Dirty n133

[hughes.s]

Just been out trying some loads 2 x 5 n120, 5 x 5 with n133, the n120 burns clean as a whistle,

very little soot on the necks (19.6g 55g spsx) (19.6 55g blitzking)

55g spsx on top of 20.6 n133 looks ok too, groups are good, sub moa @100yds, will chase these, no signs of overload.

Clean necks inside and out,

 

It"s the lighter made up rounds

23.0/23.4 n133 50g blitzking 5 of each,

23.0/23.4 n133 52g amax 5 off each,

 

these show signs of the case neck not expanding enough (really dirty sooty necks, (inside as well) and poor groups) so a tad more powder needed ?, primers show no problems.

 

Brand new Winchester brass fls to fit my chamber (-.003 to shoulder). neck crimped, all ogives -.020 short of lands

 

Whats bugging me is n133 a dirty powder, is it because there is not enough powder for a efficient burn?.

 

Did a barrell clean after 20 rounds really dirty crown, filthy patches.

 

 

 

 

[gunner]

is this a 222rem your shooting ? i used N133 in 223 rem but my load was between 22.6 - 23-tops ! the former in hot summer ! - but assuming your using 222 ? if its 223 , your load seems a little low ? iv read posts that some people have used 24 grains of n133 !

 

for the lighter loads , if your not getting any pressure signs then up it slightly ! and see what happens ! i remember 133 being clean burning ! but i have had sotty cases with N135 ! atb tim..

[gun nut]

You assume right Hughes.s, the dirty loads aren't generating enough pressure to expand the case to fill the chamber, low pressure is probably responsible for the dirty burn too.

 

 

Mike

[hughes.s]

Thanks to both,

 

 

 

Hughes.s