115gr VS 124gr for new gun break in

I use 124's exclusively these days. Partly because I bought a ton of zero Bullets back when they were still reasonable, and all of my 9's (15 or so) like them. I just changed over to canpro's recently and haven't seen a reason to change bullet weights.
 
Breaking in a new gun …

not a "must do" unless it's for a barrel for precision and long distance rifle shooting ...
 
Gundoggy said:
HK's are sprung for heavier recoiling 9mm like 9mm NATO rounds.

On my P2000 I had a few bobbles with 115 gr at first. I used 124 and 147 gr to 'break in the spring'. After about 500 rounds, it ran just fine, even with 115 gr ammo.
I suspect, if you just shot a bunch of 115 gr until it breaks in, that should work too.
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Agree/\ The 124 grain heads will almost assure no failures to feed and eject. The 115 grainers will have a little less recoil impulse which could affect functional reliability. If that doesn't bother you, then 115s will not be a problem. Fire away and enjoy!
 
Antoine22 said:
Where did you read that you need to break in a gun, hence using specific bullet weight?
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Well, it is not literally break-in and I have not found any relation to bullet weight but I have noticed those semi auto handguns I bought new shot better after 1000 rounds and even better after 2000. So, it's a mechanical instrument with moving parts and some devices work better after a little bit of use.
 
Shoot both, find out which one shoots closer to point of aim. Stick with it. Then start home loading and tune your loads accordingly.
 
Dmitri_W said:
How? By that same logic 147 grain should have more recoil. And I find it it’s quite the opposite.
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The energy of a 115 at high velocity and a 147 at low velocity is similar. So the total recoil energy is similar.

However, as shooters, we are interested in "felt recoil".

If the energy is transmitted to our hand quickly (the fast 115 gr bullet) the kick seems stronger than the same energy being delivered over a longer period of time (the slower 147 gr bullet).

Competitors who are involved in shooting where rapid (but accurate) shots are called for will often use a 147 gr bullet because it has less felt recoil.

For the OP, the probable only significance of the various ammo choices is where the bullets hit the paper. If he rear sight is not adjustable for elevation, his "best" ammo is the one that prints holes level with the bull.
 
Ganderite said:
The energy of a 115 at high velocity and a 147 at low velocity is similar. So the total recoil energy is similar.

However, as shooters, we are interested in "felt recoil".

If the energy is transmitted to our hand quickly (the fast 115 gr bullet) the kick seems stronger than the same energy being delivered over a longer period of time (the slower 147 gr bullet).

Competitors who are involved in shooting where rapid (but accurate) shots are called for will often use a 147 gr bullet because it has less felt recoil.

For the OP, the probable only significance of the various ammo choices is where the bullets hit the paper. If he rear sight is not adjustable for elevation, his "best" ammo is the one that prints holes level with the bull.
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Well, sorry to say it but you are completely wrong. Two things to consider, a 115-grain projectile will use more powder to achieve the velocity needed to produce similar results to a 147-grain projectile. Increased powder charge combined with increased velocity produces more recoil. I will spare everyone a long math example.

But if you want to verify, just calculate recoil energy (google for assistance). As an example: on my Tanfoglio Stock 2, the 147-grain projectile will generate 2.88 ft.lbf of recoil energy, while 115 grain projectile out of the same gun generates 3.21 ft.lbf.
 
Dmitri_W said:
Well, sorry to say it but you are completely wrong. Two things to consider, a 115-grain projectile will use more powder to achieve the velocity needed to produce similar results to a 147-grain projectile. Increased powder charge combined with increased velocity produces more recoil. I will spare everyone a long math example.

But if you want to verify, just calculate recoil energy (google for assistance). As an example: on my Tanfoglio Stock 2, the 147-grain projectile will generate 2.88 ft.lbf of recoil energy, while 115 grain projectile out of the same gun generates 3.21 ft.lbf.
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Read again.

I said the 147 gr load will feel like less recoil.

You are saying the 147 has less recoil.

Please explain "you are completely wrong".
 
I think that the first batch of those guns were having some issues due to a very heavy recoil spring and some were stove piping, which is why they say 124... With that said, I owned lots of HK and the manuals never ever said anything about break-in periods.
It is a polymer wonder, shoot the thing, it is indestructible.
 
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