I was bored and had a reamer from years ago so I built one this weekend. I barely got to shoot it before dark last night to get it on paper at 25yds. I loaded 60 to 64grs of H5010 in 1 grain increments and then loaded 5 at 65 and 5 at 66grs. The first shot was 60grs and it was pretty mild so I jumped right to 65grs. Then I shot a 3 shot group at 25yds with 65grs just because I could barely see the target at 25yds and I knew it would be pointless to try 100yds. It shot in the .1's which was no small feat since I could barely tell where the crosshairs were. It was too dark to get a reading from the chronograph also. Hopefully I'll get another chance tomorrow to see what this load is doing. Any help on loading data would be helpful.
I did shoot it this morning Scotty. I shot a 3 shot group with 65grs of H5010 and it was about 5/8" and 3275fps. Then I did a latter test with 60-66grs of Retumbo. 60-63grs (4 shots) went into just over 1/2" and 61-63grs went into 3/8". The velocity was 3274 to 3378 for the 4 shots. 64grs jumped 100fps to 3476 and went an inch or so higher. 65grs went 3482 and 66grs went 3580. So 64grs is probably the max I'd want to shoot but I would lean towards 63grs just for the sake of accuracy. The dilemma is weather or not it is worth keeping. I have 2 .243AI's. One is a rechambered facotry barrel that will shoot 5 shots under 1/2" and the other is a 30" Bartlein that shoots 5 in 1/4". The Bartlein will shoot 105's at 3300fps with 10-15grs less powder. So if I shot where I think the accuracy will be (63grs) the velocity is only around 75fps faster than my .243AI.