i am new to this website and joind about a month ago to get somne info and holy smokes i just got done reading all the info about the 260 here. Coincidentally, i just got in my new barrel (krieger 24", 1-8 #10 fluted) and it is a smokin setup with a MK4 8.5x25 w/M1 knobs and 20MOA EGW.
With that said i shot it this weekend and between break in rounds (20) and cleaning and then on to 50 test loads i found some interesting info which comfirms alot of what has been said on here (go figure
Anyway the loads i tested were 123 Scenars with H4350, CCI200, 2.800, and pwder from 43.2-44.0. It seems the rifle likes the 44.0 as a high node and 43.2 as a low node. I am gonna play witht he high and low nodes and go a few grains above and below each just to retest what i shot.
the other load i shot was 140 AMX, CCI200, H4350, 2.800 and 42.1-41.7. 41.8 seemed to do the best and again i a going to do a retest just to see what i can do with a broken in barrel and also get on a better bench. the one i was on wasn't as stable as i would prefer but it still shot great.
the ES for the first load was 18.43 and the second was 9.94 all fps with hand loads. i am using a 5-0-5 RCBS scale which is accurate but my buddy is having better results with the chargemaster set. gonna pick one up. Both loads also used win 7mm-08 brass necked up. I also found that the cases need to be trimmed a bit here and there due to just a tight chamber. some cases were sticky and once fired they smoothed out but overall the win brass performed very well. no pressure signs at all.
attached are some picks of the gun and targets, still working n loads and the shooter needs to get better. i adjusted the trigger and i think i am about 1.5# on a factory rem trigger and the action is a rem 700 SA.
The pick of target 1 is my break in loads 140AMAX, 2.785, RL19, CCI200 win 7mm-08 case necked up and 44.0 grns. the five shot circled lower left is 5 shots w/cleaning after each shot. middle center is 3 shots consecutive then cleaning, and the last two in the orange dot are my last two then cleaning. top left is 5 shots then cleaning and then another 5 shots and cleaning.
top right is my best group with 44.0 grn H4350 w/123s scenars with H4350 from 44.0,43.8,43.6, 43.4 and 43.2 .moved to the center, lower left, lower right and botttom right. i was shooting from a folding plastic table and a bench rest so i moved a bit. we are working on putting a solid table permanatly in at the range so movement is minimzed but for what i was doing it worked just fine.
if anybody has some more info that might help info is always welcome. thanks