Post by Richard on Feb 3, 2016 15:27:42 GMT -5
Tuesday morning started out real foggy at 49* but cleared by the time I moved to 300 yards. Very little wind to speak of?; Could see a little movement in the tops of the pine trees but probably not at ground level.
Hope my posting this stuff in story form is OK? To just put on the targets and the fact sheet does not tell the whole story many times.
To foul the clean barrel I used some 300 gr. Sierra Flat nose bullet thru starting with a 10/60 ---N-110/H-4198 duplex using my standard Win. 209 primer. First shot?..............Did not fire! Primer ignited but did not light up the powder. Probable cause being the clean barrel, relatively loose fit of the bullet and the N-110 booster. So, I re-seated the NOW mixed up duplex and put on a CCI mag. primer. While it did ignite, the velocity was 200 fps slower than the succeeding shots. I did not count it in the velocity or the group. Note: that first shot with the mag. primer did NOT stick on the bolt nose however shot #4 where I substituted another mag primer, it did stick. These CI mag. primers leak gas up 50% of the side…………the other side is clean as a whistle?
I am hoping when I get the .035” bushing from Hank that this situation “might” go away?
So, all in all, the group was just ….ok. Here again, its only a big ole pistol bullet!
Av. vel. 2702 with 32 fps ES.
Sticking with the same bullet I put my old tried and true (for the most part) 10/60—Clays/H-4198 duplex under five more shots. Here the velocity came in at 2683 fps with an 11 fps ES. Shots 1, 2 and 3 grouped in .8” with the best four in 1.1” and all five in 2.3.” Overall, nothing spectacular but more than sufficient for deer hunting at reasonable distances.
Moving right along with my altered 300 gr. SST (hollow base at 275 gr.), no wad, very loose fit and the same 10/60 duplex as above, my average velocity was 2775 fps but ES was 47 fps? However shots 1 thru 4 came in at 2782 with only a 17 fps ES. Dissecting the group, shots 3, 4 and 5 printed a nice .484” but when you look at the velocity of the three shots, it contains both the highest and the lowest speeds. I believe the fact here is that at these speeds, the bullet is still shooting flat enough that the velocity difference does not matter. What probably matters is the integrity of the bullet itself. Here again, just a generic bullet that I altered on the lathe.
Next up was the 300 gr. FTX with a wad and the same 10/60 duplex as above. Velocity average was 2723 fps with a somewhat high 40 fps ES………..would have thought this would be lower?
With the fog having lifted I cranked up the scope and put a shot on the steel gong with a 300 gr. SST and 72 gr. of IMR-4198 to condition the barrel for a group with the 300 BE.
Well, here we go again with the single powder load (72 gr. I-4198) and a large ES. The velocity averaged 2770 and the ES was 68. for four shots. (300 BE). Shots 2, 3 and 4 went 2..4” while all four went 3..5”. Not altogether bad but was shot #1 still needed to completely condition the barrel for the single powder load???
Since I did not have enough of these 300 gr. BE’s for another group, I went with some 250 gr. BE’s that I had. This time I kicked them with a 7/65---4759/H-4198 duplex (no conditioner shots). The velocity averaged 2940 fps (3-shots) with a 19 fps ES and a 4.2”group. Not horrible but not where Richard wants to be! (a wad was used)
So here is the icing on the cake! 250 BE, with wad and the 10/60—Clays/H-4198 duplex the velocity averaged 2912 fps with a somewhat large ES at 44 fps but the group measured .901” Not sure why the ES was as big as it was but still way better than any of the single powder loads.
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