enough for accurate rounds. I am not sure that they are being honest with the rest of the shooting world. The rest of the shooting world is their competition! Take a new piece of Lapua 6mmBR brass and run it across a expander mandrel and neck turn just .0005” off of the neck and you will see the high and low spots down the neck. Then set it to take .002” off and it will be completely clean.
If I am going to spend the money to have a reamer built to my specs. it will have a tight neck.

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Limbic

· #22 · Jun 29, 2010

Makes sense. What about run-out. Mine, with unturned necks, is about .001-.002 and I'd guess that yours is zero.

When you begin to turn your necks where do you start? Just down on the shoulder? Also how do you take off a certain amount, such as .002. When I turn for my 260 I set the cutter down on the neck just a bit. Manually turn the device and what comes off comes off. I have no control over if it is taking the neck from 294 down to 292 or 291 or even 290. I have a micrometer to tell me what I've done but I don't have a clue what I'm doing till Ive done it..

That last sentence even confuses me.

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300 ATLAS

· #23 · Jun 29, 2010

Runout is very, very low. I also use a Neil Jones Micro Hand Setting Die with a .265” bushing and an Arbor Press. So once the bullet is seated there is only .001” total clearance between the seating die and the loaded round.
On my .300 ATLAS I use Sinclair’s Expander Mandrel and Neck Turner. It is set to make a .332” loaded round for the .334” chamber and it is locked down and never adjusted.
On the 6 Dasher I use a K&M carbide fluted expander mandrel and K&M neck turner. It also is locked down to make the .264” loaded round and never adjusted.
It is trial and error on getting a turner set for depth of cut. I do NOT set the Mandrel stop for length! I run the case with a cordless drill slowly. I run it in the turner until the cutter just bumps the shoulder and gives it a shine at the NK/Shoulder junction. You can run your fingernail across this shiny spot at the junction and not or barley fell the cut. Just keep turning, adjusting, seating a bullet and measuring until you get the desired NK dia… Then lock the cutter down!
Nothing to It. Just time. Also after the case has been turned and fired w/ a full charge expand them again and run them through the turner for a second and final time. PERFECT Necks!

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