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Author Topic: 2 different loads  (Read 356 times)

Offline yari

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2 different loads
« on: October 06, 2019, 09:34:38 PM »
my buddy loaded me 2 different rounds. both are Hornady 168 gr a-max w/ federal 215 primers. one is loaded w/ 76 gr Rel22 powder, the other w/ 67.5 gr IMR 4350

based on my shooting this weekend, I think his ft/sec estimates are low. does anyone have a program to calculate ft/sec?

just to get unbiased input, I would give his estimates. based on what I see on different sites, he does appear conservative

thoughts?
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2 different loads
« on: October 06, 2019, 09:34:38 PM »
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Offline Madgomer

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Re: 2 different loads
« Reply #1 on: October 06, 2019, 11:08:33 PM »
Yari, is this for your .300?  What barrel length are you running with?
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Offline Dutch-Hunter

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Re: 2 different loads
« Reply #2 on: October 07, 2019, 04:52:40 AM »
Assuming based on load stats you listed it is for your 300WM. 24" barrel estimated velocities would be best guess IMR4350 3035 and RL22 3150.
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Offline yari

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Re: 2 different loads
« Reply #3 on: October 07, 2019, 09:49:55 AM »
26" barrel i believe. browning stainless stalker a-bolt .300 win mag
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Offline Madgomer

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Re: 2 different loads
« Reply #4 on: October 07, 2019, 10:55:34 AM »
Yari - I'll defer to the wisdom of DH for credible estimates on the muzzle velocity.  His response this morning is in the ballpark of what I was seeing with a couple of my favorite on-line sites.

You mentioned he loaded the A-max bullet though - I was under the impression that was a thin jacket bullet intended more for paper punching than hunting.  Are you planning to use that one on deer?  If so, penetration might be a concern (it should dump all of its energy in the animal but if you like pass-thru shots it may not be your best option).
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Offline yari

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Re: 2 different loads
« Reply #5 on: October 07, 2019, 12:36:44 PM »
Yari - I'll defer to the wisdom of DH for credible estimates on the muzzle velocity.  His response this morning is in the ballpark of what I was seeing with a couple of my favorite on-line sites.

You mentioned he loaded the A-max bullet though - I was under the impression that was a thin jacket bullet intended more for paper punching than hunting.  Are you planning to use that one on deer?  If so, penetration might be a concern (it should dump all of its energy in the animal but if you like pass-thru shots it may not be your best option).

I don't know why he picked this load. he made me 4 boxes. I've read several reports on this load and you are right. all energy is left in the animal. around here, that will be a benefit as I don't want stray bullets passing through. the one deer I shot in SD went straight down at 280yrds. definitely not using for anything bigger than deer
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Offline Madgomer

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Re: 2 different loads
« Reply #6 on: October 07, 2019, 12:39:47 PM »
Yari - I'll defer to the wisdom of DH for credible estimates on the muzzle velocity.  His response this morning is in the ballpark of what I was seeing with a couple of my favorite on-line sites.

You mentioned he loaded the A-max bullet though - I was under the impression that was a thin jacket bullet intended more for paper punching than hunting.  Are you planning to use that one on deer?  If so, penetration might be a concern (it should dump all of its energy in the animal but if you like pass-thru shots it may not be your best option).

I don't know why he picked this load. he made me 4 boxes. I've read several reports on this load and you are right. all energy is left in the animal. around here, that will be a benefit as I don't want stray bullets passing through. the one deer I shot in SD went straight down at 280yrds. definitely not using for anything bigger than deer
Dumping all of the energy from a .300 Win mag at 300 yards would be enough to knock down most any whitetail/muley I expect, probably makes a pretty significant mess of the boiler room.
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Offline yari

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Re: 2 different loads
« Reply #7 on: October 07, 2019, 02:24:54 PM »
Yari - I'll defer to the wisdom of DH for credible estimates on the muzzle velocity.  His response this morning is in the ballpark of what I was seeing with a couple of my favorite on-line sites.

You mentioned he loaded the A-max bullet though - I was under the impression that was a thin jacket bullet intended more for paper punching than hunting.  Are you planning to use that one on deer?  If so, penetration might be a concern (it should dump all of its energy in the animal but if you like pass-thru shots it may not be your best option).

yes it did

how much difference in ft/sec will the 26" vs the 24" barrel DH referenced? any idea?

I don't know why he picked this load. he made me 4 boxes. I've read several reports on this load and you are right. all energy is left in the animal. around here, that will be a benefit as I don't want stray bullets passing through. the one deer I shot in SD went straight down at 280yrds. definitely not using for anything bigger than deer
Dumping all of the energy from a .300 Win mag at 300 yards would be enough to knock down most any whitetail/muley I expect, probably makes a pretty significant mess of the boiler room.
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Offline Madgomer

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Re: 2 different loads
« Reply #8 on: October 07, 2019, 02:41:50 PM »
At some point additional length won't translate into additional velocity, but this article suggests you might get an extra 60-80 fps with a 26 over a 24" barrel.
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Offline yari

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Re: 2 different loads
« Reply #9 on: October 07, 2019, 04:52:57 PM »
At some point additional length won't translate into additional velocity, but this article suggests you might get an extra 60-80 fps with a 26 over a 24" barrel.

that's getting closer to my shooting results. I had a 3 shot group of 3/4"  at 100yrds 2" high. I went to 300 yrds w/ 3" group only dropping 4-5" total. that's still a smaller drop than 3200fps dictates, but closer than my buddies estimate would dictate
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Offline Madgomer

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Re: 2 different loads
« Reply #10 on: October 07, 2019, 07:18:14 PM »
Sorry Yari, forgot to attach a link to the article I was quoting.  I just looked at the slope of the line in their graph of velocity vs. length as they chopped the barrel to get the 60-80 fps estimate. 

https://rifleshooter.com/2013/12/300-winchester-magnum-how-does-barrel-length-change-velocity-a-16-300-win-mag/
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Offline yari

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Re: 2 different loads
« Reply #11 on: October 07, 2019, 09:38:05 PM »
that's funny mad. after you forgot to post it, I did a search and found the exact article and a few others. it seems like 30-35' per second per inch is the common response.

thx
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Offline Madgomer

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Re: 2 different loads
« Reply #12 on: October 07, 2019, 10:36:53 PM »
I had always heard the old rule of thumb was 40 fps per inch but there are so many variables that can influence it that you really need to find some caliber specific data to get a credible estimate for your situation.
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Offline Dutch-Hunter

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Re: 2 different loads
« Reply #13 on: October 08, 2019, 06:01:42 AM »
The length of the barrel is only one factor in velocity. Bore condition is another as well as jump space. Each of the 2 loads will generate different harmonics thus will perform slightly different. Using a chronny is the only way of determining actual velocity. The velocities I guessed at were from past experience and data. You are both correct each additional inch of barrel length will result in 30-50 additional fps in velocity. This is only a best guess but is usually pretty close.

Point blank zero will be between 223 and and 228 yards. Again this is a best guess estimate.

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