Whisky Creek
Member
- Location
- Yukon, Canada
Howdy, Would someone who has this "quickload" I hear ya'll talking about run a couple loads for me to tell me what the expected pressures might be, and if it is still safe?
I'm reloading for a .257 Wby, Mark V.
115 gr Nosler ballistic tip,
RL 25 - 73.0 grains (3400 fps???)
75 gr Hornady V-Max
RL 19 - 76.1 grains b (4000 fps???)
My Hornady manual doesn't have a 115, only a 117. It shows the max load as being 70.9 grains to produce about 3300 fps. (Weatherby/Norma runs this bullet out at 3402). The 75 grain v-max max load in the same hornady manual is listed at 72.7 to get about 3800 fps. It looks like it takes about 1.7 grains of additional powder to produce an extra 1000 fps from 3300 all the way up to 3800, so in theory an extra 3.4 grains over the listed max of 72.7 grains should produce about 4000 fps...... This is where I've heard a number of guys are running with the 75 grain bullet, BUT, what are the pressures like. Due to the length of the bullet there will be a lot of freebore to get it going. Even with the 115 grain, I'm really restricted to the magazine length and can get a C.O.L. of 3.300 inches, whereas the Nosler manual says C.O.L. to be 3.250 and the Hornady manual says 3.170
My intention is to get the most out of this cartridge for accuracy and hunting applications, BUT, also keep it perfectly safe and keep a decent barrel life. Looking for valid opinions and someone with that "Quickload" to check those pressures for me.
Thanks,
CLINT
Edit PS: Confusing data in two newer loading manuals also. Listed below are a few powders, and then followed by what Hornady says the max load is and then what Nosler says is the max load for the same bullet weight (100 grain).
AA3100 66.8 68.0
H4831 62.4 68.0
VIHT-N160 61.7 65.0
IMR 4350 58.5 64.0
IN all cases the Hornady manual is quite conservative, an in some cases rediculously conservative, compared to the Nosler manual. Differences of 200 feet per second in most cases are projected and / or observed. Which is a guy to follow and why is there such as difference? I understand that one needs to work up to max loads, checking for pressure signs, but it makes no sense to me why two reputable outfits can be so far apart in their numbers... Nosler's manual doesn't have a listing for RL25 and the 115 gr bullet. Is there a powder that is very comparable to it that a fella could use as a comparison starting point, grain for grain? They have listed imr4350, imr4831, aa3100, vihtni65, imr7828, and h870.
Last question, How many questions can one guy fit into one post?
I'm reloading for a .257 Wby, Mark V.
115 gr Nosler ballistic tip,
RL 25 - 73.0 grains (3400 fps???)
75 gr Hornady V-Max
RL 19 - 76.1 grains b (4000 fps???)
My Hornady manual doesn't have a 115, only a 117. It shows the max load as being 70.9 grains to produce about 3300 fps. (Weatherby/Norma runs this bullet out at 3402). The 75 grain v-max max load in the same hornady manual is listed at 72.7 to get about 3800 fps. It looks like it takes about 1.7 grains of additional powder to produce an extra 1000 fps from 3300 all the way up to 3800, so in theory an extra 3.4 grains over the listed max of 72.7 grains should produce about 4000 fps...... This is where I've heard a number of guys are running with the 75 grain bullet, BUT, what are the pressures like. Due to the length of the bullet there will be a lot of freebore to get it going. Even with the 115 grain, I'm really restricted to the magazine length and can get a C.O.L. of 3.300 inches, whereas the Nosler manual says C.O.L. to be 3.250 and the Hornady manual says 3.170
My intention is to get the most out of this cartridge for accuracy and hunting applications, BUT, also keep it perfectly safe and keep a decent barrel life. Looking for valid opinions and someone with that "Quickload" to check those pressures for me.
Thanks,
CLINT
Edit PS: Confusing data in two newer loading manuals also. Listed below are a few powders, and then followed by what Hornady says the max load is and then what Nosler says is the max load for the same bullet weight (100 grain).
AA3100 66.8 68.0
H4831 62.4 68.0
VIHT-N160 61.7 65.0
IMR 4350 58.5 64.0
IN all cases the Hornady manual is quite conservative, an in some cases rediculously conservative, compared to the Nosler manual. Differences of 200 feet per second in most cases are projected and / or observed. Which is a guy to follow and why is there such as difference? I understand that one needs to work up to max loads, checking for pressure signs, but it makes no sense to me why two reputable outfits can be so far apart in their numbers... Nosler's manual doesn't have a listing for RL25 and the 115 gr bullet. Is there a powder that is very comparable to it that a fella could use as a comparison starting point, grain for grain? They have listed imr4350, imr4831, aa3100, vihtni65, imr7828, and h870.
Last question, How many questions can one guy fit into one post?
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