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I will definitely run up some of the H4350 with the 120's. I wonder how different it will be from the 43.5gr of IMR4350. I was always a little wierded out by those numbers once I learned many years ago that they were different but the same. My Sierra book only goes down to that 43.5gr of the IMR. I know when I drop from 59gr of IMR4831 to 57gr in my .280 it makes a noticeable difference in the recoil. I also noticed that once I hit 59.5 gr of IMR4831 the groups will start to flare. I like my 56.5gr with Hornady 139grBTSP. Easy to shoot from the bench and nothing runs away.
Looks I should just go get a Hodgdon Manual to go with my collection. Thing is with such a short barrel it doesn't pay to run the loads very hot. Once I can find out the Rate of twist I can look for more bullets. My seven shoots both the 120 and 140's well, but when I get up into the 47gr that little turd starts to bite pretty hard at the bench. I have a quirk where I manage to beat myself pretty hard trying to make sure the gun is doing it's part and then in the field it's up to me. I always did the same thing for my kids. Made sure the gun grouped well and then it was up to them to dial it in. My daughter and I always shot exactly the same POI until my eyes started to get old, but we are still close. My youngest boy is a lefty his POI is always 4 up and 6 left of mine even to this day 22 years after he started hunting. I hope I can get that many years in with the grandsons. One is 9 and one is 3. The 9 yo has been hunting with us since he was 5 like my kids did. I might try and get the youngest out for a few minutes next year into the swamp ground blind. Easy walk, if it's froze, lots of red squirrels and birds and better yet a heater.
I like 120 TTSX out of this cartridge but it needs velocity to expand. For light recoil, I would stick with 120 BT and a light charge.
May have to give this one a try, MV?
What are you shooting with the partions? I used 140's in my .280 and quit because on broadside shots through the ribs they didn't expand hardly at all. On frontal shots under a 100yds they would literally end for end.
Unfortunately, I've never chronoed this load. However, it was very accurate in my Tikka T3x. According to Gordon's, in an 18" barrel it should be around 2,791, and in a 22" barrel it looks like 2,942. The pressure is under 55k psi as well. Varget shows very good calibration on the Gordon's tool FWIW.
