I just went through a temperature sensitivity problem
with H-380, in my .22-250 Rem. I was working loads up,
this last Spring, starting at 38.0 grains, and working towards
40.0 grains. Last spring I shot all of the groups, except some
of the 40.0 grain groups. The couple of 40.0 grain groups
I shot last Spring had no signs of pressure. Accuracy was
tailing off, so I thought I would just shoot a few, and check
if to see that they were opening up, and I was just not
having a bad day last Spring. In the first group I fired, I had
one sticky bolt lift, and the primers looked a little flat. One
the second group, all bolt lifts were sticky, and the last shot
was downright stiff. 40.0 grains is 1 grain below the published Max./ubbthreads/images/graemlins/shocked.gif
So I pulled the last two groups worth of bullets, and
have decided to switch to a different powder for load
development. I have some new loads, with Varget, ready
to test. This is a darn shame, since the rifle was shooting
3's with 38.5 gr. of H-380, pushing a 50 gr. VMax bullet.
Varget didn't show me much with the 55 gr. Nosler
Ballistic tips, so hopefully Varget plays better with
50 gr. VMax bullets, in this rifle.
Squeeze