Has anyone tried N135 in 7mm08

[HuntClub]

using the 120 TTSX? Or even the 140 TTSX? Looking for information using QL or, better yet, experience. Thanks.

 

[Zero333]

I run N-130 with 120 TTSX and 100 X S...

Vihtavuori website has 7mm-08 data with N-135.

Rifle reloading data | Handloading | Rifle calibers | Centerfire Rifle bullets | Reload your own ammo - Vihtavuori

Vihtavuori offers rifle reloading data for numerous calibers and bullets for match and hunting purposes. Never exceed maximum loads.

www.vihtavuori.com

But I can run Quickload for the 140 TTSX and N-135.

This is MAX load according to QL.





This is with a 22" barrel...
140 TTSX
N-135

40 gr = MAX
105 % Case Fill
2,747 fps
2,343 ft-lbs Muzzle Energy
60,689 psi Chamber Pressure

Please START at 36 gr and work your way up accordingly. I found Quickload to be off by a bit or quite a bit sometimes.

According to my experience with N-130, I'd take a wild guess and say your optimal accuracy will be Near Max, around the 39 gr area.

 

[209jones]

2750 with a 140gr at a max load, not worth the time to load for my purposes, how they arrive at 100% plus fill is questionable in my mind, possibly due to TTSX length. It'll go bang though, 120gr TTSX may work a lot better with it, although 'd be more inclined to try n140 or Varget

 

[ATFIV]

IMR 4064 works very well with a 140 in a 7mm-08.
Hammers on the high end and will shoot well with lighter bullet and low pressure load

 

[Zero333]

2750 with a 140gr at a max load, not worth the time to load for my purposes, how they arrive at 100% plus fill is questionable in my mind, possibly due to TTSX length. It'll go bang though, 120gr TTSX may work a lot better with it, although 'd be more inclined to try n140 or Varget

22" barrel has a bit to do with the 2,750 fps.
My 7mm08 also has a 22" barrel and with 140 VLD hunt. & 139/140 BTSP bullets I get between 2,750 and 2,795 fps.

Add 25 fps for every extra inch of barrel. Thus a 26" barrel would get some of my 140 loads up to around 2,900 fps.

 

[Cloudchaser]

I have had very good accuracy and velocity using IMR4350 and Rx15 and 140g Accubonds

 

[209jones]

22" barrel has a bit to do with the 2,750 fps.
My 7mm08 also has a 22" barrel and with 140 VLD hunt. & 139/140 BTSP bullets I get between 2,750 and 2,795 fps.

Add 25 fps for every extra inch of barrel. Thus a 26" barrel would get some of my 140 loads up to around 2,900 fps.

26" would improve things, no doubt, I run 140 Partitions comfortably at 2850 in a 22", took it to 2900, backed off a grain, but, don't think the OP is looking at putting on a 26" for a youth hunting gun.

 

[Zero333]

I prefer lighter weight TTSX bullets. I have a deer load for one of my 300winmag's with 130 TTSX spitting it out at 3,500 fps (in the freezing cold) to 3,550 fps (in the summer temps) from a 24" boom stick. It works like a dream on deer. The higher velocity of the 130 ttsx wallops the deer dead where they stand.

Same thing goes for the 7mm/.284" 100 XS (no longer made ) and 120 TTSX in the 7mm08. The 100 gr Barnes XS works so good up close I will not use anything else for deer out to 200 yards.
I have just under 100 XS left, so enough for a handful of hunting trips. The 120 TTSX is for out to 400 yards. And that's my limit with distance. After I run out of the 100 XS I will start using the 110 TTSX for up close and out to 400 yards.
The 110 TTSX will be like killing 2 birds with 1 stone !

 

[HuntClub]

I prefer lighter weight TTSX bullets. I have a deer load for one of my 300winmag's with 130 TTSX spitting it out at 3,500 fps (in the freezing cold) to 3,550 fps (in the summer temps) from a 24" boom stick. It works like a dream on deer. The higher velocity of the 130 ttsx wallops the deer dead where they stand.

Same thing goes for the 7mm/.284" 100 XS (no longer made ) and 120 TTSX in the 7mm08. The 100 gr Barnes XS works so good up close I will not use anything else for deer out to 200 yards.
I have just under 100 XS left, so enough for a handful of hunting trips. The 120 TTSX is for out to 400 yards. And that's my limit with distance. After I run out of the 100 XS I will start using the 110 TTSX for up close and out to 400 yards.
The 110 TTSX will be like killing 2 birds with 1 stone !

I have been looking for the 110 TTSX for a long time now and have not found any in stock anywhere. Can you point me in the right direction on those?

 

[Laurie]

Please START at 36 gr and work your way up accordingly. I found Quickload to be off by a bit or quite a bit sometimes.

If you were using QL's default N135 powder settings here, I'll guarantee that it'll be 'quite a bit off'. Viht apparently comes up with 'over-slow' burn rate values for many of its powders from its 'closed bomb' lab testing reflected in both burn-rate charts and QL. N135 is one such.

In most cartridges it acts as a bit 'quicker' than H4895 in real life, not 'slower' as shown in charts including Viht's own. See:

http://www.targetshooter.co.uk/?p=3934

noting that testing was done in a long-freebore 223 FTR chamber allowing higher charges than in a SAAMI-spec chamber, and also how much QL V.3.9 under-calculates MVs, hence pressures. (My older v.3.6 was considerably worse in this respect.)

how they arrive at 100% plus fill is questionable in my mind, possibly due to TTSX length.

For a short-cut tubular powder, N135 has relatively low density, as well as the second lowest specific energy rating of any Viht rifle powder. It was developed specifically for the standard 7.62X51mm NATO ball loading with a short 144-147gn FMJBT bullet. IME, QL is usually accurate in predicting compressed loads with this powder. Having said that, R-P and Winchester 7-08 brass likely have slightly higher 'water overflow capacities' than the 55gn which is the default value in the model and probably based on Lapua brass.

 

[Zero333]

I have been looking for the 110 TTSX for a long time now and have not found any in stock anywhere. Can you point me in the right direction on those?

I have not been looking for the ,284/7mm 110 TTSX because I still have some of the old 100 XS and I also have 120 TTSX.

I'm in Canada so I wouldn't be much help. Nobody ships cross border.

 

[Zero333]

If you were using QL's default N135 powder settings here, I'll guarantee that it'll be 'quite a bit off'. Viht apparently comes up with 'over-slow' burn rate values for many of its powders from its 'closed bomb' lab testing reflected in both burn-rate charts and QL. N135 is one such.

In most cartridges it acts as a bit 'quicker' than H4895 in real life, not 'slower' as shown in charts including Viht's own. See:

http://www.targetshooter.co.uk/?p=3934

noting that testing was done in a long-freebore 223 FTR chamber allowing higher charges than in a SAAMI-spec chamber, and also how much QL V.3.9 under-calculates MVs, hence pressures. (My older v.3.6 was considerably worse in this respect.)




For a short-cut tubular powder, N135 has relatively low density, as well as the second lowest specific energy rating of any Viht rifle powder. It was developed specifically for the standard 7.62X51mm NATO ball loading with a short 144-147gn FMJBT bullet. IME, QL is usually accurate in predicting compressed loads with this powder. Having said that, R-P and Winchester 7-08 brass likely have slightly higher 'water overflow capacities' than the 55gn which is the default value in the model and probably based on Lapua brass.

Great info Laurie. Thank you kindly.