What would cause this? Pattern Pics

[gophert]

Gun: Rem 870 SM  26" bbl  with JellyHead .660
Ammo:  Hevi 13 3.5" 2.25 oz #7

Last year I shot this exact setup in 78 degree weather and got 308 in the 10" at 40 (see pic)

Yesterday I shot the same setup and got 171 at 40, but at 30 yards I got 403.  What would cause the difference.  The barrel was clean, but not polished.  I wiped it between shots. 

What are your thoughts?

Last Year 40


Yesterday at 40


Yesterday at 30

[chipper]

scrub the choke with hoppes #9 and a bronze brush then deep clean the gun. I was getting crazy patterns a couple weeks ago and did this and it straitened my patterns out.

[GOLD HUNTER]

get you a ic.665 for that gun 

[longspur]

my first shot after cleaning don't pattern well. I don't even use a high dollar shell anymore I fire a cheap load through it first.

[gophert]

That 40 yard shot yesterday was the first shot after cleaning.  The 30 yard pattern which I thought was really good was next.  Perhaps I should try shooting after I have fired once.  THANKS!

[BOFF]

That 40 yard shot yesterday was the first shot after cleaning.  The 30 yard pattern which I thought was really good was next.  Perhaps I should try shooting after I have fired once.  THANKS!

...........................................................  .................................................................... ...........................................^^^^^^^^^THIS



God Bless,
David B.

[hookedspur]

get you a ic.665 for that gun 

[Ctomp1974]

my first shot after cleaning don't pattern well. I don't even use a high dollar shell anymore I fire a cheap load through it first.

X2...not sure why they hate gun oil so much.

[TheSportsman]

PLUS make sure your fore end cap is as tight as possible... That has a lot to do with my 870s performance.

[Gobble!]

get you a ic.665 for that gun 

Why? That makes no sense. Last year he got 308 with that load. My best with my Indian Creek is 324.