Well, I might have done one thing right [img]/ubbthreads/images/graemlins/tongue.gif[/img]I am having anew mike rock bbl.put on as opposed to rechamber [img]/ubbthreads/images/graemlins/smile.gif[/img]
What twist barrel ? What projectiles are you hoping to shoot ?
I have a 9 twist and so far 46.5 gns Varget with the 55gn Nosler has been the most accurate load . Currently playing with the 87 V Max and H4350 which is showing promise at 44.7 gns . Need to come back a little on that .
No luck with the 70gn SMK or BT or 95gn Berger VLD at reasonably high velocities. I like speed and accuracy .
What will be my regimen when i receive my AI? Phew! thats a good un, where do i start?
First off there will much admiration, handling and more admiration, [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]
After my excitement has died down i'll get down to the serious buissiness.
Having had rifles built by my smith in the past, he will supply me with a dimensioned drawing of my chamber,so i can cross reference measurements between 243 cases and the chamber.
Using Redding Competition neck bushing dies i will take 110 new Lapua cases(i bought a case of 500 when i bought the 243) the ten will be for setting up purposes and benchrest prep them consisting of:
1.Run all the cases into the neck sizing die to size them enough to be expanded.
2.Expand all the necks on the neck expander mandrel.
3.Trim cases to length of the shortest case. de-burr case necks and remove sharp edges with wirewool.
4.I will then de-burr and chamfer the flash hole and uniform the primer pocket depth ( this may have to be done several times before the brass settles down).
5. At this point i will neck turn because i will have specified a chamber tighter than saami specs. You may not need to or want to neck turn but i think it is essential for consistant neck tension.
6. After neck turning i will de-burr the outside of the neck very gently and cut a VLD chamfer on the inside and once again remove sharp edges with wirewool.
7.After selecting the appropriate neck bushing, i will size the necks to give approx. 002" to 003" of neck tension.
8.Priming will be carried out with Federal 210 Gold Match primers.
9.For a fireforming charge of powder i will select a top end load of medium burning range for 243, from the tables out of one of my manuals, something like W760, H380 or H4350
10.Using the rod down the bore method, i determine the cartridge overall length and then seat a bullet so it is hard into the lands.
We are now ready to start fireforming and enjoying ourselves at the range. [img]/ubbthreads/images/graemlins/smile.gif[/img] [img]/ubbthreads/images/graemlins/smile.gif[/img]
My barrel break in process is a little different, ie, i zero my scope first, i can usually do this in 3-4 shots after boresighting, i quote "usually". [img]/ubbthreads/images/graemlins/wink.gif[/img]
Watch those beautifully fireformed cases pop out each time you work the bolt! More admiration. [img]/ubbthreads/images/graemlins/grin.gif[/img]
From then on, one shot and clean five times, three shots and clean three times and finally five shots and clean two times.
As i usually spend two days at the range, overnighting in the Clubhouse i will most likeiy get all of my fireforming done and can start load developement, although i will be taking chrono readings and notes while fireforming.
I hope this gives you some insight into how i would do things and even though the case prep can be very time consuming ite all worth when you are out in the field or on the range. Enjoy your shooting.
Centrepunch,Thanks for the effort,man ,that was alot of work!The only real difference for me is that I did'nt order tight neck.I just dont want to neck turn.After the initial fireforming I plan on using the ladder method as described by Abinok to develop loads.BTW where is your range?Although I spent a lot of time in Scotland I did'nt go to England very much.Scotland has some lovely long range vistas,you ever get up that way to shoot or is it not that simple?Since I was in the military while there the ins and outs of what civilians could was never clear.Thanks for the info., look forward to exchanging load development news. Jim
Centrpunch, Are you saying you will use your chamber dimensions to order the appropiate size bushings to neck size initially?Also , just received a batch of lapua brass,man!, I've checked these things nine ways to sunday and I'm not sure I should do anything to them but neck size then load [img]/ubbthreads/images/graemlins/cool.gif[/img]I obviously, have never used lapua before so this is a revelation .They are all the same length,weight within .2 up or down ,case head size,and zowie! inspection with a strong light source and magnifying lens of the flash hole reveals perfectly clean,clear holes,magnifique! [img]/ubbthreads/images/graemlins/laugh.gif[/img] Oh well going back and do some more drooling, Jim
jimm: welcome to European made shooting products. I'm willing to bet U.S manufacturers pray the shooting public never finds out what has been missing from them for low these many years. It's not that they are not capable of these standards, they just don't think the market is big enough to justify the cost. Once again the rush to mediocrity rears it's ugly head. But don't we see this in most U.S. made products? [img]/ubbthreads/images/graemlins/confused.gif[/img]
"A HUNTER SHOULD LIVE OFF HIS GUNS" JOHN TAYLOR