I have 3 examples I'm curious about .....
1. Jsb 177 .... 16.1 grain. I'm shooting it out of 5 different barrels... all w 1 in 17 twist. A couple are unchoked but the others are choked. At 900 fps, it shoots quite well at 50 yds but seems to get blown around quite a bit at 75. At 930 fps, it's better, maybe even really good at 75 but seriously bad at 100. At 970, it's still good at 50 and 75 but only okay at 100. Will not hit much of anything at 150. Some barrels are better than others but none really seem to break the 100 yd barrier well with those. By contrast, in a zero to low consistent wind, several of my 20 ft lb shooting 10.3s still seem stable past 150 in the same barrels. They ARE wind sensitive though. I know there are MANY of us that would like to figure these out.
2. Jsb 22 Monster Redesign 25.4 grain. Out of my Daystate barrels (LW), the more , the merrier till somewhere over 1k fps. Mine seem stable as far as I can shoot them and still see. ... 1 in 17
3. Jsb King Heavy MkII ... 33.4. As stated in another post, at 900 fps muzzle velocity, they hold together till somewhere beyond 200 and then really fall apart. I've not run them faster because of the air usage and rifle behavior. 1 in 17 and 1 in 28 have been tried.
I've read most of what has been posted in theory about twist rates but still find these puzzling.
I guess what I'm asking is whether each could benefit from more or less spin and what are realistic expectations?
Bob
1. Jsb 177 .... 16.1 grain. I'm shooting it out of 5 different barrels... all w 1 in 17 twist. A couple are unchoked but the others are choked. At 900 fps, it shoots quite well at 50 yds but seems to get blown around quite a bit at 75. At 930 fps, it's better, maybe even really good at 75 but seriously bad at 100. At 970, it's still good at 50 and 75 but only okay at 100. Will not hit much of anything at 150. Some barrels are better than others but none really seem to break the 100 yd barrier well with those. By contrast, in a zero to low consistent wind, several of my 20 ft lb shooting 10.3s still seem stable past 150 in the same barrels. They ARE wind sensitive though. I know there are MANY of us that would like to figure these out.
2. Jsb 22 Monster Redesign 25.4 grain. Out of my Daystate barrels (LW), the more , the merrier till somewhere over 1k fps. Mine seem stable as far as I can shoot them and still see. ... 1 in 17
3. Jsb King Heavy MkII ... 33.4. As stated in another post, at 900 fps muzzle velocity, they hold together till somewhere beyond 200 and then really fall apart. I've not run them faster because of the air usage and rifle behavior. 1 in 17 and 1 in 28 have been tried.
I've read most of what has been posted in theory about twist rates but still find these puzzling.
I guess what I'm asking is whether each could benefit from more or less spin and what are realistic expectations?
Bob