1st load

tolley

Well-Known Member
#1
just done my first loads,im getting a lot of powder marks on the neck and soot like on the case,is this low pressure.
whats the next step.
 

rabbit fingers

Well-Known Member
#2
Can you give a bit more info please ie. calibre, powder/quantity, bullet weight/type, is the "soot" just on the neck or on the shoulder too. Thanks :)
 

tolley

Well-Known Member
#3
sorry should have put more info. :oops:

nosler 120BT
lapua case
44gn rl19
cci primer

im testing how far off the lands ,so started at 10t,30,20 .grouping wise the 20t was far better ,must say it surpised me how good compared to factory load. :eek:

on the 30t there was soot all the way down the case and a bit on the others.

mike
 

rabbit fingers

Well-Known Member
#4
You don't say what calibre. 6.5 55 maybe? have you tried other powder weights, is 44gr the start load with rl19 if so it may well be that the pressure is low and the case is not expanding to fit the chamber allowing propellant gas back between the case and the chamber wall. I have experienced soot on the case necks before but not as far down the case as you describe. Perhaps someone with more experience will be able to shed some more light on the problem. :)
 

rabbit fingers

Well-Known Member
#6
I don't want to teach anyone to suck eggs but IF it were me I'd make up 4 or 5 at 44.5 gr the same at 45gr and so on up to near max load,all the same OAL, wait for a calm day and try them in order, checking for high pressure signs as you go. Use a different target for each group and it should become clear what weight powder gives the tightest group. I do my testing at a minimum of 200yds as it is easier to see the differences between groups. Hope this helps. Let us know how you get on. :)
 

tolley

Well-Known Member
#7
so far i've got to 46g and its grouping just right :eek: with each hole over lapping. :D .and 20t off the lands .that was all using the fired cases.

do you think it will make much difference on the new, not fired cases.
 

rabbit fingers

Well-Known Member
#8
Sounds like 46gr is the load then. :) Have you still got the soot problem? Are you full length or neck sizing? if just the necks you may get better groups from the fired cases.If looking for best accuracy I try to keep my cases at the same number of firings EG you have 2 cases together 1 having been fired once and another fired 5 times the neck tension will be different due to the brass around the neck being harder from working on the 5 times fired case. (I hope that makes sense) :)
 

tolley

Well-Known Member
#9
the fired cases im neck sizing , the new full.as for soot im still getting a little bit .
i must say it was a good feeling see that sort of group :D was being to think this was not for me.
just made up another 10. :)
 

Richard Parsons

Well-Known Member
#10
Sooty necks are normal, soot past the shoulder (obturation) is not. Are the primers flattened out, was recoil excessive compared to factory rounds? Make sure you chamber clean rounds, anything with lube/oil on will batter you and the rifle.
 

tolley

Well-Known Member
#11
just tryed some of the loads, :cry: once fired not to bad a little bit of soot but not very good group.the new brass soot all over the place it look't like round marks and a very thin ring around the brass :eek: ,stop soon as i found this.
primers look ok, there did seem to more recoil ,tried a factory round ,no ring around the brass.

not sure what to do now :(
 

scotspine

Well-Known Member
#12
tolley

What is the overall length of the rounds?
How easy is it to seat the bullets?
Do you have access to a chronograph? An accurate reading of velocity will help you considerably
 

scotspine

Well-Known Member
#14
tolley

Try seating bullets deeper.An overall length of say 3.000inch

Make sure you apply plenty of force when neck sizing.

Could ring be caused by the de-burring tool?

44g of reloader 19 is the low end of the scale but shouldent result in anything other than lower velocities.
 

tolley

Well-Known Member
#15
6.5

thanks all
will give it a try ,not sure whats happened had some good groups with the 46g,i have a difference of 0.009 in some of the cases ,would that make a difference.

which trimmer is best.
 

tolley

Well-Known Member
#16
OAL using a comparator is 2.616

1st load 37 off lands 46.5g very sooty very good group.

2nd 41 off lands 46.5 not much soot good not as good.

3rd 37 off lands 46 no soot group ok

4th 16 off lands 47g V V sooty good group.

:???: :???:
 

buck52

Well-Known Member
#17

scotspine

Well-Known Member
#18
Hi Tolley

I've just put together a dummy round using a 120g nosler bt. At 3.128 inch oal there is only 0.25 inch of bullet in the case.The bullet has a boat tail so there ain't much left to seal the neck.
Also the Lee Collet Die info sheet reccommends an oal of around3.000 inch.
Give a shorter round a whirl...I don't think accuracy will suffer.
 

ReneZ

Well-Known Member
#19
If you are going to seat the bullets deeper make sure you back of on the powder charge a bit. Deeper seating - smaller cartridge volume - higher pressures. Cheers, Rene.
 

tolley

Well-Known Member
#20
many thanks ,will give it a go.

do'nt laugh :oops: the mark on the case is the chamfer tool ,just did a new case :oops: :oops: well, one less problem to sort out.

Yes i know im a dick
 

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