Been playing with numbers for an impact. Kind of wish UA didn’t talk me into a 22 cal. I’ve owned a .25 cal marauder 50 fpe w/ 33.95 grain JSB pellets. Wanting to try the 33.95 slugs from JSB in .25 cal or should I still with what I have?
.22 cal slug vs .25 cal slug
- Thread starter Airgun.Sniper
- Start date
Are you wanting to stay at the same length, go longer, or maybe shorter? If you are staying at the same length and already have a probe, then you need a barrel, transfer port and magazine. If you are going longer or shorter a complete barrel kit and magazine would be needed. Hope this is understandable.
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I've got my 22 impact at 75 fpe in 22. If you use the pin probe already you put the 25 sleeve on it and I was under the impression it's a liner and mag swap to get where you want if your mod can handle 25. I never did enough research to see if the liner gets thinner and still fits in the barrel tube or if the barrel tube gets a larger id for a 25 liner mandating a barrel kit. Somebody will correct me if I'm wrong.
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Does your Impact have a slug liner ?
Maybe try some. 218 34gr H&N Heavy slugs.
Your Impact should easily shoot those 1000+fps
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I have slug liner and slug power kit. I’m sitting t 16 on my macro wheel 5 on my micro wheel. 145 bar on my reg. 850 fps right now. I plan to see if I can get up to 950-1000 fps. I just wished I’d bought a 25 cal. Just found a place to shoot a few ground hogs at a farm
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I have a .25 shooting slugs 1,030fps and a .22 shooting slugs 955fps. I have to shoot groundhogs the exact same way with both guns or I don’t recover them. “Knock down power” begins to start with an airgun at .30 caliber unless you’re shooting pip squeak critters.
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If I have difficulties tuning I’m going to order a 30 cal liner and go back to shoot pellets
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If you switch to .25, skip the 500mm. The window is too small. Even with a 600mm, getting the results the guys with 700mm barrels were getting with 40+ grain slugs was an uphill climb. Barrel length gives you more room to play around with weights and speeds.
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H&N also makes 36, 38 and 40 grain .218 heavy slugs.
A 40gr slug from a 22 or 25 caliber going the same speed will have the same ftlbs of energy.
A 40gr slug from a 22 or 25 caliber going the same speed will have the same ftlbs of energy.
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I'm 700mm and it comes with its own new problems, as I read they're even more pronounced on the 800. I did achieve 1050 with 34s and could send anything lower weight supersonic. I detuned into the 900s because even the 34s were ocassionally cracking and losing their precision thanks to a weather change.
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The tuning of the 25 is slightly less finicky I think due to the bore size not requiring as much pressure. It was easier for my to get my buddies 500mm 25 to a specific power level than it was for my 22 700mm.... Then again it's mine and I'm holding myself to better standards.
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