PHOENIX PHIL
AH ambassador
Honestly, I have not fired it rapidly enough to heat the barrel.
I had it out last weekend and with it being warm as it is, I was only firing one shot every 3-4 minutes.
It seems like the No 1 can be very sensitive to barrel harmonics. I have only owned 5 now, and have not noticed them to be particularly fussy (my other 4 were 2@ 375 H&H, 2@ 45-70 and 1 .458...300 H&H is the only smallbore).
Maybe a Hick's Accurizer might help your rifle to settle down? Seems like many folks have had good luck getting more reliable accuracy from otherwise troublesome rifles?
Once I settle in on a load that I know shoots well, I will do some groups of 3 shots in 30 seconds to see if the group opens or walks inordinately.
I'm going to wait until it cools off a bit before starting up again. Last load I shot was 165gr North Forks using IMR4350. Got a good group one weekend, the next I had one going again and got a flier on last shot. But things were warming up the second weekend and IMR4350 from what I can tell starts to go squirrely when the temp hits 90 to 95.