First bullet

jingzy

Well-Known Member
Rifle in question has had 20+ shots through it since cleaning, throws its first then groups well. Let cool, throws one, then groups!!
 
D

Davie

Guest
That would be a bummer as it is that first bullet that is the boy you want in the grove. How bad is the throw can it be put up with or is it way out.
 
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Davie

Guest
jINGZY I COULD LIVE WITH THAT IF I GET A 2 INCH GROUP AT 160 I AM REALLY QUITE HAPPY BUT DONT TELL THE TARGET LADS. :lol:
 

jingzy

Well-Known Member
Yeah,
its not bad, the rest of the group are all touching bullets. So it is perfection that I am looking for.

Cheers,
J
 

Heym SR20

Well-Known Member
Jingzy - I think you have nswered your question yourself - many rifles with particularly lightweight or sporter weight barrels will shoot slightly differently as the barel heats up. Probably a function of metal expanding and a barrel is never perfectly concentric.

If you really want to see how your rifle groups - shoot one round, open bolt, leave for ten minutes, shoot another, and do the same again. Barrel is thus cool for each shot. For each shot tough make sure the rifle is held and supported in the same manner.

Thats how I would sight any stalking rifle, and I would always take some final sighting shots using field positions as this will change (usually sightly) the point of impact.

In the field, what matters is your first shot, which will be taken from a cold barrel.

And you mentioned your rifle is shooting a 2 inch group at 160 yards. More than enough accuracy for any UK deer species taken at reasonable ranges.
 

1shot1kill

Well-Known Member
yip what you are experiencing is a "cold zero" the one where the bullet travels down the barrel when it is still cold, for a stalker, this is the important one, as you only fire that one shot, usually.
do as was suggested, let barrel cool down between shots,and use your cold zero as your true one, not the poi through multiple shots, it should just be a difference in elevation and not deflection.
Make a note of it and adjust when on the range.
 

stag1933

Well-Known Member
I had a new .308 Sako Mod. 75 Varminter that threw a nine at half-past seven on the target always when cold then in the bull thereafter.
Riflesmith Trevor Procter diagnosed a barrel fault and I took it back to the dealer from whom I bought it. After much hassle GMK sent it back to Finland and the barrel was replaced.
I had much time loss and aggravation but the rifle is a one-holer from cold now so all has ended well.

HWH.
 

1shot1kill

Well-Known Member
its amazing the woble on a "top end rifle" barrel , mannlicher are amongst the worse if you put it on a lathe. Doesnt mean it wont group though, it just wont shoot straight.
 
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