Jumping,in the lands or jamming

[L.Sherm]

I find .002 to .002 + for my Target Shooting single loading works 99% of the time.

I find .002 works in my 17 and 20 cals but .003- .005 in my 6mm- 30 cal magnums

 

[No i deer]

What XTR said. You may well have a .002 runout on your loaded rounds. But if you are jumping or jamming say .010 or more, and you have that .002 runout, your jump is still a jump and visa VERSA. If you try the "JUST TOUCH" length, and have that same .002 runout, you will have issues. Accuracy, ES, SD, PSI, ETC... will be erratic. And, if you are on the edge, PSI wise, with a little jump, and that turns into a jam......??

Just my .02,
Tod

I've never tried measuring the runout.
I thought that was another rabbit hole to go down..
I've had the same die for years..
Maybe 8 or more years..
Not kept count..
The gun has has shot well over the years.. this barrel loved the hybrids and amaxs..
After my recent tweaking has made all the difference..
Just not got there with the 130gr eldms yet..
The 140gr hybrids not long ago.
140gr amaxs the same day

 

[No i deer]

It’s the reason I spent just a little time at the 100 yard target and most of my time at the long distance target and I’m using the chronograph at both. I’m not going to test 100’s of rounds at the short distance just hoping that once I find that magic velocity that’s just about equal. My intention is to make small groups at long distance and the only way to assure that is to shoot the distant target. While a projectile should track the spread as distance increases, sometimes it doesn’t and I need the magic at the long target. I’ve had one hole 100 yard loads go to 1moa at 700 yards and 3/4 moa 100 yards loads go to 1/2 or smaller moa at 700 yards with “high” es and sd. Consistently. I shake my head at others that spend excess time at the short range when their goal is distance. I’m spoiled because I have a 700 yard range and a 100 yard that I shoot from inside my shop but I still used the same behavior before that was possible. I always loaded for long distance and I made sure my target was large enough to capture my bullets. I refined my equipment and skills to make everything work at distance. I always say to the hunters that if it’ll shoot 4 inch groups at 700 yards, it’ll always be a kill anywhere between you and 700 yards if I point it in the right direction. If it opens up to 1 inch at 100 yards it’ll still be better than 4 inches at 700 yards. A head shot is a head shot and I can get it between the distances.

I'd test at long-range if i had the access to it..
My load development is done on a permission at 100yds..
I have some American f class friends and they do it differently to us..
Most here are shooting small from 100 to 300yds which usually means it'll shoot small at 1000yds..
Tweak the tuner if needed..
Longrange ladders and small powder charge testing seem the more normal thing over with you'll..
I'd try it if It was more convenient.
Tim Vaught showed some targets posted by Alex Wheeler on his 6.5/7 PRCW thread..
I could hire a lane at Bisley and do a longrange test..
Only thing it's about a 4.5hrs drive there and back...
That's usually the acid test for my rifles after my 100yds load development

 

[JFrank]

That's interesting..
I try to make my load development less complicated by sticking with 1 neck tension mandrel and the same primers...
Component prices over here have got silly..
Bergers 7mm's are £100 plus a box approx
Primers £25 per 100 approx BR4's
Powder £115 per kilo approx N165
Brass is expensive too Lapua/Norma

Neck tension is free, except for a few components that I’d shoot regardless.
The way I look at it is if I don’t test, I’ll get beat for sure but if I do test stuff and find additional accuracy and consistency then I’ll at least have a chance to shoot well and not be just throwing away entry fees plus components.

 

[No i deer]

You'd load up with say 5 different neck tensions.
Test, pick the best results then fine tune the seating..??