RL-22 and IMR4831 For the .257 Weatherby

jsr76 · September 17, 2008, 07:20 PM

I am trying to work up loads for my .257 Weatherby using IMR4831 and RL-22. The bullets are the Barnes 100 grain TSX and the Hornady 100 grain soft point. I don't have manuals for either bullet so any help would be awesome. Thanks.

**Unclenick** · September 18, 2008, 01:48 PM

I don't have data on the Barnes bullet.

The Hornady manual says to seat their 100 grain SP to 3.075" COL in the 240 Weatherby. In a Weatherby brand case, their listed IMR 4831 starting load is 44.5 grains, and their listed maximum is 49.3 grains. Your cases and gun may be different.

They list RL-19 as having a starting load of 44.3 grains and a maximum at 48.6 grains, and they list RL-25 with a starting load of 52.4 grains and a maximum of 56.9 grains. Obviously RL-22 will be somewhere in between, but is not listed.

QuickLOAD shows the RL-19 and RL-25 starting loads generating about 39 KPSI and 48 KPSI, respectively. If we split the difference and plug in RL-22, we get 43.5 KPSI, and QuickLOAD predicts 48.4 grains of RL-22 will generate that pressure in a SAMMI minimum chamber. So, that is likely a good starting load. You will want to work up carefully from there, watching for pressure signs.

jde650 · September 18, 2008, 05:24 PM

My barnes reloading manual shows starting load of 61.0 grains for 100 grain xbt and starting load for Rl22 of 67.0 grains, same bullet

jsr76 · September 18, 2008, 08:30 PM

I don't want to sound ungrateful but Unclenick, I'm looking for the .257 Weatherby, not .240 Weatherby. Also I can't quite decipher the last post. What are the 61 and 67 grain loadings, Sir. Are they starting and max for the mentioned bullet with RL-22? Does you're manual list the TSX? Thanks for helping either way. The TSX is hard to find info for. I could start with the low end of you're charges and work up from there until max. I appreciate any help. Maybe someday I can return the favor. I also know a few things.

jde650 · September 19, 2008, 12:24 AM

Imr 4931 Starting Max
100 Gr Xbt 61.0 Grs 66.0 Grs

Rl22
100 Gr Xbt 67.0 Grs 72.0 Grs

From Barnes Reloading Manual No. 2

**Unclenick** · September 19, 2008, 11:14 AM

jsr76,

Sorry, my mind must have passed gas between reading and composing the post (which I did offline). I guess you'll just have to buy an additional rifle.

For the .257 Weatherby Magnum, the Hornady book puts the 100 grain .257 soft point in a Weatherby brand case and using a Federal 215 primer at a COL of 3.185" as:

IMR 4831:
Starting Load: 53.5 grains
Maximum Load: 62.4 grains

RL-22:
Starting Load: 59.9 grains
Maximum Load: 67.3 grains

jde650,

Does the Barnes manual have COL and primer and case brand listed?

September 17, 2008, 07:20 PM	#1
jsr76 Junior member Join Date: April 7, 2007 Location: New York State, up north Posts: 274	RL-22 and IMR4831 For the .257 Weatherby I am trying to work up loads for my .257 Weatherby using IMR4831 and RL-22. The bullets are the Barnes 100 grain TSX and the Hornady 100 grain soft point. I don't have manuals for either bullet so any help would be awesome. Thanks.

September 18, 2008, 01:48 PM	#2
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,063	I don't have data on the Barnes bullet. The Hornady manual says to seat their 100 grain SP to 3.075" COL in the 240 Weatherby. In a Weatherby brand case, their listed IMR 4831 starting load is 44.5 grains, and their listed maximum is 49.3 grains. Your cases and gun may be different. They list RL-19 as having a starting load of 44.3 grains and a maximum at 48.6 grains, and they list RL-25 with a starting load of 52.4 grains and a maximum of 56.9 grains. Obviously RL-22 will be somewhere in between, but is not listed. QuickLOAD shows the RL-19 and RL-25 starting loads generating about 39 KPSI and 48 KPSI, respectively. If we split the difference and plug in RL-22, we get 43.5 KPSI, and QuickLOAD predicts 48.4 grains of RL-22 will generate that pressure in a SAMMI minimum chamber. So, that is likely a good starting load. You will want to work up carefully from there, watching for pressure signs. __________________ Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle

September 18, 2008, 05:24 PM	#3
jde650 Member Join Date: August 24, 2008 Posts: 24	257 weatherby loads for 100 grain My barnes reloading manual shows starting load of 61.0 grains for 100 grain xbt and starting load for Rl22 of 67.0 grains, same bullet

September 19, 2008, 11:14 AM	#6
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,063	jsr76, Sorry, my mind must have passed gas between reading and composing the post (which I did offline). I guess you'll just have to buy an additional rifle. For the .257 Weatherby Magnum, the Hornady book puts the 100 grain .257 soft point in a Weatherby brand case and using a Federal 215 primer at a COL of 3.185" as: IMR 4831: Starting Load: 53.5 grains Maximum Load: 62.4 grains RL-22: Starting Load: 59.9 grains Maximum Load: 67.3 grains jde650, Does the Barnes manual have COL and primer and case brand listed? __________________ Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle

September 18, 2008, 08:30 PM	#4
jsr76 Junior member Join Date: April 7, 2007 Location: New York State, up north Posts: 274	I don't want to sound ungrateful but Unclenick, I'm looking for the .257 Weatherby, not .240 Weatherby. Also I can't quite decipher the last post. What are the 61 and 67 grain loadings, Sir. Are they starting and max for the mentioned bullet with RL-22? Does you're manual list the TSX? Thanks for helping either way. The TSX is hard to find info for. I could start with the low end of you're charges and work up from there until max. I appreciate any help. Maybe someday I can return the favor. I also know a few things.

September 19, 2008, 12:24 AM	#5
jde650 Member Join Date: August 24, 2008 Posts: 24	Imr 4931 Starting Max 100 Gr Xbt 61.0 Grs 66.0 Grs Rl22 100 Gr Xbt 67.0 Grs 72.0 Grs From Barnes Reloading Manual No. 2