New Altaros Slugs ATP King cal .257 84gr

[Nealgl1985]

Got back out for the 100 yard testing. I sighted in for 100 yards and shot 2 groups. 1 group I pulled the 3rd shot so I took an extra and didn't count it. The group with some holes lower on the target was me dialing in for 100.

I could barely see the target even with nice glass. I was shooting into the dark woods. I did my best.

This is just to show others what these will do even at high speeds. These were accurate at 870 fps as well.

When the mosquitoe population dies down some from all this rain I'll shoot some 150 and 200 yard groups, but i have to go into the woods for that.

 

[CanMike]

Looks good. Did you get some 200 yard shots in? Is your 257 Texan upgraded or stock.

Mike

 

[Nealgl1985]

@CanMike I did not. My compressor went out and I haven't had any big bore out shooting again. Only the gk1 with the little air I have left in my tank . I want to see what the slugs can go at longer ranges though so that will be happening in the next month or 2 hopefully.

 

[Healthservices]

...

To the question of which gun is shooting these with a TJ barrel I am really wondering if they are testing the upcoming AAA .257 HPS.

So you think the up coming AAA .257 HPS will be able to hold a 16.9mm slug in its magazine?



Allen

 

[CanMike]

@CanMike I did not. My compressor went out and I haven't had any big bore out shooting again. Only the gk1 with the little air I have left in my tank . I want to see what the slugs can go at longer ranges though so that will be happening in the next month or 2 hopefully.

@CanMike I did not. My compressor went out and I haven't had any big bore out shooting again. Only the gk1 with the little air I have left in my tank . I want to see what the slugs can go at longer ranges though so that will be happening in the next month or 2

What pressure are your shooting? 3000PSI?

 

[Nealgl1985]

@CanMike

 

[CanMike]

So 990’FPS at 2600 PSI. That’s pretty good. Probably can easily get to 1020-1050 range on higher pressure.

But I believe the other Altaros slugs are recommended at slower speeds. Not sure it applies to these as their BC was calculated in the mid / high 900 (960FPS) and they are the largest ones Altaros makes I think.

Mike

 

[Nealgl1985]

Yes, a maxed out stock 257 texan should be able to send these over 1000 fps. They held up at 990 well so I'm assuming 1000+ should work.

I'm not a slug expert, but I thought I read you want to stay under 1050fps. I also read that the faster the slug is moving the less wind resistance it has to a point. Maybe that's just pellets. Someone smarter than me can chime in and correct me if needed. I'm still learning so give me a break .

I'm sending my 257 off to Doug at maddog stocks and he's going to go through it and take it the next level. When I get it back I will shoot those slugs out to 200+ yards as long as the accuracy holds up.

I also purchased a fx ballistics chronograph so I will post bc numbers as well.

 

[CanMike]

I was going to try and shoot at 1020ish. I agree over 1050 you’re approaching mach 0.95 which is well Into transonic.

So at least theoretically that would increase instability.

Can’t wait to hear your progress. I should be getting mine in a couple months. Also going get a mad dog stalk for it.

What’s Doug going to do? Curious now.

Mike

 

[Healthservices]

If i remember correctly I think the twist rate has a impact as to what speeds the slug can stay stable up to.

Allen

 

[CanMike]

The 257 I believe is 1:14. From what I understood it was more the weight. Heavier like over 100 grain need a different twist like a 1:10. So the 257 maxes out in the 80-90 range for slugs.