James...tight case necks can go a LONG way to creating excessive pressure. Can you push a bullet into the neck of a fired case that has NOT been resized?
But as Kirby says...shoot what the GUN likes. I stated way earlier and it has been reinforced by others that sometimes ego's and bad data get in the way of true carridge performance. It seems that this may be perfect example of that problem!
As to the COW vs bullet firing methods of forming cases...I've done both methods with the same guns on multiple occassions and never had a problem. COW may leave the shoulder slightly rounded but it should be at least 95% formed...enough to start the beginning stages of load development. I love this method...gets all my cases formed and saves a trip to the range and LOTS of $$ in components.
I would really not get hung up on velocity to much. Shoot where the accuracy is best and pressures are comfortable once you get the case neck fit right.
If your 50 fps under what you are supposed to be or even 100 fps less, that will really mean nothing at long range. Its consistancy and accuracy that makes everything work down range, not 50 or 100 fps more velocity.
What velocity is your smith telling you you should be able to reach?
Also, did he actually test that load in your specific rifle or is this just a load that has "always worked for him in the past" type of recommendations.
Velocity output differences can be huge from one rifle to another even with same length barrel and using the same load. Mainly due to barrel to barrel variations, bore diameter mainly.
In my testing, having to tight of a neck fit will usually cause your pressures to spike noticably sharper but it is intersting that in many cases, once you get the neck fit corrected, top velocity potential really does not increase all that much. What changes is your case life and the ability of your cases to be used much longer.
Now if you load them back up to where they are loosening again, certainly you will get more velocity but the point is to get long case life, or at least usible case life anyway.
Keep us posted with your results.
Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.
coy, if I take a loaded round and a fired unsized one it takes alot of effort to force the fired case over the bullet of the fired one, there is no way I could push a bullet in it by hand, my turner arived today, I turned 6 cases to .012 neck thickness, it took alot of effore to get the case on the .264 mandrel. I'll keep you posted.
I understand that I might not get the velocity that others get, but the rifle shoots well with re22, it was punching 3/8's groups while ruining cases.
All I would like to see is 3150 or so with decent case life with some accuracy potential, at 3200 with H1000 about .6" is all I've gotten out of it, I'll let ya know how it goes.
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I turned 6 cases to .012 neck thickness, it took alot of effore to get the case on the .264 mandrel. I'll keep you posted.
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Just thought I would mention I ruined my mandrel a couple of weeks ago, which was the first time I had ever turned fired cases. It started bonding brass to the mandrel. I tried polishing it back and it did it again after the second case I did. Something to watch for. Did you use the expander mandrel on them?
When I ruined mine, It was even after running them through the expander mandrel. I ended up polishing the inside of the necks first and then running them through the expander mandrel twice before I did anymore with the new turner mandrel. I used Imperial for lube. New brass sure is much easier to do.
Good luck with the 6.5.
yeah, brass will gall onto the mandrel if ya don't lube it, my cases turned out very well. I also ff'd a couple rounds with 54 gr of H4831 and a 140 gr, those necks are .012-.013.
So what I've saw so far is this ff'ing with COW/unique pushes brass from the case body to form the shoulder, while using a bullet/powder charge pulls some from the neck.
I have those 3 rounds which I ff'd with bullets loaded with 62 gr re22 and a 140 a-max (as per the smiths instructions) pouring rain here so will shoot one round today and see if it deprimes on ejection, the other 2 I'll chrony as soon as the storm moves out.