Can it? Have you actually shot some groups with the new loads at 200 to confirm the effect?
Seating length question please.
- Thread starter jimmy milnes
- Start date
jimmy milnes
Well-Known Member
When I did my load work I found that Inc of .3 made the difference between a ragged hole an probably if my memory serves, under 10mm now maybe I've a fussy gun I don't know but x that by 2 or 3 an yes there's a chance I could miss I'd say.
The more I think about it the more I'm swinging to my theory of the die not pushing in the place I'm measuring.
.3 is 30 though though, not 6/7, I’d shoot a group and see if they do the job before worrying too much about it personally
jimmy milnes
Well-Known Member
.3 is 30 though though, not 6/7, I’d shoot a group and see if they do the job before worrying too much whoops aye guess you know what I meant though
How do they shoot?
What are you measuring them with?
I would argue that the down range effect of a 4thou OAL (i assume you mean to ogive) is negligible in field conditions.
Bullet ogive is very hard to measure accurately and is dependent on a number of angular intersections and having a measuring device capable of measuring to sub thou accuracy without any user interference
(Squeeze those calipers and see 5thou pop up on the display easily)
the radial curve you are measuring can easily skew a lateral measurement by a significant amount by only being out of spec by a significantly smaller degree.
What are you measuring them with?
I would argue that the down range effect of a 4thou OAL (i assume you mean to ogive) is negligible in field conditions.
Bullet ogive is very hard to measure accurately and is dependent on a number of angular intersections and having a measuring device capable of measuring to sub thou accuracy without any user interference
(Squeeze those calipers and see 5thou pop up on the display easily)
the radial curve you are measuring can easily skew a lateral measurement by a significant amount by only being out of spec by a significantly smaller degree.
Cows94
Well-Known Member
I had similar issues with once fired Sako .223 brass through my Hornady dies. OAL I was aiming for is 2.224. Had variation between 2.219 & 2.228. It gave me the fear to start with. I've fired 70 of the last 100 I loaded now, all at living stuff at not missed. Bowled a crow over at 230m this week easily. Unless you're target shooting over big distances I wouldn't be overly worried
MountainStalker2
Well-Known Member
If the seating stem is contacting the plastic tip of the projectile before the shoulder on seating, then that is where some of your variation is likely coming from. A bit of variation in length is to be expected. I your aiming for 20 thou jump I'd not be worried unless my groups told me it was a problem.
jimmy milnes
Well-Known Member
jimmy milnes
Well-Known Member
Update.....
As you see from the attached photos, the seater stem isn't pushing on the same place as the comparator measures.
As you see from the attached photos, the seater stem isn't pushing on the same place as the comparator measures.
Why would it? And why should it make a difference if you‘re measuring equipment and ogives are consistent
The ogive isn't an exact point on the bullet , its the curved area between the bearing surface of the bullet and meplat (tip) .,
Mountainstalker is suggesting that the polymer tip is perhaps making contact inside the seating stem before actually making firm contact with the ogive , causing variations in seating as the tip deforms . As this is a new problem , I would still suspect neck tension .
My suggestion would be , measure a load of bullets (to ogive) and group them . When you've 6 the same , remeasure them , to ensure its not your technique , which I'm not doubting . Ensure you've properly chamfered the case mouths , then seat that group and measure . Now inspect them closely for any marks or damage to the bullet or polymer tip . Pobably easiest to do by photographing and expanding the picture .
If after this the variations using the matched group are still present , I would be fairly confident in saying its time to anneal . If you're not confident and don't want to commit a full batch of cases to annealing , why not ask on the forum if an SD member would do half a dozen for you ? Otherwise, you're going to be chasing your tail in endless circles .
Good luck ,
FT
Mountainstalker is suggesting that the polymer tip is perhaps making contact inside the seating stem before actually making firm contact with the ogive , causing variations in seating as the tip deforms . As this is a new problem , I would still suspect neck tension .
My suggestion would be , measure a load of bullets (to ogive) and group them . When you've 6 the same , remeasure them , to ensure its not your technique , which I'm not doubting . Ensure you've properly chamfered the case mouths , then seat that group and measure . Now inspect them closely for any marks or damage to the bullet or polymer tip . Pobably easiest to do by photographing and expanding the picture .
If after this the variations using the matched group are still present , I would be fairly confident in saying its time to anneal . If you're not confident and don't want to commit a full batch of cases to annealing , why not ask on the forum if an SD member would do half a dozen for you ? Otherwise, you're going to be chasing your tail in endless circles .
Good luck ,
FT
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