Anyone on board with experience using FX Impact X slug liners in .22 600 mm vs 700 mm? I thought I saw somewhere that the 600 might be a better option?
Impact X slug liners 600 vs 700 mm
- Thread starter davester
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I don't have experience with either in an Impact. Currently using a 600mm on my Crown 22 though.
The 700mm would be appropriate if you want to shoot the heavier slugs, like 26 or 27gr, as the added length is needed in order to get those above 930fps.
The 600mm is ideal for the lighter slugs, like 23 and 24gr. I get the 23gr going 925fps at 155bar. The 24gr D-Rig slugs should be about 10fps slower... I'll know exactly next week when they come in.
One could say the 700mm would let you run the lighter slugs using less reg pressure, which is true. But consider that the 600 and 700mm have different twist rates, 1:18 and 1:16 respectively, and you can see that the 700mm barrel is intended for the heavier slugs.
That said, I measured the twist rate on my 600mm barrel and got 1:16. Considering that I've recorded the 22.5 and 23gr slugs wobbling, it's possible that the lighter slugs don't like the faster twist, which is why I ordered up a couple hundred 24gr to try.
The 700mm would be appropriate if you want to shoot the heavier slugs, like 26 or 27gr, as the added length is needed in order to get those above 930fps.
The 600mm is ideal for the lighter slugs, like 23 and 24gr. I get the 23gr going 925fps at 155bar. The 24gr D-Rig slugs should be about 10fps slower... I'll know exactly next week when they come in.
One could say the 700mm would let you run the lighter slugs using less reg pressure, which is true. But consider that the 600 and 700mm have different twist rates, 1:18 and 1:16 respectively, and you can see that the 700mm barrel is intended for the heavier slugs.
That said, I measured the twist rate on my 600mm barrel and got 1:16. Considering that I've recorded the 22.5 and 23gr slugs wobbling, it's possible that the lighter slugs don't like the faster twist, which is why I ordered up a couple hundred 24gr to try.
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I've tried both.
Both are very accurate, I just don't like seeing wobble. It could be they are being spun too fast for their weight.
I was surprised when I measured the twist at 1:16 when it was supposed to be 1:18 for the 600mm barrel.
Both are very accurate, I just don't like seeing wobble. It could be they are being spun too fast for their weight.
I was surprised when I measured the twist at 1:16 when it was supposed to be 1:18 for the 600mm barrel.
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Yes I have, both the 2S nose and the HP.
Except for the difference in BC, both seem to have the same accuracy.....1 to 1.5" at 100yds off the trunk of my car.
Except for the difference in BC, both seem to have the same accuracy.....1 to 1.5" at 100yds off the trunk of my car.
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