Which round will have more recoil?

[casper1]

Which round will have less recoil out of a PM9 and why?

1. Speer Dold Dot 115gr standard pressure.

OR

2. Speer Gold Dot 124gr standard pressure.

Thanks

[Rubb]

Neither are bad and without going into the physics of it I'll say...you need to decide.
FELT recoil is what you should be concerned with and we're all different.

[getsome]

Welcome to Kahrtalk casper1!!!....Like Rubb said either one wont be bad and I seriously doubt you will be able to tell the difference in recoil between them at all...Lots of folks here with 9's shoot the 124 gn Gold Dot short barrel and seem to like them but your choice and if both feed good with no hickups then go with what you like and with either one you will be well armed....Again welcome to the club!!!

[DavidR]

The 124 short barrel is plus P so it will have more felt recoil than the 115.

[b4uqzme]

I agree that the severity of felt recoil between those two rounds will be negligible. However, you may find you PREFER the way one feels over the other so try 'em out. But DavidR is correct. The charge pushing the heavier 124 grain bullet should, technically, produce more recoil. Newton's third law of motion: "Every action is attended by an equal and opposite reaction." Yet I prefer the way the 124gr bullet feels out of my MK9.

[happypuppy]

The 2 I like in my cm 9 are the 124hst and critical defense 115. The 115 has a notable less amount of recoil


When I see an adult on a bicycle, I do not despair for the future of the human race. --H.G. Wells

[sas PM9]

Which round will have less recoil out of a PM9 and why?

1. Speer Dold Dot 115gr standard pressure.

OR

2. Speer Gold Dot 124gr standard pressure.

Thanks

c1:

The two cartridges in question are very equal in muzzle energy and thus roughly the same recoil energy.
The 115gr moves at 1210fps and carries 374 ft lbs of energy.
The 124gr moves at 1150fps and carries 364 ft lbs of energy.

I'm not sure that you would be able to notice the difference.

That said I will comment that I can definitely tell the difference between a 115 and a 147 gr round.
The 115 is noticeably more "snappy" where the 147 has more of a "push".

-steve

[casper1]

The 124 short barrel is plus P so it will have more felt recoil than the 115.
Not talking about +p. As the OP says, "standard pressure" is what I'm asking about.

And now, can we also forget about "perceived recoil" vs "actual recoil?"

For the sake of the question, let's invent a hypothetcal device that measures recoil force.

Which of the aforementioned rounds will register more recoil on this device?

This is just a simple, straightforward question. Some of you guys sound like lawyers with your answers.

So let's throw out the effects of humidity, wind direction and speed, different moon phases and the like.

Negligible as the difference may be, there will be SOME difference, right?

I'm mostly curious about which round will allow for a quicker follow-up shot. And I don't care if the difference is neglible.

Geez, I thought this was a simple question.

[DavidR]

Not talking about +p. As the OP says, "standard pressure" is what I'm asking about.



Yes, I know that. I was responding to the post that said to use 124 g short barrel. Short barrel are +p and are not comparable to the standard pressure you asked about. I'd be interested in what the hypothetical device told us but I doubt I could tell a difference between standard 115 and 124.

[casper1]

Yes, I know that. I was responding to the post that said to use 124 g short barrel. Short barrel are +p and are not comparable to the standard pressure you asked about. I'd be interested in what the hypothetical device told us but I doubt I could tell a difference between standard 115 and 124.

Ok, never mind you guys. I give up. I guess it was a stupid question.

[timmy]

Today I fired 50 rounds of 124grn HST right after firing 115grn tula fmj and i could hardly tell the difference

[RRP]

For the sake of the question, let's invent a hypothetcal device that measures recoil force.

Which of the aforementioned rounds will register more recoil on this device?


Geez, I thought this was a simple question.




The two cartridges in question are very equal in muzzle energy and thus roughly the same recoil energy.
The 115gr moves at 1210fps and carries 374 ft lbs of energy.
The 124gr moves at 1150fps and carries 364 ft lbs of energy.

I'm not sure that you would be able to notice the difference.




Ok, never mind you guys. I give up. I guess it was a stupid question.

Your question was answered in post 7, shown above. Technically the 115 gr produces slightly more muzzle energy than the 124 gr, in the example you posed in your opening post.

The difference in the energy generated by the two rounds in your example would likely be imperceptible.

You can learn more about muzzle energy by using a calculator like this one:
http://www.georgia-arms.com/mecalc.html

[Rubb]

http://www.handloads.com/calc/recoil.asp

[Rubb]

Based on load data found here (http://www.handloads.com/loaddata/default.asp) using the closest to matching Speer's listed velocities and keeping powders the same....
I found this.....
124g w/ 4.1 gr. VV N320= 1136 fps.
115g w/ 4.5 gr. VV N320= 1200 fps.

11309

[b4uqzme]

Ok, never mind you guys. I give up. I guess it was a stupid question.

Seems a reasonable question to me. Truth is, despite all the math and calculations, what YOU FEEL is what matters. I went through similar when I was testing various 40SW rounds. I felt LESS recoil with the heavier weight rounds using the only brand I could find that offered a range of weights: American Eagle. To me the difference was perceptible...but not really significant in the end. Next I found that different brands felt different (go figure). Again, not really significant but enough so that I could tell which brands I "prefer". So just try them out and make notes and shoot the ones that feel and perform best for you. Besides, gives you another reason to go shootin'. "Honey, gotta go test some ammo tonight".

[100percent]

No way in heck are you getting 1200 fps out of a short barrel nine mm unless you are shooting less than 95 grain bullets.

[CPTKILLER]

The trade off with lighter bullets & heavier billets seems to be velocity & foot-pounds hitting the target vs. penetration.

[Rubb]

No way in heck are you getting 1200 fps out of a short barrel nine mm unless you are shooting less than 95 grain bullets.

I was using as close to Speer's listed velocities as I could find...obviously.