Best Speed for .30 cal JSB and FX Pellets?

[kaylaindy]

Hey guys. I'm trying to tune this .30 cal SK19. Before I waste all my pellets: 

Can you tell me some good pellet speeds for these 4 pellets? 

JSB 44.75gr

JSB 50.15gr

FX 46.30gr

FX 50.15gr

Thanks! -Nate 

 

[triggertreat]

I would start in the 900 to 920 FPS range and work around that area with fine tuning while shooting groups of three at 30 to 50 yards so you can see group results changing. Not the same gun, but I have had the JSBs do very well between 900 and 1,024 FPS. If the gun likes them, the JSBs can handle those speeds very well.

 

[jps2486]

For JSB 44 grainers, 890 fps works for me. Very accurate at 100 yards. Don't get sucked into the speed thing.

 

[2L8]

For JSB 44 grainers, 890 fps works for me. Very accurate at 100 yards. Don't get sucked into the speed thing.

+1

 

[kaylaindy]

Thank you! -Nate 

 

[Motorhead]

For JSB 44 grainers, 890 fps works for me. Very accurate at 100 yards. Don't get sucked into the speed thing.

Another in agreement for the 44.75's ... still good at 910, tho it appears to get worse much above that in the TJ barrels

 

[bandg]

YOUR barrel may like a different speed than that of another shooter. There seems to be widespread variability in this. Shot count important? Maybe a bit slower could be helpful. Trajectory will usually be better with more velocity. All relative. 890 might be "good" but 950 might be "better". Only shooting YOUR gun will tell.

 

[pesty3782]

My Impact shoots the 44's right at 905 and they are very accurate....It took a lot of testing at different speeds to find this "jem" of a speed for the impact

Tony P.

 

[kaylaindy]

I'll try that 905 on my Impact for sure. SK19 only lasted 24 hours. The 44's did great at 890. 

 

[Rock]

What is everyone who posted on here’s level of aaccuracy at 890 or 905 fps? Single hole? Ragged hole? What liner are you using and barrel length? I’m shooting the FX 44.75 grain out of my Impact with 600mm barrel 1:22 twist STX Superior at 25 yards and I’m literally single holing at 937 fps. Haven’t tried out further due to space limitation but will do more testing.

 

[triggertreat]

That's the same results I am getting with the same liner using the 44.75 JSBs.

 

[Rock]

That's the same results I am getting with the same liner using the 44.75 JSBs.

And, out of the original Smooth Twist barrel I’m seeing speed of 955 fps with the same group results. This is with reg pressure set at 150 bar so I’m not getting my shot counts but I’m wondering what else we are sacrificing besides shot counts. Is spin drift going to have an issue at longer distance due to 1:22 twist rate and speed ?

 

[Centercut]

It's so easy to get wrapped up in speed... I've been shooting my .30 FX Bobcat Mk2 at around 855 fps and its as accurate as any gun I own. Why would I need it faster? Plus, the gun operates much more smoothly and is significantly more efficient. Don't get brainwashed by speed, especially with pellets! I shot a quick N50 card with it, 25 straight shots, no sighters, straight from the tin, and scored 247. Not bad...

 

[18.13]

Are the FX pellets actually 46.3 has anyone weighed them

 

[Rock]

It's so easy to get wrapped up in speed... I've been shooting my .30 FX Bobcat Mk2 at around 855 fps and its as accurate as any gun I own. Why would I need it faster? Plus, the gun operates much more smoothly and is significantly more efficient. Don't get brainwashed by speed, especially with pellets! I shot a quick N50 card with it, 25 straight shots, no sighters, straight from the tin, and scored 247. Not bad...

How is it being brain washed if it’s accurate and fast? Bucks the wind better with more penetration and ft-lb for kill power. Not everyone is a paper puncher.

 

[Centercut]

How is it being brain washed if it’s accurate and fast? Bucks the wind better with more penetration and ft-lb for kill power. Not everyone is a paper puncher.

I’m more of a hunter than paper puncher. Bucks the wind better faster? Really? I disagree. So do most guys that shoot .30 caliber pellets. But of course you are entitled to your opinion.

 

[Rock]

I’m more of a hunter than paper puncher. Bucks the wind better faster? Really? I disagree. So do most guys that shoot .30 caliber pellets. But of course you are entitled to your opinion.

Opinion? No… experience!

 

[Centercut]

Opinion? No… experience!

Gotcha. Science be damned! No problem. Ever wonder why the top shooters keep the .30 cal at or under 900 fps when shooting in the wind. But I do respect your opinion. Errr, ahhhh, I mean experience.
PS., I’m talking about 100 yards, not 25 yards since that’s all the further out your experience takes you, correct?

 

[Bigragu]

Gotcha. Science be damned! No problem. Ever wonder why the top shooters keep the .30 cal at or under 900 fps when shooting in the wind. But I do respect your opinion. Errr, ahhhh, I mean experience.
PS., I’m talking about 100 yards, not 25 yards since that’s all the further out your experience takes you, correct?

…. patiently awaiting the next move…like this guy…

 

[Revoman]

Are you the one in the tube or the one with the lumpy pants?
mike