Couple of reloading questions please.

Eyefor

Well-Known Member
I recently batch weighed 500 x 100gr Sierra's in 7mm-08 and found them to range to be between 100.3gr and 99.8gr with the split (roughly) 3% 100.3gr, 5% 100.2gr, 15% 100.1gr 65% 100.0gr, 10% 99.9gr and 3% 99.8gr (I know that's 101% - but close enough).

Normally I would load all the 100.3, then the 100.2 and so on which (with all other factors being equal) would give me a slight increase in the POI as I shoot the lighter bullets?

Q1. Is this correct thing to do - or do I load all the 100.00gr until they are finished?

Q2. Roughly (with 45gr Varget) what would be the expected difference in POI over the 0.5gr variation at 100 & 200 yards please? I'm guessing not a great deal - so not worth bothering about with a hunting load (too many other possible variances?).

Just (Friday pm) bored & wondering.

Thanks.
 
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Claret_Dabbler

Well-Known Member
You need to get out more.....

I never weigh bullets, life is too short. I just load them as they come out of the box.
 

j0e_bl0ggs

Well-Known Member
I recently batch weighed 500 x 100gr Sierra's in 7mm-08 and found them to range to be between 100.3gr and 99.8gr with the split (roughly) 3% 100.3gr, 5% 100.2gr, 15% 100.1gr 65% 100.0gr, 10% 99.9gr and 3% 99.8gr (I know that's 101% - but close enough).

Normally I would load all the 100.3, then the 100.2 and so on which (with all other factors being equal) would give me a slight increase in the POI as I shoot the lighter bullets?

Q1. Is this correct thing to do - or do I load all the 100.00gr until they are finished?

Q2. Roughly (with 45gr Varget) what would be the expected difference in POI over the 0.5gr variation at 100 & 200 yards please? I'm guessing not a great deal - so not worth bothering about with a hunting load (too many other possible variances?).

Just (Friday pm) bored & wondering.

Thanks.
Would be interesting to run that particular 7-08 load through Quickload and see how the barrel timing changes.
 

Eyefor

Well-Known Member
You need to get out more.....

I never weigh bullets, life is too short. I just load them as they come out of the box.
Would be interesting to run that particular 7-08 load through Quickload and see how the barrel timing changes.
Perhaps we should go out (more often) together dear :gheyfight:

I think it would be interesting too - I just like to eliminate other factors in order to know it's my fault when I miss. Sad, but good fun.
 

j0e_bl0ggs

Well-Known Member
Perhaps we should go out (more often) together dear :gheyfight:

I think it would be interesting too - I just like to eliminate other factors in order to know it's my fault when I miss. Sad, but good fun.
Iain, if you PM me your 'data' I'll run it through QL for you...
 

swarovski

Well-Known Member
isnt gonnabe much difference at 200yds if any,if you can put every shoot in the same whole you mite see change between batches,probaly best to get out more :rolleyes:
 

matt_hooks

Well-Known Member
I reckon that difference in POI for your group probably represents the difference a 0.5% difference in bullet weight will make at 200 yards.
 

Muir

Well-Known Member
There's some time from your life you'll never get back! Don't waste your time weighing bullets. ~Muir
 

leec6.5

Well-Known Member
i had a very simlar situation with some sierra gamekings 130gn spbt's , the last batch of 50 rounds i loaded were between 8-10 tho longer once seated .

the die had not been touched and i double checked it against the dummy round and seated another 20 rounds and the OAL was again 8-10 tho longer so i put it down to the lead soft point being slightly longer than the last batch i got so i just carried on and finished loading !

i can see they will shoot bugger all different than the sub inch groups i usually get from that load so , if i were you load them and shoot them !
 

Brithunter

Well-Known Member
i had a very simlar situation with some sierra gamekings 130gn spbt's , the last batch of 50 rounds i loaded were between 8-10 tho longer once seated .

the die had not been touched and i double checked it against the dummy round and seated another 20 rounds and the OAL was again 8-10 tho longer so i put it down to the lead soft point being slightly longer than the last batch i got so i just carried on and finished loading !

i can see they will shoot bugger all different than the sub inch groups i usually get from that load so , if i were you load them and shoot them !

Hmmmm most dies seat on the ogive and not the lead tip so chances are the new bullets came from a new die as after all bullet forging/swaging dies do wear and have to be replaced sometimes.
 

leec6.5

Well-Known Member
Hmmmm most dies seat on the ogive and not the lead tip so chances are the new bullets came from a new die as after all bullet forging/swaging dies do wear and have to be replaced sometimes.
your quite right there brit ,

but i did test them this afternoon and managed a 3/4" 5 shot group instead of the usual cloverleaf , but thats plenty accurate for me !
 

Eyefor

Well-Known Member
OK.

So I took the advice and got out some more.

Below is the result at 300 yards yesterday (bit blowy) with the 7mm-08 and the 5 different bullet weights 98.8 / 98.9 / 100.0 / 100.1 / 100.2 which I shot on the basis that 99.9% of what I shoot is well within that distance so this represents the maximum spread?

The rifle is 1" high at 100.

Might be a bit OTT - but now I know?

View attachment 10684
 

geordieh

Well-Known Member
OK.

So I took the advice and got out some more.

Below is the result at 300 yards yesterday (bit blowy) with the 7mm-08 and the 5 different bullet weights 98.8 / 98.9 / 100.0 / 100.1 / 100.2 which I shot on the basis that 99.9% of what I shoot is well within that distance so this represents the maximum spread?

The rifle is 1" high at 100.

Might be a bit OTT - but now I know?

View attachment 10684
Which bullet hole was which bullet weight
Geordie
 

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