Author Topic: .40 TS load recipes  (Read 776 times)

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Offline John A.

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Re: .40 TS load recipes
« Reply #15 on: March 09, 2018, 05:44:58 PM »
I don't use them to plink with.  Those are my defensive loads.

And for 40 S&W it is a hot load.

Some because it's a little lighter bullet, and another because my barrel is 5" and the longshot is a little slow burning.  Least compared to many others.

And I'm still running under hogdons max they have listed.  I get velocities somewhere between 1360 and 1402 fps if memory serves correctly.
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Offline John A.

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Re: .40 TS load recipes
« Reply #16 on: March 10, 2018, 11:38:10 AM »
1.125" COL

The extra barrel length, and heavier spring adds about 100 fps to the published numbers.

When people ignorant of guns make gun laws, you end up with ignorant gun laws.

Offline IDescribe

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Re: .40 TS load recipes
« Reply #17 on: March 10, 2018, 12:05:43 PM »
No, they don't.  Not 100 feet/sec.

John, in addition to the charge window Hodgdon reports, it's a good idea to monitor max velocity, as well.  You're a tenth of a grain less than Hodgdon's max load, but you're getting around 100 feet/sec more than their max load.  That suggests there's something going on with your load and gun that was not going on with their load and test fixture.  And while an extra inch of barrel is going to get you a little extra, nowhere near 100 feet/sec.  If you're getting 100 feet/sec greater velocity with a tenth less powder, you should assume you are running at a higher peak pressure than Hodgdon had when they were testing, and .40 has no +P.  You don't want to be overpressure with .40.  That's why they report charge window AND max velocity.  ;)  Something to think about.

Something else to think about is that engineers working for Hornady designed that 155gr XTP to operate optimally within a certain velocity range, meaning that when it strikes soft tissue, the hollowpoint will expand at the proper rate to decelerate the bullet at the proper rate, lose as little of its mass as possible, and penetrate to an optimal depth.  Lots of money and man hours go into designing and testing these bullets.   It's intuitive for us end users to think that faster is better with defensive loads MORE POWER!!! -- but in practice having a bullet going faster than it was designed for can reduce it's effectiveness.  As hollowpoint bullets travel faster and faster, when they strike soft tissue, the hollowpoint expands faster than it was designed for, starts decelerating sooner and faster, loses more mass, and can end up penetrating less than a slower round.   And with defensive loads, penetration is key.

If I were loading Hornady XTP bullets for defense, I would check to see what velocity Hornady is running them at, and try to at least get a little close to that velocity -- because Hornady engineers are the ones who know how fast that bullet should be travelling for optimum performance. 

Hornady has their 155gr XTP doing 1180 feet/sec.  You're 200 feet/sec faster than that.  I would slow that load down for that reason alone -- to get it into the range it was designed to operate in.  I'm not saying I would want it at exactly 1180, but somewhere between 1180 and 1250/1260, testing for best accuracy.
« Last Edit: March 10, 2018, 12:08:04 PM by IDescribe »

Offline John A.

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Re: .40 TS load recipes
« Reply #18 on: March 10, 2018, 01:19:48 PM »
All sound advice.  Thank you.

I will also note that hogdons pressures they noted with that load were a touch below 32k psi.

saami max for the 40 sw is 35k.
When people ignorant of guns make gun laws, you end up with ignorant gun laws.

Offline IDescribe

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Re: .40 TS load recipes
« Reply #19 on: March 10, 2018, 04:11:07 PM »
I will also note that hogdons pressures they noted with that load were a touch below 32k psi.

saami max for the 40 sw is 35k.

Right.

You should not read load data with the pressure for the max load falling significantly under SAAMI max to mean that you have a cushion.  You should read it to mean that .1gr more powder took it over SAAMI max, and that Wow, pressure is really climbing fast at the top of the charge window.  ;)

.40 S&W is known for dramatic pressure spikes with modest changes when running near or at max loads.  If this were 9mm, I'd say "Meh, he's probably in +P range, no big deal."  But with .40, there's no +P.  It's a much shorter trip from SAAMI max to a catastrophic failure with .40S&W.

Offline John A.

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Re: .40 TS load recipes
« Reply #20 on: March 10, 2018, 04:32:25 PM »
I agree.
When people ignorant of guns make gun laws, you end up with ignorant gun laws.