LexRick
Well-Known Member
I've been a member for a year now. Ive read plenty of coments about run out when resizing im not completely sure what it is. Could someone explain
Run out
- Thread starter LexRick
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LexRick
Well-Known Member
How can you control this. Is there a tool to use.
nksmfamjp
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- Jan 5, 2004
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- 3,351
I agree....what are your results when correcting? My 1/2 MOA rifle shot 1.5 MOA groups when I corrected.
nksmfamjp
Well-Known Member
- Joined
- Jan 5, 2004
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Hornady's concentricity tool will allow one to adjust.
LexRick
Well-Known Member
Reason im asking is i have a 7mil stw and am having troble finding a consistent group. I thought it was the lee dies im using becsuse ive noticed a difference in oal after resizing.
Where are you measuring a load round for OAL? What bullet is being used? If it's an open tip/hollow point bullet like a matchking, the tips (meplat) are not going to be consistent. If measuring base to tip of the loaded round it will throw you off.
Yup. Here's a pic. Easy to use and worth every penny.
Savage 12BVSS
Well-Known Member
I only noticed problems with accuracy when correcting rounds that were .003 and above, you risk bending or pushing the case neck out of round with the force of tweaking them straight. If you use good die's (forster benchrest-whidden-redding) and remove the sizer button and stem from the sizing dies, you will greatly reduce runout in loaded cartridges. If you neck size with mandrel expander dies (sinclair style) or collet mandrel dies (lee style) it will further reduce runout in cartridges. Some presses with movement in the dies or shellholder to align dies and cartridge better (mec marksman-forster co ax-rcbs summit) will also help get you there with runout. Turning the cartridge at least once or even twice in the bullet seating stroke can also help in the runout elimination attempt. I produce loaded ammo that runs between .0005 to .0015 for four different cartridges, anything over .001 gets a light tweak on a hornady gauge pictured above to keep all rounds under .001 runout.
Some believe its unnecessary to adjust or care about runout, others do and can see the difference in a tight shooting rifle with a good marksman. I believe when you get to 1/2" or better its a worthwhile addition to your reloading methods. Its a no brainer that it's not going to make accuracy any worse to keep ammo straight as possible and its the tweaking hard on very high runout loads that can cause even greater problems than ignoring it all together. All IMHO and and with hands on experience, its not going to make a MOA gun suddenly shoot 1/4" groups of course.
Some believe its unnecessary to adjust or care about runout, others do and can see the difference in a tight shooting rifle with a good marksman. I believe when you get to 1/2" or better its a worthwhile addition to your reloading methods. Its a no brainer that it's not going to make accuracy any worse to keep ammo straight as possible and its the tweaking hard on very high runout loads that can cause even greater problems than ignoring it all together. All IMHO and and with hands on experience, its not going to make a MOA gun suddenly shoot 1/4" groups of course.
My results are everything maintains sub MOA. I've never seen groups open up as a result of using the gauge. Truth be told however, I don't have any empirical data to back it up but I figure whatever I can do to keep things concentric is contributing to accuracy. It feels good, so I do it.
Now, with regard to dies - with RCBS I average .003-.004 runout and I correct them. With my Redding dies, I don't even bother to check anymore.
Deputy819
Well-Known Member
LOL! Somebody could REALLY run with that one..
I actually sold my concentricity tool for THIS very reason...
misterc01
Well-Known Member
My my last check after reloading my precsion rounds is the conentricity gauge. If I have done everything correctlty, by that time I need very little correction (force) to get to my personal goal .002 or less.
I only use my Hornady tool to check for runout , if I find it , I narrow down to the cause and correct it in the loading process ! I don't like to ( push ) the bullet/case straight because it messes with neck tension causing another potential issue and possibly sending me down a rabbit hole ! Lol
