H380 temp sensitive

[simon6ppc]

hi guys i hope you don' think this is a silly question but is H380 temp sensitive to the cold as well as heat as i was shooting the other day in almost freezing condition's and i was getting slightly more pressure signs for some reason...cheers simon

 

[CanusLatransSnpr]

I can't believe the freezing temps would cause a pressure spike?? I've shot H380 and H414 in the freezing temps and if anything they had less bang than warmer temps! The only explanation I can think of would be the bore diameter of the barrel constricted ever so slightly due to the freezing temps??? Just a stab at an explanation!

Mike

 

[simon6ppc]

ye cheers mike,ime using 40 grains of H380 with a 50 grain blitzking,ive only ever used around 37 grains for the last 20 years in my 22.250,s but this remy VSSF2 i shoot now, only shoots good if i send them fast.it was safe the other day but could tell it was starting to show signs,

 

[CanusLatransSnpr]

40 grains is middle of the road, according to Hodgdon with a 50 gr. bullet! What is your cleaning regimen like? I'm thinking there may be other things factoring into this, perhaps the dreaded carbon ring just in front of the throat??

 

[simon6ppc]

ye pal,the primers are slightly cratering and the bolt lift once or twice was slightly stiff,i thought the same as you but don't know what to think to be honest.

 

[simon6ppc]

also forgot to say i clean my barrel every time i shoot it,ime very very fussy when it comes to cleaning barrels

 

[CanusLatransSnpr]

Well Simon, I don't know what to tell ya? You have me scratching my head and my ass at the same time lol!

 

[smoooth]

Could it be possible that the cold caused some condensationto develop in the chamber or bore? Had that happen on a very, very hot day with some rounds I was trying to keep cool. Maybe the reverse happened?

Cold temps cause less pressure, that is a fact. If you changed primers, that could certainly do it, though.

Any chance you use a bore guide with an O-ring? Maybe it stayed in the chamber?

 

[bheadboy]

Simon, I just looked at the Hod page and h380 with a 50 gr Sierra shows a max of 41 gr H380-- and the unusual thing is the CUP in in 45000 level, light for the modern cases

I think you have something else going on, possibly seating depth, are you touching? this can cause a change in max load. are you bumping the cases or over sizing them setting the shoulder back?

Bob

 

[triggerhappy243]

Is it a new batch of powder?? I have been using h-380 for 35 years and I redo load workup on new batches of powder... shooting across the chrono as well.

 

[simon6ppc]

it is a new batch of powder and i have put some large match primers in for a change, also when you say over sizing how can you tell you have done that,cheers simon

 

[bheadboy]

on the question of how to tell if you oversize? Hornady has a gauge that enables you to take the proper measurements and hold the shoulder push back to a max of .003" for pd loads.(Product #: 479704 ) at Midway, use directions in package, start with fired case measure, then adjust dies slowly to reach desired point.

as to primers and new powder, H380 is great and unless your older batch was years/years old the new will be very close and should not cause this problem.

Bob

 

[LCazador]

In agreement with all the posts, that cold will reduce pressure not increase it. And while it is very important that you know how much you are pushing that shoulder back, I don't think that's it either. Check your case length and check your COL to make sure you're not too far into the lands. It is very possible that the lot of H380, may be hot, but it should still be within the pressure parameters of loading manual listings. Also revisit your cleaning regimen. Remington barrels are pretty rough and require extra cleaning. I have a bore scope and you won't see that carbon ring without one. I start with two patches of Sweets, letting that soak for a few minutes, then I make two passes with bronze core brush soaked with Bore Shine for each shot that I took. I then spin a larger brush soaked with Bore Shine or Iosso to clean the carbon ring, about twenty turns. This brush should about the same diameter as your loaded diameter but doesn't have to be exact. So for your 22/250 you should be spinning a 243 or 6mm brush to properly clean that carbon ring. A 22 brush won't touch it.

 

[simon6ppc]

thanks for that guys,in all fairness when i use 36.5 grains of H380 with a 50 grain bullet i cant get away with just neck sizing,i have to full length the brass other wise its tight to chamber in and out again,and thats with a soft point seated at 2.350 which in all fairness shoots half inch at 100 yards,the reason i changed from it was it was penciling through foxes when shot and thats when i went to ballistic tips and wasn't happy with the accuracy.as said its a love and hate relation ship i have with this remy.lol

 

[CatShooter]

"... when i use 36.5 grains of H380 with a 50 grain bullet i cant get away with just neck sizing,i have to full length the brass other wise its tight to chamber in and out again, and that's with a soft point seated at 2.350... "

If you are having extraction problems with 36..5 of H-380 and 50gr bullets, you have other problems - that load is developing very low pressures - look elsewhere for the problem.