Post by: Sabotloader on July 09, 2015, 12:35:22 PM
This morning I ran to the farm and posted a target up at 180 yards. The Garbanzo Beans were just to tall and at 200 they obscured the target.
I was shooting the same 45 Knight DISC Extreme and I also took my 50 Ultra-Lite as another testing tool. I took 5 shoots on target with the 45 and two with the Ultra-Lite. And again I was shooting 110 gr. of T7-2f. The grouping certainly were not the best and at 180 yards I was definitely showing some yawing was occurring.
There are a couple of possible problems, other than the twist rate. In the 1-30 that bullet will need every bit of twist it can get. It needs to make every turn. In that thought - if the bullet slips in the sabot at all or skips some lands going up the barrel it will not get the rotation it needs. Remember mathematics already says it con not be shot from a slow twist, and if there is any slippage at all there is no chance. The MMP sabot seems to fit the bullet a little tighter than does the Harvester and the MMP seems a little tighter going down the barrel. Then I am not helping my cause with the barrel heat that is existing.
Here is the target as shot.
(https://hunting-washington.com/smf/proxy.php?request=http%3A%2F%2Fimg.photobucket.com%2Falbums%2Fv130%2Fsabotloader%2FComposit%2520.jpg&hash=ce7ff00b6eccfbe92cad8ac8ab133a2f9d6eb9b4) (http://smg.photobucket.com/user/sabotloader/media/Composit%20.jpg.html)
The first group was fired one shot right after the next. The second group of two were shot with some cooling time between shots. Then I switched to the 50 Ultra-Lite using the same 110 grain load and a MMP 40x50 Blue sabot. Even on a cool barrel that loader easier than I wanted it to, but I was loaded so I shot it and then decided one more shot just for the heck of it. I can not say I was pleased with any of the shots or the groups but it was something I felt I needed to know.
When I walked back out to the target and looked at the holes I felt there was some yawing showing on all of the paper hole. Removing the target from the plywood verified that thought. Then as a better indication of what was happening I plugged some bullets in the holes and it became really obvious in most of the wholes... All of this a created another "I wonder" I wonder what is drooping the nose of the bullet or the tail of the bullet when it hits the target.
Upping the charge to my normal 120 grain load or even higher would probably fix the problem - but even then I would be reluctant to use the slow twist
This is a good example of what I was seeing and it was one of the more dramatic holes.
(https://hunting-washington.com/smf/proxy.php?request=http%3A%2F%2Fimg.photobucket.com%2Falbums%2Fv130%2Fsabotloader%2FIMG_0866.jpg&hash=e915a363519a20fba8c6d369804c1a16d03e4faa) (http://smg.photobucket.com/user/sabotloader/media/IMG_0866.jpg.html)
Post by: oneshot12 on July 09, 2015, 12:58:01 PM
Post by: Sabotloader on July 09, 2015, 02:16:18 PM
:bash: well darn it guess its kind of back to the drawing board then? the heat will do that some times too but i am sure you know that Sabot loader .T tend to think along the lines as you the faster twist is much better. it would be nice if they were to come up with some bullets you can shoot in the slower twist barrel think it would be loads of fun . :chuckle: :chuckle: :chuckle:
Ya, that is why Lehigh made the 40x185 CF - I shoots great from the slower twist rifles...
You can see the 185 in these pics. It is built shorter so that a slow twist can shoot it with very good accuracy..
(https://hunting-washington.com/smf/proxy.php?request=http%3A%2F%2Fimg.photobucket.com%2Falbums%2Fv130%2Fsabotloader%2FCollection.jpg&hash=e594ce4cb3b63d1409620986ca3d91d565d4a9d0) (http://smg.photobucket.com/user/sabotloader/media/Collection.jpg.html)