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308 with Ramshot Big Game

Budget'06

Budget'06

Well-Known Member
Joined
Jan 12, 2024
Messages
139
Location
Upstate NY
Hey all, I was looking at loading up some 308 hunting loads for a friends Model 70. I was looking at the Nosler manual and noticed Big Game was listed with a Max of 52.5 grains with a 168gr bullet.

When running the load through GRT it came back as roughly 85k PSI for 50.5gr of Big Game and a 168gr TMK. How could this moderate load from the book be that high pressure according to GRT? anyone have any experience with a similar load?
 
case capacity per nosler's input. knowing what nosler used (probably their brass h2o capacity) when they did quick load results. i find this the same when using ql also from other published load data.

i haven't loaded any 7-08rem or 308win yet with either hunter or big game, so no info there.

i've foung (according to ql) that some published data for my 264wm hit 80k at times. throat length can make a difference on pressures (someone might say different), but i've checked using the same ammo w/same lot numbers in multiple firearms to reach that conclusion.
 
I am only at about 47.5 grain of BG with 140's in my 7-08.
The 308/168 load of 52 grains is at 111% case fill which is quite compressed unless you can load them long.
I have had good results with BG and I like to run ball powder slightly compressed if the rifle likes it, but you should definitely start low.
Although I don't use any fancy apps.
 
birddog 68 said:
I am only at about 47.5 grain of BG with 140's in my 7-08.
The 308/168 load of 52 grains is at 111% case fill which is quite compressed unless you can load them long.
I have had good results with BG and I like to run ball powder slightly compressed if the rifle likes it, but you should definitely start low.
Although I don't use any fancy apps.
Click to expand...
I don't even know what a fancy app is
 
1) Software programs are mathematical models.
2) Websites are subject to "typos".
3) Hodgdon's website shows a max load of BigGame for a 165 is 51.0 compressed but is only 51.6K PSI but GRT is telling you that 50.5 for a 165 is 85K PSI. (see point 1)

Data varies in the reloading world all the time.

If you are trying to achieve accuracy at a reasonable velocity and do it safely, Start at 45.5 load up a couple of rounds each in .5 increments to 47.5 looking for pressure and then run the OCW protocol using .4 increments stopping at 51.0 looking for pressure signs. 50 to 75 fps ain't going to matter.
 
I am not sure if GRT works for some loads/cartridges but I never got it to work for anything I tried with 270. Similar results as the OP. Something that should have been a fairly mild load was supposedly "dangerous". I jacked around with the other parameters trying to align it with reality then finally gave up.

It is free... to me I got what I paid for.
 
ARlife4me said:
if you have enough known info, then it is predictable
Click to expand...
Therein lies the rub. You dont know. A powder burns differently in different cartridges, case capacities, calibers etc. Custom chambers, throats,etc add a whole new dimension. We could go on all day. I have a number of powder models of the same powder calibrated for my cartridges. I was on the powder development team working with Charlie and Gordon on several powders and can tell you that since Gordon's passing and the shutting down of GRT labs you had better calibrate the powder models because they are far out of date.
 

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