2" high first shot normal?


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sansone
January 5, 2011, 12:51 PM
I did a search here so please forgive a tired subject. At 100yds that first clean-bore shot is expected to be a little high. But 2" above the following shots seems a little extreme. This is with a new brrl so maybe the bore needs more break-in shots fired through it.

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230therapy
January 5, 2011, 01:03 PM
There are guys that are going to swear up and down that you need to do an involved procedure for barrel break-in. Other guys will say it's not required. All I know is that I did the minimum and the gun still hit the target at 1,000 yards. I'm not sure I could detect a difference in performance between the two procedures. Perhaps a serious competitor would notice...I'm not that good, so I don't care.

I just shot the gun until the groups started opening up. This occurred around the 25 round mark. I used copper solvent once and cleaned it thoroughly. After that, the first shot was 1" high and 1" left at 100 yards.

sansone
January 5, 2011, 01:08 PM
ok so you were getting first clean-bore shot one inch high. That is what I expected. I will continue shooting and hopefully things will improve. I am lightly cleaning the bore every 5 shots only because it is new

230therapy
January 5, 2011, 01:09 PM
That also could just be what your gun does. Keep a log and you'll just have to account for it like everyone else. How many rounds have you put through the gun so far?

R.W.Dale
January 5, 2011, 01:17 PM
I am lightly cleaning the bore every 5 shots only because it is new

This is probably why.

Every rifle is different but I've seen on several occasions when chronographing loads that the first shot from a clean oiled bore can be as much as 150 fps+ SLOWER than the subsequent shots

jerkface11
January 5, 2011, 01:18 PM
I haven't had a rifle yet that shot right when it was clean.

sansone
January 5, 2011, 01:23 PM
so far a box of ammo. Using a dry boresnake so not shooting through oily barrel. Three outings of 7 shots per. Just noticed a trend for higher than expected first shots. I am keeping a log and going again today if rain stops

praharin
January 5, 2011, 01:34 PM
21 rounds is not enough to know any trends in your rifle, IMO

sansone
January 5, 2011, 01:36 PM
I will fire more rds and look for improvement. I just never saw so much difference in first shot impact before

Float Pilot
January 5, 2011, 06:34 PM
Not enough info.

What type of rifle and how thick is the barrel?
Is it free floated or glass bedded?
How long between shots?
Are you pushing a dry patch through the bore before shooting?
How dirty is it during your cleaning sessions?

Cold, fouled (oil in barrel) shots are usually someplace else.

jpwilly
January 5, 2011, 07:11 PM
Seems to indicate a lot of lube / oil in the bore. The added velocity puts the shot high. Put a clean dry patch through the bore before shooting.

jcwit
January 5, 2011, 07:54 PM
Every rifle I own from center fire to rimfire to black powder, requires at least 1 minum fouling shot.

sansone
January 6, 2011, 08:39 AM
thanks for the input, I'll fire another box today. I'm going to push some dry patches through before firing to remove any oil. I will need to decide whether to sight-in for the first shot or follow-up shots. I lean towards the follow-ups. I started this thread because 2" off the group seems excessive

praharin
January 6, 2011, 02:07 PM
2" might be excessive compared to the rest of the group, but it's really not that bad.

I would sight in for the majority of the group, and remember that the first shot will be 2" high. However, my thoughts are regarding a hunting/field rifle because that's how my brain works. If it's a precision rifle, that you will be adjusting the sights/optics between shots anyway, zero should be at cold bore and clean barrel and then develop a data book so you can adjust accordingly between shots.

Txhillbilly
January 6, 2011, 09:53 PM
Most clean cold bore shots will be a little off,from a dirty bore shot.

But my bull barreled 308 Savage shoots almost the same hole,no matter what the bore condition is.
All my other rifles do vary,and I log what each bullet type,weight,and mfg. shoots with a cold bore,and clean cold bore.

adobewalls
January 6, 2011, 10:37 PM
You may be able to minimize the deviation of that first cold bore shot or you may not - every rifle is different. One method to try is to run an alcohol patch down the bore to clean out any oils and then a couple of dry patches to insure the bore is dry.

But keep in mind that some rifles like to be fouled a bit before being consistent.

I had a rifle that I made sure to shoot two or three times at the start of the season and then I did not clean it until the season was over; just so I could be confident of where the POI would be if I got a shot.

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