7mm and 7mm-08

The numbers I quote are from my chronograph.You are right, way off.Probably using it upside down. :d

Almost everybody else here is quoting software.

hoytcanon said:
You don't load for speed, but you quote the numbers...and your numbers are WAY off... and misleading in a conversation comparing the two cartridges.
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Kelly Timoffee said:
The numbers I quote are from my chronograph.You are right, way off.Probably using it upside down. :d

Almost everybody else here is quoting software.
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You stated the 7-08 loads were faster then book, and the 7RM were slower as a result of the "efficiency" of the cartridge design...
While that might be your experience with a single commercial barrel in each cartridge, it's not a universal truth in any sense. Small differences in chamber,throat,bore,twist,number of lands/grooves as well as brass,powder,primer etc, there are too many variables to list can impact MV. But the point is, that's 1 barrel with 1 load, stick it in a different rifle and you could lose 100-150fps in one, and gain 100-150fps in the other.
 
Not disagreeing at all.

What I am finding is that the differences between light bullet performance is less than expected than with heavier.

Get into 160+ the 08 won't give the push but when 140 and less , they become much closer than even I expected, stopping at the usual pressure signs in all cases during load development.I find with 150 grain bullets the difference is 150-200ft/sec , going above that the difference start to expand further.

Either way , under normal circumstance , both with take large animals up to and including moose and elk, that is the beauty of a slippery .284 projectile.

Hitzy said:
You stated the 7-08 loads were faster then book, and the 7RM were slower as a result of the "efficiency" of the cartridge design...
While that might be your experience with a single commercial barrel in each cartridge, it's not a universal truth in any sense. Small differences in chamber,throat,bore,twist,number of lands/grooves as well as brass,powder,primer etc, there are too many variables to list can impact MV. But the point is, that's 1 barrel with 1 load, stick it in a different rifle and you could lose 100-150fps in one, and gain 100-150fps in the other.
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This thread has been interesting, especially as I'm going to have my M70 EW 7-08 rebarreled and chambered to 284win. With a M70 short action, it will allow the C.O.L to be a little longer than 2.800. I'm going with a 24" barrel as well. Any thoughts?
 
Kelly.... with all due respect, performance on game wasn't the topic of discussion here....

The facts are that that (given the same 140 gr projectile), the 7 mag will easily launch it at 3300 fps plus while she he 7-08 will struggle to hit 2900 (I couldn't get it there with 3 powders)...... mind you I am fairly new to reloading.....

If you don't need a 400 yard rifle, then I think the 7-08 is pick of the two........ why waste powder and generate recoil for a 300 yard and less target if you don't have to?.... but, if you want to reach out past that or even be capable of launching heavier pills the 7 rm is the hands down winner.......

If you want to put it in terms of performance on game, the 7rm still wins because it can enjoy the same performance on game as the 7-08...... but from a different area code.......
 
Same respect being forwarded ,

Just looking back at some numbers here that I have recorded with 140's in 7/08 and 7RM , I do stand by my numbers.Not once did I achieve near those speeds in 7RM I stopped on the onset of pressure signs, also used various powders.I also looked on reloaders nest just to make sure I wasn't on too much moon shine.No published loads at 3400(others stated) , only one was at 3330, I am not doubting your numbers but I do know what I recorded but was starting to second guess my statements and recollections.

2900 ft/sec was easily obtainable in the 08 in three different rifles, 3150 in the RM seemed to be where I stopped in two other rifles(this is all I have documented that I can find).Maybe it has something to so with the central Saskatchewan air.

I just take offense to others, not you ,stating that I am not being truthful and saying my numbers are way off, I may be a lot of things but I am not a liar.

That being said , the loads settled on were not near max numbers , the only chambering where my most accurate load was at the top end and that is my 338LM, a bizarre beast in itself.





Superbrad said:
Kelly.... with all due respect, performance on game wasn't the topic of discussion here....

The facts are that that (given the same 140 gr projectile), the 7 mag will easily launch it at 3300 fps plus while she he 7-08 will struggle to hit 2900 (I couldn't get it there with 3 powders)...... mind you I am fairly new to reloading.....

If you don't need a 400 yard rifle, then I think the 7-08 is pick of the two........ why waste powder and generate recoil for a 300 yard and less target if you don't have to?.... but, if you want to reach out past that or even be capable of launching heavier pills the 7 rm is the hands down winner.......

If you want to put it in terms of performance on game, the 7rm still wins because it can enjoy the same performance on game as the 7-08...... but from a different area code.......
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pete dobinson said:
This thread has been interesting, especially as I'm going to have my M70 EW 7-08 rebarreled and chambered to 284win. With a M70 short action, it will allow the C.O.L to be a little longer than 2.800. I'm going with a 24" barrel as well. Any thoughts?
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I own & shoot both a 7-08Rem and a 284 Win Accuracy is the same - but the 284 Win will out FPS the 7-08 Rem by about 200 ! jmf RJ
 
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Hitzy said:
From my own experience, it's much easier to safely hit 3400fps with a 140gr pill in the 7RM then it is to hit 2900fps with the same bullet in the 7-08.
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I am 1.7gr over hodgdon min with 139gr ssts and get just over 2900 in one of my 7mm-08's the other rifle uses the same load and gets 2875 but I have taken it to less then .3gr from max and no pressure signs

john-brennan said:
I have both 7-08 140gr accubond 2935fps 7mm RM 140gr accubond 3300 no problem. you burn 20 plus grains of powder more.
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Ya it isn't all that difficult Hornady does 2950 in their factory superformance

Kelly Timoffee said:
2900 ft/sec was easily obtainable in the 08 in three different rifles,
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Same here. Not at a max load either.
 
I got 3050 fps through my chrony with hornady superformance with my m70 ew, with 139 gr bullets, it has a 22" barrel. Accuracy was terrible though. My chrony seems to be accurate with other rifles I have tested with it. I haven't matched that speed with my 284 win but it only has a 20" barrel.
 
pete dobinson said:
I got 3050 fps through my chrony with hornady superformance with my m70 ew, with 139 gr bullets, it has a 22" barrel. Accuracy was terrible though. My chrony seems to be accurate with other rifles I have tested with it. I haven't matched that speed with my 284 win but it only has a 20" barrel.
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Mine is the other way my 7-08 is 20 " and my 284 is 22 " ! RJ
 
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