As indicated in my previous posts, I’ve been playing around with a 2020 K1 .25, mostly getting it dialed for pellet shooting. This weekend, we’ve been playing around with slugs and since I’m a big fan of the Altaros in the Panthera, I decided to skip the baby stuff and jump right in with their 51 grain .224 offering, which has a BC of 0.21 
. I wasn’t terribly optimistic because the K1 twist is fairly slow and these are boat tails.
First off, these slugs are a PERFECT fit for the mag, requiring a firm push and having no option to move - exactly the right length. I set about playing with reg pressure and power wheel settings to get a sense of potential speed, noise and feel of the shot cycle. I’m not interested in shooting a loud bucking bronco and moreover experience tells my that sedate = accurate. I’ll cut to the chase with a few metrics. Maxed out speed at 200bar was 995fps, or 113fpe. Perhaps one could get to 120fpe with a 220bar pressure, but that’s a bit impractical and the gun was angry at 113fpe. I proceeded to work my way down in pressure and wheel setting and found that the gun settled down markedly at around 950fps (~102fpe) at 185 bar reg pressure. I then proceeded to evaluate accuracy at that setting at 50 yards. Long story short, I found highest accuracy and Zen at 1 or 2 clicks below that level at 930/915 fps.
Before getting into more detail on accuracy, I want to remark on how sedate and quiet this gun is shooting at 930fps (~98fpe). It is fitted with a 30cal Sumo and is 3dB quieter than popping open a can of soda. Here’s a video demonstrating that fact and the sedate nature of the shot cycle:
I’ll be back with a 100y group, which I expect to be pretty good, based on the grouping at 50.
. I wasn’t terribly optimistic because the K1 twist is fairly slow and these are boat tails.First off, these slugs are a PERFECT fit for the mag, requiring a firm push and having no option to move - exactly the right length. I set about playing with reg pressure and power wheel settings to get a sense of potential speed, noise and feel of the shot cycle. I’m not interested in shooting a loud bucking bronco and moreover experience tells my that sedate = accurate. I’ll cut to the chase with a few metrics. Maxed out speed at 200bar was 995fps, or 113fpe. Perhaps one could get to 120fpe with a 220bar pressure, but that’s a bit impractical and the gun was angry at 113fpe. I proceeded to work my way down in pressure and wheel setting and found that the gun settled down markedly at around 950fps (~102fpe) at 185 bar reg pressure. I then proceeded to evaluate accuracy at that setting at 50 yards. Long story short, I found highest accuracy and Zen at 1 or 2 clicks below that level at 930/915 fps.
Before getting into more detail on accuracy, I want to remark on how sedate and quiet this gun is shooting at 930fps (~98fpe). It is fitted with a 30cal Sumo and is 3dB quieter than popping open a can of soda. Here’s a video demonstrating that fact and the sedate nature of the shot cycle:
I’ll be back with a 100y group, which I expect to be pretty good, based on the grouping at 50.
