Setting up and adjusting resizing dies with Cam-over (An EXTREME RELOADING Special) 

You are welcome Aaron. Always good to see your posts. I trust all is well with you.

I have not looked at the Whidden gauge. Thanks for letting me know about it.

Thank you very much. Will do :)

You are welcome.

Do you have a chronograph?

Hello and thanks for watching and posting. What you describe is not really uncommon. There could be a number of things going on and the first is that as you start shooting at longer ranges slight (and sometimes very slight) shooter errors start to creep into issue. Even if the person is shooting from a bench or a very solid prone position with a good bipod etc, things like precise and consistent sight alignment, very consistent trigger squeeze can all start to show up at longer ranges. Even the ability to absolutely clearly see the bullseye and your reticle becomes more difficult at 200-300 yards. I feel my 200 yards groups are pretty reliable with little shooter error introduced but I also feel that I am started to see shooter error when I shoot groups at 300 yards and beyond. You could look at your load also and as another viewer already responded, use a chronograph to check the muzzle velocity of your loads. If the standard deviation (SD) is above 15 (ideally we like to see single digit SD) then that can explain why your groups are opening up at longer ranges. I hope this helps.

​yes I do. I'm shooting a 6.5x284 Norma 140grain Berger VLD at 2713,2720.2705.2709.2711FPS. H-4831sc-49.2gn Had same issues with 130gn having issues finding slower burning powder normal powder is H-1000 no issue's thank you kindly

It all helps an makes me practice on all aspects this is my 5th rifle in 52 years same caliber I practice to 500 yards every Thursday my best friend did all the loading for me an he is with the Lord now. I never new till I started reloading the work he put into the rifles he built an did load development for me. I do shoot my other rifles good at fairly long range for myself 500yrds but will keep working on your thoughts thank you for answering your the only one that speaks volumes to me.

@@leeNWHuntinganFish4713That's excellent Lee. 5.5 fps SD and a mean of 2,711 fps. Nice job!

Thank you!

That is a good question Florian. I have tried so many dies over the years and my preference for resizing dies is based on measurements made after resizing. I have found (what I am calling premium dies) consistently resize the cases to the SAAMI spec I am looking for. With some other dies I found I had to sometimes resize a second time to bring some cases back into spec. The measurement I like to use is the CHE (case head expansion) measurement. It is useful as a normal case prep process and this is the one that really differentiated the premium dies from the standard dies for me.

Thanks for watching and posting. I have found that any blanket statement regarding the best jump to the lands is almost always wrong and due to simply not enough experience with a variety of bullets and loads. Some bullets are far more sensitive to jump and these tend to be bullets with a secant ogive (Hornady does make a number of bullets with a secant ogive). I have done some tests on this and the best advice I can give is to experiment with bullet seating depth until you find the one that your rifle really likes. Try 0.002" increments and just make sure you do not seat it out so far that the bullet actually touches the lands... that could be catastrophic. I also am beginning to think over the past year or two that it is not so much jump to the lands as it is changing barrel harmonics that is really making this change. I say that because some of my testing has shown a sigmoidal (or S-shaped) curve in group size as I change bullet seating depth (or jump). If the distance to the lands was actually the driver of precision we should see a linear curve (straight line). I hope this helps.

Good question Jeff. I stopped neck-sizing a number of years ago. Kind of went full circle on this... I originally only full-length sized, then I neck-sized for 3-5 loadings before FL sizing again, but now only use FL sizing. That change happened when I started annealing for my precision rifles and when I started reloading for semi-auto rifles. The 0.002" bump started as a rule of thumb or suggestion as a starting point from a few manufacturers. It was picked up as gospel and propagated from there. I call some of these things, reloader's voodoo. I may be guilty of some of this also but try my best to best to base all my practices on quantitative data. I hope this answers your question.

@@sdkweber yes, but…how much does new brass move on the first firing, then the second, then third? Is it more then .002” or less. Seems if you just push back .002” every time then the cases will grow progressively longer or shorter unless the brass grows the same. Seems like you need to need to fire form to your exact chamber size subtract .002” and that’s your die setting for the rest of that rifles life time. No one ever explicitly says to do it that way. My new strategy is to neck size until my chamber Is tight, measure, subtract .002 then set a die and after annealing and use that setting for all brass with a full length Redding elite die with a bushing for .003 neck tension then mandrel to .002. Thx for the response. I enjoy your content.

@@ACGuy1You are welcome Jeff. It sounds like you have a good approach that works well for you and your rifles. Keep it up!