Approximate Velocity Hornady 150g interlock (not boat tail)

[Hook'N'Bullet]

Afternoon Gents,

I know this might be a long shot (pardon the pun )

Would anybody out there know the approximate velocity I can expect from a 1in11, 20 inch barrel of factory loaded 308 Win, Hornady American Whitetail 150 grain interlock soft points?

A buddy of mine dropped a deer at 400 odd meters (he's a professional guide) so it has me interested in trying to make a D.O.P.E chart for my rifle (I've never shot past 175 to 200 meters). Unfortunately, I have no access to a chronograph or a range far enough to calculate the velocity by inches dropped.

I know the box states 2820 with a 24 inch test barrel which is seldom accurate anyway. Given that there's an average bleed of speed of around 20 to 30 fps per inch according to the web, I though I'd have it sorted and be able to make a rough DOPE chart to get started. But talking to a guy in my club, said his 6.5 creedmore dropped nearly 200 fps at the muzzle with a 22 inch barrel. 100 FPS per inch?

Anyway, if any of you fine gentlemen have had experience with this, it'd be greatly appreciated

Regards,

H&H

 

[CarlW]

Afternoon Gents,

I know this might be a long shot (pardon the pun )

Would anybody out there know the approximate velocity I can expect from a 1in11, 20 inch barrel of factory loaded 308 Win, Hornady American Whitetail 150 grain interlock soft points?

A buddy of mine dropped a deer at 400 odd meters (he's a professional guide) so it has me interested in trying to make a D.O.P.E chart for my rifle (I've never shot past 175 to 200 meters. Unfortunately, I have no access to a chronograph or a range far enough to calculate the velocity by inches dropped.

I know the box states 2820 with a 24 inch test barrel which is seldom accurate anyway. Given that there's an average bleed of speed of around 20 to 30 fps per inch according to the web I though I'd have it sorted and be able to make a rough DOPE chart to get started but talking to a guy in my club said his 6.5 creedmore dropped nearly 200 fps at the muzzle with a 22 inch barrel. 100 FPS per inch?

Anyway, if any of you fine gentlemen have had experience with this, it'd be greatly appreciated

Regards,

H&H

Compared to some cartridges, the .308 is not overly sensitive to reduction in barrel length. However, I would borrow a chronograph rather than just guess at it. I'd then validate drops on actual targets. I'm far from being any kind of marksman; however, in my small experience, at longer range, little errors become very big errors.

Kind regards,

Carl

 

[Hook'N'Bullet]

Compared to some cartridges, the .308 is not overly sensitive to reduction in barrel length. However, I would borrow a chronograph rather than just guess at it. I'd then validate drops on actual targets. I'm far from being any kind of marksman; however, in my small experience, at longer range, little errors become very big errors.

Kind regards,

Carl

Yeah I complete agree. Its a game of angles. Thanks for the tips

 

[enfieldspares]

I'd have thought about the same as the old NATO Ball like this?

 

[paul o']

While playing years ago with 150gr interlock out of a sako 85 they were around 2750 ish as I remember they were 13 inches low at 300.

 

[ashray]

good evening my 20" rpr produces an average of 10 shots of 2641 fps this is with a federal 210 primer lapua case n140 <44grs> safe in my rifle. 150gr sp.

 

[Milligan]

I would expect 2600 to 2700 and 4 to 5 min drop at 300.
Only way to know for sure is to actually shoot at those ranges to appreciate what is to consistently get sub 1. Moa accuracy

 

[243varmint]

Get the Strelok ballistic app.
Get your bullets Chrony'd and input data.
You can put your scope reticle in the app and it gives you hold over as well.

 

[ejg]

Best would be actually to put up some targets at 300, 350, 400 yds. You will also see your groups at that distance and the drops. With that info you can reverse calculate a drop chart that is more accurate than one based on muzzle velocity or ballistic app.
edi

 

[antsa]

Can't help you with Hornady but the other day I tested Sierra Pro-Hunter 150gr in my Sako 85 Hunter with the 570mm,1:11" barrel. Used seven charges of ADI 2206H (H4895): 41.7, 42.0, 42.3, 42.6, 42.9, 43.2 and 43.5gr. Best result was the 42.0gr. Three shot group of 0.36 MOA, off the bench, but that's the way I do all my load testing. Five shots of this load over the MagnetoSpeed resulted in an average muzzle velocity of 786m/s (2579fps) with an ES of 3m/s and an SD of 1.12.

With a 100m zero the Shooter app says 0.3mrad @ 150m, 0.8mrad @ 200m, 1.2mrad @ 250m, 1.8mrad @ 300m and 3.1mrad @ 400m. Haven't verified these drops in the field yet. That will be my next step. Well, almost. Can't shoot 400m anywhere on my property. I'd be endangering the neighbour's cows.


Cheers

 

[25 Sharps]

I'd have thought about the same as the old NATO Ball like this?

View attachment 147273

NATO ball is boat tail I’m guessing so has a higher BC, the interlock has a bc of .338 vs .397 for the nato ball which will make a difference as the distances stretch out