Okay guys. This is a duplicate post that I had on another forum board and I haven't any answers there so, here it is.
I'm going to presume it's a load issue with 2 different rifles. Here it goes...
I went out at 200 yards to test some loads and see what would happen with seating depth changes. The first picture was shot "round robin". I would shoot one round that was 0.005" off the lands and then progress until I had shot all 4 loads ending at 0.020". I adheared to a 2 minute shot interval. The next round was shot from right to left etc...
Between the 5 total shot stings, I would shoot groups with the 260 (which we'll get in to next). Here's the results with the first rifle.
The issue I have is the horizontal stringing in the first group shown which is 0.005" off the lands. Vertical C-C is less than 0.45" Horizontal is 1.3". All the other groups look "similar" although terrible.
My 260 has 2 group that show similar results on groups #5 & 6. The groups were shot left to right, 5 shots at a time with ~10 seconds between shots. I varied charge weight and OAL on these groups but when the vertical went away, the horizontal gets excessive.
Vertical on #6 (C-C) is ~0.16", Horizontal (C-C) ~1.6".
Since the groups in the first pic were shot round robin, and the groups in the 2nd pic were shot in "groups", I know that wind is not the issue. Anybody care to tell me what's going on here and where I need to go for correction?
The first rifle is a single shot and there is much more time between shots. Cheek weld is not maintained during the exercise. With the second rifle, I maintain my cheek weld due to the rifle being mag fed and there is much less heat generated. Each group is shot in approximately 3 minutes total. The rifle was allowed to cool ~5 minutes and then the second goup was fired. Once the 2 groups were fired with the 260, I would pick up the first rifle and then fire another round of my "round robin" testing. Both rifles were fired prone off of bipods and rear bags.
Target one ammo was loaded with Neil Jones custom dies on an RCBS. Target one brass was neck turned (twice), annealed, trimmed, primer pockets uniformed, brass within 0.8 gr of each other, powder was thrown with a chargemaster then weighed on a beam scale. The bullets used for each 5 shot loading were measured from ogive to base and were within 0.0015" of each other.
Target 2 ammo was loaded with RCBS bushing sizer, Forster Ultra seater and used a Co Ax press. Brass was turned, trimmed, sized and loaded. Nothing special was done here.
If you need any other information, please let me know. Thanks.
I'm going to presume it's a load issue with 2 different rifles. Here it goes...
I went out at 200 yards to test some loads and see what would happen with seating depth changes. The first picture was shot "round robin". I would shoot one round that was 0.005" off the lands and then progress until I had shot all 4 loads ending at 0.020". I adheared to a 2 minute shot interval. The next round was shot from right to left etc...
Between the 5 total shot stings, I would shoot groups with the 260 (which we'll get in to next). Here's the results with the first rifle.

The issue I have is the horizontal stringing in the first group shown which is 0.005" off the lands. Vertical C-C is less than 0.45" Horizontal is 1.3". All the other groups look "similar" although terrible.
My 260 has 2 group that show similar results on groups #5 & 6. The groups were shot left to right, 5 shots at a time with ~10 seconds between shots. I varied charge weight and OAL on these groups but when the vertical went away, the horizontal gets excessive.

Vertical on #6 (C-C) is ~0.16", Horizontal (C-C) ~1.6".
Since the groups in the first pic were shot round robin, and the groups in the 2nd pic were shot in "groups", I know that wind is not the issue. Anybody care to tell me what's going on here and where I need to go for correction?
The first rifle is a single shot and there is much more time between shots. Cheek weld is not maintained during the exercise. With the second rifle, I maintain my cheek weld due to the rifle being mag fed and there is much less heat generated. Each group is shot in approximately 3 minutes total. The rifle was allowed to cool ~5 minutes and then the second goup was fired. Once the 2 groups were fired with the 260, I would pick up the first rifle and then fire another round of my "round robin" testing. Both rifles were fired prone off of bipods and rear bags.
Target one ammo was loaded with Neil Jones custom dies on an RCBS. Target one brass was neck turned (twice), annealed, trimmed, primer pockets uniformed, brass within 0.8 gr of each other, powder was thrown with a chargemaster then weighed on a beam scale. The bullets used for each 5 shot loading were measured from ogive to base and were within 0.0015" of each other.
Target 2 ammo was loaded with RCBS bushing sizer, Forster Ultra seater and used a Co Ax press. Brass was turned, trimmed, sized and loaded. Nothing special was done here.
If you need any other information, please let me know. Thanks.